• A Lagrangian–Eulerian procedure for the coupled solution of the Navier–Stokes and shallow water equations for landslide-generated waves

    Advanced Modeling and Simulation in Engineering Sciences (2022). Vol. 9(1), Article 15, 2022

    Abstract
    This work presents a partitioned method for landslide-generated wave events. The proposed strategy combines a Lagrangian Navier Stokes multi-fluid solver with an Eulerian [...]

  • A unified non-linear energy dissipation-based plastic-damage model for cyclic loading

    Computer Methods in Applied Mechanics and Engineering (2022). Vol. 400,115543

    Abstract
    A new energy-dissipation-based rate-independent constitutive law within the framework of elastoplasticity coupled with damage is proposed. With this methodology, the inelastic [...]

  • Explicit time integration scheme with large time steps for first order transient problems using finite increment calculus (preprint)

    Computer Methods in Applied Mechanics and Engineering (2022). Available online 14 July, 115332

    Abstract
    We present an explicit integration scheme for solving the transient heat conduction equation that allows larger time steps than the standard forward Euler scheme. The derivation [...]

  • Structural analysis and design of a large inflatable hangar for aircrafts (preprint)

    J. Gonzalez, J. Marcipar, C. Estruch, E. Oñate
    Structural Engineering International (2022). pp. 1-5

    Abstract
    Buildair S.A. has recently designed, manufactured and built an inflatable hangar (termed H75 hangar) for the aeronautic industry in Jeddah Airport (Kingdom of Saudi Arabia). [...]

  • Efficient aeroelastic analysis of inflatable structures using enhanced potential flow aerodynamics

    Journal of Fluids and Structures (2019). Vol. 90, pp. 230-245

    Abstract
    An efficient method for the aeroelastic analysis of wind effects on inflatable structures is presented. The solution scheme is staggered and uses an explicit finite-element [...]

  • Computation of the stabilization parameter for the finite element solution of advective–diffusive problems

    Int. J. for Num. Meths. in Fluids (1997). Vol. 25, pp. 1387-1407

    Abstract
    In a previous paper a general procedure for deriving stabilized finite element schemes for advective type problems based on invoking higher order balance laws over finite [...]

  • Lagrangian formulation for finite element analysis of quasi-incompressible fluids with reduced mass losses

    Int. J. for Numerical Methods in Fluids (2014). Vol. 74 pp. 699-731 Vol. 74 pp. 699-731 (preprint)

    Abstract
    We present a Lagrangian formulation for finite element analysis of quasi-incompressible fluids that has excellent mass preservation features. The success of the formulation [...]

  • Accurate modelling of the elastic behavior a continuum with the Discrete Element Method

    M. Celigueta, S. Latorre, F. Arrufat, E. Oñate
    Computational Mechanics (2017). (prepint) Vol. 60 (6), pp. 997-1010

    Abstract
    The Discrete Element Method (DEM) has been used for modeling continua, like concrete or rocks. However, it requires a big calibration effort, even to capture just the linear [...]

  • Accurate FIC-FEM formulation for the multidimensional steady-state advection diffusion–absorption equation

    E. Oñate, P. Nadukandi, J. Miquel
    Comput. Methods Appl. Mech. Engrg., (2017). Vol. 327, pp. 352-368

    Abstract
    In this paper we present an accurate stabilized FIC-FEM formulation for the multidimensional steady-state advection-diffusion-absorption equation. The stabilized formulation [...]

  • Finite increment calculus (FIC). A framework for deriving enhanced computational methods in mechanics

    Adv. Model. and Simul. in Eng. Sci (2016). Vol. 3 pp. 14 Vol. 3 (14)

    Abstract
    In this paper we present an overview of the possibilities of the finite increment calculus (FIC) approach for deriving computational methods in mechanics with improved numerical [...]

  • Unified Lagrangian formulation for solid and fluid mechanics and FSI problems

    Comput. Methods Appl. Mech. Engrg. (2016). Vol. 107(11) pp. 970-990 (preprint) Vol. 298, pp. 520-547

    Abstract
    We present a Lagrangian monolithic strategy for solving fluid-structure interaction (FSI) problems. The formulation is called Unified because fluids and solids are solved [...]

  • A FEM-DEM technique for studying the motion of particles in non-Newtonian fluids. Application to the transport of drill cuttings in wellbores

    M. Celigueta, K. Deshpande, S. Latorre, E. Oñate
    Comp. Part. Mech (2016). Vol. 3(2) pp. 263-276 (preprint)

    Abstract
    We present a procedure for coupling the finite element method (FEM) and the discrete element method (DEM) for analysis of the motion of particles in non-Newtonian fluids. [...]

  • An accurate FIC-FEM formulation for the 1D advection-diffusion-reaction equation

    Computer Methods in Applied Mechanics and Engineering (2016). Vol. 298() pp. 373-406

    Abstract
    In this paper we present an accurate stabilized FIC-FEM formulation for the 1D advection-diffusion-reaction equation in the exponential and propagation regimes using two stabilization [...]

  • Application of an enhanced discrete element method to oil and gas drilling processes

    P. Ubach, F. Arrufat, L. Ring, R. Gandikota, F. Zárate, E. Oñate
    Comp. Part. Mech (2016). Vol. 3(1) pp. 39-4 (preprint)

    Abstract
    The authors present results on the use of the discrete element method (DEM) for the simulation of drilling processes typical in the oil and gas exploration industry. The numerical [...]

  • A simple FEM-DEM technique for fracture prediction in materials and structures

    F. Zárate, E. Oñate
    Comp. Part. Mech (2015). Vol. 2(3) pp. 301-314 (preprint)

    Abstract
    This paper presents a new computational technique for predicting the onset and evolution of fracture in a continuum in a simple manner combining the finite element method [...]

  • Adjoint-based adaptive finite element method for the compressible Euler equations using finite calculus

    M. Kouhi, E. Oñate, D. Mavriplis
    Aerospace Science and Technology (2014). Vol. 46 pp. 422-435

    Abstract
    In this paper, an adjoint-based error estimation and mesh adaptation framework is developed for the compressible inviscid flows. The algorithm employs the Finite Calculus [...]

  • On the effect of the bulk tangent matrix in partitioned solution schemes for nearly incompressible fluids

    A. Franci, E. Oñate, J. Carbonell
    Int. J. Numer. Meth. Engng. (2015). Vol. 102(3-4) pp. 257-277

    Abstract
    The purpose of this paper is to study the effect of the bulk modulus in the iterative matrix for the analysis of quasi-incompressible free surface fluid flows using a mixed [...]

  • An implicit stabilized finite element method for the compressible Navier–Stokes equations using finite calculus

    M. Kouhi, E. Oñate
    Computational Mechanics (2015). Vol. 56(1) pp. 113-129

    Abstract
    A new implicit stabilized formulation for the numerical solution of the compressible NavierStokes equations is presented. The method is based on the Finite Calculus (FIC) [...]

  • A local constitutive model for the discrete element method. Application to geomaterials and concrete

    E. Oñate, F. Zárate, J. Miquel, M. Santasusana, M. Celigueta, F. Arrufat, R. Gandikota, K. Valiullin, L. Ring
    Computational Particle Mechanics (2015). Vol. 2(2) pp. 139-160

    Abstract
    This paper presents a local constitutive model for modelling the linear and non linear behavior of soft and hard cohesive materials with the discrete element method (DEM). [...]

  • Lagrangian analysis of multiscale particulate flows with the particle finite element method

    E. Oñate, M. Celigueta, S. Latorre, G. Casas, R. Rossi, J. Rojek
    Comp. Part. Mech (2014). Vol. 1 pp. 85-102 (prepint) Vol. 1 pp. 85-102

    Abstract
    We present a Lagrangian numerical technique for the analysis of flows incorporating physical particles of different sizes. The numerical approach is based on the Particle [...]

  • Particle Finite Element Method (PFEM) for analysis of industrial forming processes

    Computational Mechanics (2014). Vol. 54 pp. 85-107

    Abstract
    We present a generalized Lagrangian formulation for analysis of industrial forming processes involving thermally coupled interactions between deformable continua. The governing [...]

  • Simple and efficient numerical tools for the analysis of parachutes

    R. Flores, E. Ortega, E. Oñate
    Engineering Computations (2014). Vol. 31(5) pp. 957-985

    Abstract
    This work describes a set of simple yet effective, numerical method for the design and evaluation of parachute-payload system. The developments include a coupled fluidstructural [...]

  • A stabilized finite element formulation for high‐speed inviscid compressible flows using finite calculus

    M. Kouhi, E. Oñate
    Int. J. Numer. Meth. Engng. (2014). Vol. 74(2) pp. 872-897

    Abstract
    This paper aims at the development of a new stabilization formulation based on the Finite Calculus (FIC) scheme for solving the Euler equations using the Galerkin finite element [...]

  • A plastic-damage model for concrete

    J. Lubliner, J. Oliver, S. Oller, E. Oñate
    Int. J. Solids and Structures (1989). Vol. 25 (3), pp. 299-326

    Abstract
    In this paper a constitutive model based on an internal variable-formulation of plasticity theory for the non-linear analysis of concrete is presented. The model uses a new [...]

  • Ensayos experimentales y numéricos de rotura en piezas de hormigón. Hacia el Laboratorio Virtual

    F. Zarate, A. Gomez, E. Oñate
    Rev. int. métodos numér. cálc. diseño ing. (2019). Vol. 35, (1), 14

    Abstract
    This paper describes a computation methodology to evaluate the ultimate strength and fracture of concrete samples and structures and its application to four typical tests [...]

  • A FEM fluid-structure interaction algorithm for analysis of the seal dynamics of a Surface-Effect Ship

    Comp. Meth. App. Mech. Eng. (2015). 295, 290-304 (preprint)

    Abstract
    This paper shows the recent work of the authors in the development of a time-domain FEM model for evaluation of the seal dynamics of a surface effect ship. The fluid solver [...]

  • Surface tension problems solved with the Particle Finite Element Method using large time-steps

    J. Giménez, N. Nigro, S. Idelsohn, E. Oñate
    Computers and Fluids (2016). (preprint) Vol. 141, pp. 90-104

    Abstract
    In previous works [1,2], the authors have presented a highly efficient extension of the Particle Finite Element Method, called PFEM-2, to solve two-phase flows. The methodology [...]

  • Finite volume for stress analysis upon polygonal, unstructured and non conforming meshes

    Rev. int. métodos numér. cálc. diseño ing. (2019). Vol. 35, (4), 47

    Abstract
    Within this paper we discuss a numerical strategy to solve the elasticity problem upon unstructured and non conforming meshes, allowing all kinds of flat-faced elements (polygons [...]

  • Advances in the particle finite element method for the analysis of fluid-multibody interaction and bed erosion in free surface flows

    Comput. Methods Appl. Mech. Engrg., (2008). Vol. 197 (19-20), pp. 1777–1800

    Abstract
    We present some advances in the formulation of the Particle Finite Element Method (PFEM) for solving complex fluid-structure interaction problems with free surface waves. [...]

  • Interpretation of dam deformation and leakage with boosted regression trees

    Engineering Structures (2016). (Preprint) Vol. 119, pp. 230-251

    Abstract
    Predictive models are essential in dam safety assessment. They have been traditionally based on simple statistical tools such as the hydrostatic-season-time (HST) model. These [...]

  • Lagrangian versus Eulerian integration errors

    S. Idelsohn, E. Oñate, N. Nigro, P. Becker
    Comput. Methods Appl. Mech. Engrg., (2015). Vol. 293, pp. 191–206; (preprint)

    Abstract
    The possibility to use a Lagrangian frame to solve problems with large time-steps was successfully explored previously by the authors for the solution of homogeneous incompressible [...]

  • Combination of discrete element and finite element methods for dynamic analysis of geomechanics problems

    E. Oñate, J. Rojek
    Comput. Methods Appl. Mech. Engrg., (2004). Vol 193, 3087-3128

    Abstract
    The paper presents combination of Discrete Element Method (DEM) and Finite Element Method (FEM) for dynamic analysis of geomechanics problems. Combined models can employ spherical [...]

  • Simple and accurate two-noded beam element for composite laminated beams using a refined zigzag theory

    E. Oñate, A. Eijo, S. Oller
    Comput. Methods Appl. Mech. Engrg., (2012). Vol. 213–216, pp. 362–382

    Abstract
    In this work we present a new simple linear two-noded beam element adequate for the analysis of composite laminated and sandwich beams based on the combination of classical [...]

  • The particle finite element method. An overview

    International Journal of Computational Methods (2004). Vol. 1 (2), pp. 267-307

    Abstract
    We present a general formulation for analysis of fluid-structure interaction problems using the particle finite element method (PFEM). The key feature of the PFEM is the use [...]

  • Improvements in the membrane behaviour of the three node rotation-free BST shell triangle using an assumed strain approach

    F. Flores, E. Oñate
    Comput. Methods Appl. Mech. Engrg., (2005). Vol. 194, pp. 907-932

    Abstract
    In this paper an assumed strain approach is presented in order to improve the membrane behaviour of a thin shell triangular element. The so called Basic Shell Triangle (BST) [...]

  • Modelación numérica de deslizamientos de ladera en embalses mediante el Método de Partículas y Elementos Finitos (PFEM)

    F. Salazar, E. Oñate, R. Morán
    Rev. int. métodos numér. cálc. diseño ing. (2012). Vol. 28, (2)

    Abstract
    The paper presents the results of the application of the Particle Finite Element Method (PFEM) to the analysis of landslides in reservoirs. This is a complex phenomenon, because [...]

  • Extended rotation-free plate and beam elements with shear deformation effects

    E. Oñate, F. Zárate
    Int. J. Numer. Meth. Engng. (2010). Vol. 83 (2), pp.196-227

    Abstract
    The paper describes a methodology for extending rotation-free plate and beam elements in order to accounting for transverse shear deformation effects. The ingredients for [...]

  • Combination of an adaptive remeshing technique with a coupled FEM-DEM approach for analysis of crack propagation problems (preprint)

    A. Cornejo, V. Mataix, F. Zarate, E. Oñate
    Computational Particle Mechanics (2020). Vol. 7, pp. 735–752, doi: 10.1007/s40571-019-00306-4

    Abstract
    This paper presents an enhanced coupled approach between the Finite Element Method (FEM) and the Discrete Element Method (DEM) in which an adaptative remeshing technique has [...]

  • Unified Lagrangian formulation for elastic solids and incompressible fluids. application to fluid-structure interaction problems via the PFEM

    S. Idelsohn, J. Marti, A. Limache, E. Oñate
    Comput. Methods Appl. Mech. Engrg., (2008). Vol. 197, pp. 1762–1776

    Abstract
    We present a general Lagrangian formulation for treating elastic solids and quasi/fully incompressible fluids in a unified form. The formulation allows to treat solid and [...]

  • A three dimensional FEM-DEM technique for predicting the evolution of fracture in geomaterials and concrete

    Comp. Part. Mech (2018). (prepint) Vol. 5 (3) , pp. 411-420

    Abstract
    This paper extends to three dimensions (3D) the computational technique developed by the authors in 2D for predicting the onset and evolution of fracture in a finite element [...]

  • A finite point method in computational mechancis. Applications to convective transport and fluid flow.

    E. Oñate, S. Idelsohn, O. Zienkiewicz, R. Taylor
    Int. J. Numer. Meth. Engng. (1996). Vol. 39 (22), pp. 3839-3866

    Abstract
    The paper presents a fully meshless procedure fo solving partial differential equations. The approach termed generically the ‘finite point method’ is based on [...]

  • Formulación de elementos finitos para vigas de sección abierta formadas por laminados compuestos incluyendo las deformaciones tangenciales por cortante y torsión

    P. Vargas, E. Oñate, S. Oller
    Rev. int. métodos numér. cálc. diseño ing. (2014). Vol. 30, (4)

    Abstract
    In this paper we derive the field of displacements and strains for thin-walled open composite beams with composite laminated material including in their kinematics flexural [...]

  • Finite volumes and finite elements: Two ‘good friends’

    Int. J. Numer. Meth. Engng. (1994). Vol. 37 (19), pp. 3323-3341

    Abstract
    In this paper a comparison between the finite element and the finite volume methods is presented in the context of elliptic, convective–diffusion and fluid flow problems. [...]

  • An accurate nonlocal bonded discrete element method for non linear analysis of solids. Application to concrete fracture tests (preprint)

    M. Celigueta, S. Latorre, F. Arrufat, E. Oñate
    Computational Particle Mechanics (2020). Vol. 7, pp. 543–553, 10.1007/s40571-019-00278-5

    Abstract
    We present a numerical procedure for elastic and non linear analysis (including fracture situations) of solid materials and structures using the Discrete Element Method (DEM). [...]

  • Pulse fracture simulation in shale rock reservoirs. DEM and FEM-DEM approaches

    Comp. Part. Mech (2018). (prepint) Vol. 5 (3), pp. 355-373

    Abstract
    In this paper we analyze the capabilities of two numerical techniques based on DEM and FEM-DEM approaches for the simulation of fracture in shale rock caused by a pulse of [...]

  • Advances in the simulation of multi-fluid flows with the Particle Finite Element Method. Application to bubble dynamics

    M. Mier-Torrecilla, S. Idelsohn, E. Oñate
    Int. J. Numer. Meth. Fluids (2010). Vol. 67 (11), pp. 1516-1539

    Abstract
    In this work we extend the Particle Finite Element Method (PFEM) to multi-fluid flow problems with the aim of exploiting the fact that Lagrangian methods are specially well [...]

  • Finite element formulation for convective-diffusive problems with sharp gradients using finite calculus

    Comput. Methods Appl. Mech. Engrg., (2006). Vol. 195 (13-16), pp. 1793–1825

    Abstract
    A finite element method (FEM) for steady-state convective-diffusive problems presenting sharp gradients of the solution both in the interior of the domain and in boundary [...]

  • Predicción de fracturas en estructuras de hormigón combinando los métodos de elementos finitos y de elementos discretos

    Hormigón y Acero (2018). (prepint) 69, Supl 1, pp. 53-69

    Abstract
    This paper presents the basic concepts and application of the strategy that combines finite element methods (FEM) and discrete elements (DEM)for the study of the propagation [...]

  • A unified monolithic approach for multi-fluid flows and Fluid-Structure Interaction using the Particle Finite Element Method with fixed mesh

    P. Becker, S. Idelsohn, E. Oñate
    Computational Mechanics (2015). (preprint) Vol. 55, pp. 1091–1104

    Abstract
    This paper describes a strategy to solve multi-fluid and Fluid-Structure Interaction (FSI) problems using Lagrangian particles combined with a fixed Finite Element (FE) mesh [...]

  • Advances in the formulation of the rotation-free basic shell triangle

    E. Oñate, F. Flores
    Comput. Methods Appl. Mech. Engrg., (2005). Vol. 194 (21-24), pp. 2406-2443

    Abstract
    A family of rotation-free three node triangular shell elements is presented. The simplest element of the family is based on an assumed constant curvature field expressed in [...]

  • On the derivation and possibilities of the secant stiffness matrix for non linear finite element analysis

    Computational Mechanics (1995). Vol. 15 (6), pp. 572-593

    Abstract
    In this paper the general non symmetric parametric form of the incremental secant stiffness matrix for non linear analysis of solids using the finite element metod is derived. [...]

  • Rotation-free finite element for the non-linear analysis of beams and axisymmetric shells

    F. Flores, E. Oñate
    Comput. Methods Appl. Mech. Engrg., (2006). Vol. 195, pp. 5297–5315

    Abstract
    In this paper a finite element for the non-linear analysis of two dimensional beams and axisymmetric shells is presented. The element uses classical thin shell assumptions [...]

  • Optimización robusta en aplicaciones aeronáuticas con la combinación de cálculo estocástico y algoritmos evolutivos

    J. Pons-Prats, G. Bugeda, F. Zárate, E. Oñate
    Rev. int. métodos numér. cálc. diseño ing. (2012). Vol. 28, (1)

    Abstract
    Uncertainties are a daily issue to deal with in aerospace engineering and applications. Robust optimization methods commonly use a random generation of the inputs and take [...]

  • FIC-FEM formulation for the multidimensional transient advection-diffusion-absorption equation (preprint)

    A. Puigferrat, I. de-Pouplana, E. Oñate
    Computer Methods in Applied Mechanics and Engineering (2020). Vol 365, pp. 112984, DOI: 10.1016/j.cma.2020.112984

    Abstract
    In this paper we present a stabilized FIC-FEM formulation for the multidimensional transient advection-diffusion-absorption equation. The starting point is the non-local form [...]

  • Stabilized formulation for the advection-diffusion-absorption equation using finite calculus and linear finite elements

    E. Oñate, J. Miquel, G. Hauke
    Comput. Methods Appl. Mech. Engrg., (2006). Vol. 195, pp. 3926–3946

    Abstract
    A stabilized finite element method (FEM) for the steady state advection-diffusion-absorption equation is presented. The stabilized formulation is based on the modified governing [...]

  • A simple and efficient element for axisymmetric shells

    O. Zienkiewicz, J. Bauer, K. Morgan, E. Oñate
    International Journal for Numerical Methods in Engineering (1977). Vol. 11 (10), pp. 1545-1558

    Abstract
    A two noded, straight element which includes shear deformation effects is presented and shown to be extremely efficient in the analysis of axisymmetric shells. A single point [...]

  • Fluid-structure interaction using the Particle Finite Element Method

    S. Idelsohn, E. Oñate, F. Pin, N. Calvo
    Comput. Methods Appl. Mech. Engrg., (2006). Vol. 195 (17-18), pp. 2100-2123

    Abstract
    In the present work a new approach to solve fluid-structure interaction problems is described. Both, the equations of motion for fluids and for solids have been approximated [...]

  • Melting and Spread of Polymers in Fire with the Particle Finite Element Method

    Int. J. Numer. Meth. Engng. (2010). Vol. 81 (8), pp. 1046-1072

    Abstract
    A new computational procedure for analysis of the melting and flame spread of polymers under fire conditions is presented. The method, termed Particle Finite Element Method [...]

  • The particle finite element method: a powerful tool to solve incompressible flows with free‐surfaces and breaking waves

    Int. J. Numer. Meth. Engng. (2004). Vol. 61 (7), pp. 964-989

    Abstract
    Particle Methods are those in which the problem is represented by a discrete number of particles. Each particle moves accordingly with its own mass and the external/internal [...]

  • Analysis of some partitioned algorithms for fluid-structure interaction

    Engineering Computations (2010). Vol. 27 (1), pp. 20-56

    Abstract
    The field of fluid-structure interaction (FSI) has important applications ranging from the bio-medical to the civil and aeronautical engineering fields. Despite the different [...]

  • Error estimation and mesh adaptivity in incompressible viscous flows using a residual power approach

    Comput. Methods Appl. Mech. Engrg., (2006). Vol. 195, pp. 339-362

    Abstract
    A methodology for error estimation and mesh adaptation for finite element (FE) analysis of incompressible viscous flow is presented. The error estimation method is based on [...]

  • ODDLS: A new unstructured mesh finite element method for the analysis of free surface flow problems

    Int. J. Numer. Meth. Engng. (2008). Vol 76 (9), pp. 1297-1327

    Abstract
    This paper introduces a new stabilized finite element method based on the finite calculus (Comput. Methods Appl. Mech. Eng. 1998; 151:233–267) and arbitrary [...]

  • An unstructured finite element solver for ship hydrodynamics problems

    Journal of Applied Mechanics (2003). 70(1): 18-26

    Abstract
    A stabilized semi-implicit fractional step algorithm based on the finite element method for solving ship wave problems using unstructured meshes is presented. The stabilized [...]

  • Modelling the vertical UL 94 test: competition and collaboration between melt dripping, gasification and combustion

    F. Kempel, B. Schartel, J. Marti, K. Butler, R. Rossi, S. Idelsohn, E. Oñate
    Fire and Materials (2015). Vol. 39 (6), pp. 570-584

    Abstract
    An experimental and numerical investigation of the effect of bisphenol A bis(diphenyl phosphate) (BDP) and polytetrafluoroethylene (PTFE) on the fire behaviour of bisphenol [...]

  • Methodological-technological framework for construction 4.0

    F. Muñoz, J. Mora-Serrano, I. Valero, E. Oñate
    Archives of Computational Methods in Engineering (2021). Vol. 28, pp. 689–711

    Abstract
    The construction industry has traditionally been characterised by the high diversity of its agents and processes, high resistance to change and low incorporation of technology [...]

  • On a non‐linear formulation for curved Timoshenko beam elements considering large displacement/rotation increments

    E. Dvorkin, E. Oñate, J. Oliver
    Int. J. Numer. Meth. Engng. (1988). Vol. 26 (7), pp. 1597-1613

    Abstract
    An incremental Total Lagrangian Formulation for curved beam elements that includes the effect of large rotation increments is developed. A complete and symmetric tangent stiffness [...]

  • Stabilized solution of the multidimensional advection-diffusion-absorption equation using linear finite elements

    E. Oñate, J. Miquel, F. Zárate
    Computers and Fluids (2007). Vol. 36 (1), pp. 92-112, 2007

    Abstract
    A stabilized finite element method (FEM) for the multidimensional steady state advection-diffusion-absorption equation is presented. The stabilized formulation is based on [...]

  • Las herramientas numéricas y la práctica profesional en Ingeniería Civil

    Revista de Obras Públicas (2002). Vol. 149 (3418), pp. 7-15

    Abstract
    This paper presents some thoughts about the evolution of numerical methods and the difficulties posed by their applications to solve real problems of everyday´s engineering. [...]

  • Analysis of bridges by the finite strip method

    Hormigón y Acero (1977). Vol. 124, pp. 53-85

    Abstract
    Se presenta el análisis general de estructuras formadas por un ensamblaje de placas y vigas y con sección transversal constante, mediante una combinación [...]

  • Derivation of stabilized equations for numerical solution of advective-diffusive transport and fluid flow problems

    Comput. Methods Appl. Mech. Engrg., (1998). Vol. 151 (1-2), pp. 233-265

    Abstract
    The concept of the so called “artificial or balancing diffusion” used to stabilize the numerical solution of advective–diffusive transport and fluid flow [...]

  • Finite element nonlinear analysis of concrete structures using a “plastic-damage model”

    S. Oller, E. Oñate, J. Oliver, J. Lubliner
    Engineering Fracture Mechanics (1990). Vol. 35 (1-2-3), pp. 219-231

    Abstract
    In this paper a plastic damage model for nonlinear finite element analysis of concrete is presented. The model is based on standard plasticity theory for frictional [...]

  • Mejora de la solución fuertemente acoplada de problemas FSI mediante una aproximación de la matriz tangente de presión

    R. Rossi, S. Idelsohn, E. Oñate, J. Cotela, F. Pin
    Rev. int. métodos numér. cálc. diseño ing. (2011). Vol. 27, (3)

    Abstract
    La interacción de los fluidos con las estructuras de su entorno es un desafío clásico para las técnicas numéricas. El objetivo de este trabajo es doble: en primer lugar [...]

  • Dynamic modelling of retrogressive landslides with emphasis on the role of clay sensitivity

    X. Zhang, S. Sloan, E. Oñate
    Int. Journal for Numerical and Analytical Methods in Geomechanics (2018). Vol. 42, pp. 1806-1822 (preprint)

    Abstract
    This paper presents a detailed numerical study of the retrogressive failure of landslides in sensitive clays. The dynamic modelling of the landslides is carried out [...]

  • Un elemento de sólido con una mejora en el comportamiento del corte transversal para el tratamiento de láminas

    F. Flores, E. Oñate
    Rev. int. métodos numér. cálc. diseño ing. (2011). Vol. 27, (4)

    Abstract
    In this work a solid finite element based on a Total Lagrangian Formulation using logarithmic strains is combined with a classical assumed strain approach of the transverse [...]

  • A coupled fluid FEM-DEM technique for predicting blasting operations in tunnels

    F. Zarate, J. Gonzalez, J. Miquel, R. Lohner, E. Oñate
    Underground Space (2018). Vol. 3 (4), pp. 310-316, (prepint)

    Abstract
    We present recent developments in the coupling of the finite element method (FEM) and the discrete element method (DEM) for analysis of rock blasting operations in tunnels. [...]

  • Combination of the critical displacement method with a damage model for structural instability analysis

    E. Oñate, H. Tschöpe, P. Wriggers
    Engineering Computations (2001). Vol. 18 (3-4), pp. 642-662

    Abstract
    The paper describes the extension of the critical displacement method (CDM), presented by Oñate and Matias in 1996, to the instability analysis of structures with [...]

  • A fourth‐order compact scheme for the Helmholtz equation: Alpha‐interpolation of FEM and FDM stencils

    Int. J. Numer. Meth. Engng. (2011). Vol. 86 (1), pp. 18-46

    Abstract
    We propose a fourth‐order compact scheme on structured meshes for the Helmholtz equation given by R(φ):=f(x)+Δφ+ξ2φ=0. The scheme consists of taking [...]

  • Numerical simulation of fiber reinforced composite materials––two procedures

    E. Car, F. Zalamea, S. Oller, J. Canet, E. Oñate
    Int. J. Solids and Structures (2002). Vol. 39 (7), pp. 1967-1986

    Abstract
    In this work, two methodologies for the analysis of unidirectional fiber reinforced composite materials are presented. The first methodology used is a generalized anisotropic [...]

  • Detailed simulation of viral propagation in the built environment (preprint)

    R. Lohner, H. Antil, S. Idelsohn, E. Oñate
    Computational Mechanics (2020). 10.1007/s00466-020-01881-7

    Abstract
    A summary is given of the mechanical characteristics of virus contaminants and the transmission via droplets and aerosols. The ordinary and partial differential equations [...]

  • Advances in stabilized finite element and particle methods for bulk forming processes

    E. Oñate, J. Rojek, M. Chiumenti, S. Idelsohn, F. Pin, R. Aubry
    Comput. Methods Appl. Mech. Engrg., (2006). Vol. 195, pp. 6750-6777

    Abstract
    The paper describes some recent developments in finite element and particle methods for analysis of a wide range of bulk forming processes. The developments include new stabilized [...]

  • Discrete element simulation of rock cutting

    J. Rojek, E. Oñate, C. Labra, H. Kargl
    Int. J. Rock Mechanics and Mining Sciences (2011). Vol. 48 (6), pp. 996-1010

    Abstract
    This paper presents numerical modelling of rock cutting processes. The model consists of a tool–rock system. The rock is modelled using the discrete element method, [...]

  • Flow of solids during forming and extrusion: Some aspects of numerical solutions

    O. Zienkiewicz, P. Jain, E. Oñate
    Int. J. Solids and Structures (1978). Vol. 14 (1), pp. 15-38

    Abstract
    In the extrusion and forming of solids the plastic (or viscoplastic) deformations are so large that the elastic strain is negligible. The problem thus becomes one of incompressible [...]

  • Sobre la necesidad de controlar el error de discretización de elementos finitos en optimización de forma estructural con algoritmos evolutivos

    J. Ródenas, G. Bugeda, J. Albelda, E. Oñate, E. Nadal
    Rev. int. métodos numér. cálc. diseño ing. (2012). Vol. 28, (1)

    Abstract
    This work analyzes the influence of the discretization error contained in the Finite Element (FE) analyses of each design configuration proposed by the structural shape optimization [...]

  • A total Lagrangian formulation for the geometrically nonlinear analysis of structures using finite elements. Part I. Two‐dimensional problems: Shell and plate structures

    J. Oliver, E. Oñate
    Int. J. Numer. Meth. Engng. (1984). Vol. 20 (12), pp. 2253-2281

    Abstract
    A total Lagrangian finite element formulation for the geometrically nonlinear analysis (large displacement/large rotations) of shells is presented. Explicit expressions of [...]

  • Derivation of thin plate bending elements with one degree of freedom per node: a simple three node triangle

    Engineering Computations (1993). Vol. 10 (6), pp. 543-561

    Abstract
    A general methodology for deriving thin plate bending elements with a single degree of freedom per node is presented. The formulation is based on the combination of a standard C0 [...]

  • Polyhedrization of an arbitrary 3D point set

    S. Idelsohn, N. Calvo, E. Oñate
    Comput. Methods Appl. Mech. Engrg., (2003). Vol. 192, pp. 2649–2667

    Abstract
    Given a 3D point set, the problem of defining the volume associated, dividing it into a set of regions (elements) and defining a boundary surface is tackled. Several [...]

  • A high-resolution Petrov-Galerkin method for the 1D convection-diffusion-reaction problem

    Int. J. Numer. Meth. Engng. (2010). Vol. 199, pp. 525–546

    Abstract
    We present the design of a high-resolution Petrov–Galerkin (HRPG) method using linear finite elements for the problem defined by the residual R (phi):= partial phi [...]

  • Optimización de embarcaciones de recreo mediante la utilización de un código CFD

    M. López-Rodríguez, J. García-Espinosa, E. Oñate
    Ingeniería Naval (2001). Vol. 784, pp. 122-130

    Abstract
    En la actualidad las más avanzadas técnicas para diseño naval ya no se restringen sólo a proyectos de alto coste; si no que también ahora [...]

  • Multiscale computational analysis in mechanics using finite calculus. An introduction

    Comput. Methods Appl. Mech. Engrg., (2003). Vol. 192 (28-30), pp. 3043-3059

    Abstract
    The paper introduces a general procedure for computational analysis of a wide class of multiscale problems in mechanics using a finite calculus (FIC) formulation. The FIC [...]

  • A stabilized mixed implicit Material Point Method for non-linear incompressible solid mechanics

    Computational Mechanics (2019). Vol. 63 (6), pp. 1243–1260

    Abstract
    In this work a stabilized mixed formulation for the solution of non-linear solid mechanics problems in nearly-incompressible conditions is presented. In order to deal with [...]

  • A total Lagrangian formulation for the geometrically nonlinear-analysis of structures using finite-elements. Part II: arches, frames and axisymmetric shells

    J. Oliver, E. Oñate
    Int. J. Numer. Meth. Engng. (1986). Vol. 23 (2), pp. 253-274

    Abstract
    A geometrically nonlinear finite element formulation based on a total Lagrangian approach for axisymmetric shells, arches and frames has been presented. The formulation allows [...]

  • Fatigue analysis of materials and structures using a continuum damage model

    International Journal of Forming Processes (2002). Vol. 5 (2-3-4), pp. 493-503

    Abstract
    The scatter in the fatigue life of the metallic structures seems to be mainly caused by internal defects of the material (porosity, inclusions as oxide films and carbon layers, [...]

  • High‐density sphere packing for discrete element method simulations

    C. Labra, E. Oñate
    Commun. Numer. Meth. Engng (2009). Vol. 25 (7), pp. 837-849

    Abstract
    The first step in a discrete element simulation is the discretization of the domain into a set of particles. The cost of generating a good cylindrical or spherical packing [...]

  • Numerical analysis of stereolithography processes using the finite element method

    Rapid Prototyping Journal (1995). Vol. 1 (2), pp. 13-23

    Abstract
    Stereolithography (SLA) is one of the most important techniques used in rapid prototyping processes. It has a great industrial interest because it allows for dramatic time [...]

  • El valor del cálculo en los sistemas de ayuda a la toma de decisiones en ingeniería

    Revista de Obras Públicas (2004). Vol. 151 (3449), pp. 41-48

    Abstract
    El artículo revindica el valor de los métodos de cálculo que se enseñan en las Escuelas de Ingeniería, como herramientas indispensables [...]

  • A stabilized finite point method for analysis of fluid mechanics problems

    E. Oñate, S. Idelsohn, O. Zienkiewicz, R. Taylor, C. Sacco
    Comput. Methods Appl. Mech. Engrg., (1996). Vol. 195, pp. 6750-6777

    Abstract
    flow type problems is presented. The method is based on the use of a weighted least square interpolation procedure together with point collocation for evaluating the approximation [...]

  • A finite point method for elasticity problems

    Computers and Structures (2001). Vol. 79 (22-25), pp. 2151-2163

    Abstract
    The basis of the finite point method (FPM) for the fully meshless solution of elasticity problems in structural mechanics is described. A stabilization [...]

  • A continuum mechanics model for mechanical fatigue analysis

    Computational Materials Science (2005). Vol. 32 (2), pp. 175-195

    Abstract
    In this paper, a thermo-mechanical constitutive model for the predictions of fatigue in structures using the finite element method is formulated. The model is based on the [...]

  • Nonlinear finite element analysis of orthotropic and prestressed membrane structures

    Finite Elements in Analysis and Design (2009). Vol. 45 (6-7), pp. 395-405

    Abstract
    A new methodology for the geometrically nonlinear analysis of orthotropic membrane structures using triangular finite elements is presented. The approach is based on writing [...]

  • Solving structural optimization problems with genetic algorithms and simulated annealing

    S. Botello, J. Marroquín, E. Oñate
    Int. J. Numer. Meth. Engng. (1999). Vol. 45 (8), pp. 1069-1084

    Abstract
    In this paper we study the performance of two stochastic search methods: Genetic Algorithms and Simulated Annealing, applied to the optimization of pin‐jointed steel bar [...]

  • A simple method for automatic update of finite element meshes

    G. Chiandussi, G. Bugeda, E. Oñate
    Commun. Numer. Meth. Engng (2000). Vol. 16 (1), pp. 1-19

    Abstract
    A simple method to automatically update the finite element mesh of the analysis domain is proposed. The method considers the mesh as a fictitious elastic body subjected to [...]

  • P1/P0+ elements for incompressible flows with discontinuous material properties

    Comput. Methods Appl. Mech. Engrg., (2015). Vol. 293, pp. 191-206

    Abstract
    We present a 3-noded triangle and a 4-noded tetrahedra with a continuous linear velocity and a discontinuous linear pressure field formed by the sum of an unknown ''constant [...]

  • The challenge of mass conservation in the solution of free‐surface flows with the fractional‐step method: Problems and solutions

    Int. J. Numer. Meth. Biomed. Engng (2010). Vol. 26 (10), pp. 1313-1330

    Abstract
    The purpose of this paper is to put in evidence that the fractional‐step method (FSM) used to solve the incompressible transient Euler and Navier–Stokes equations [...]

  • Neural networks for variational problems in engineering

    R. Lopez, E. Balsa-Canto, E. Oñate
    Int. J. Numer. Meth. Engng. (2008). Vol. 75 (11), pp. 1341-1360

    Abstract
    In this work a conceptual theory of neural networks (NNs) from the perspective of functional analysis and variational calculus is presented. Within this formulation, the learning [...]

  • Análisis CFD del movimiento de balance de un portacontenedores

    J. García-Espinosa, E. Oñate, J. Helmers, M. Chakkor
    Revista de Ingeniería Naval (2004). Vol. 814, pp. 104-108

    Abstract
    In the present work a novel approach has been developed for the resolution of this problem of analysis of the movement of roll of a ship. The methodology used for this is [...]

  • Shape variable definition with C0 , C1 and C2 continuity functions

    G. Chiandussi, G. Bugeda, E. Oñate
    Comput. Methods Appl. Mech. Engrg., (2000). Vol. 188, pp. 727-742

    Abstract
    The present paper proposes a new technique for the definition of the shape design variables in 2D and 3D optimisation problems. It can be applied to the discrete model of [...]

  • An investigation on thermal performance of wollastonite and bentonite reinforced intumescent fire-retardant coating for steel structures

    F. Ahmad, S. Ullah, N. Merican, E. Oñate, A. Al-Sehemi, G. Yeoh
    Construction and Building Material (2019). Vol. 228, 116734

    Abstract
    This research emphases on the synthesis of new formulations of intumescent coating with improved thermal performance for steel structures. The coating formulations were based [...]

  • A family of residual‐based stabilized finite element methods for Stokes flows

    Int. J. Numer. Meth. Fluids (2011). Vol. 65 (1-3), pp. 106-134

    Abstract
    We present a collection of stabilized finite element (FE) methods derived via first‐ and second‐order finite calculus (FIC) procedures. It is shown that several well known [...]

  • Rotation‐free triangular plate and shell elements

    E. Oñate, F. Zárate
    Int. J. Numer. Meth. Engng. (2000). Vol. 47 (1-3), pp. 557-603

    Abstract
    The paper describes how the finite element method and the finite volume method can be successfully combined to derive two new families of thin plate and shell triangles with [...]

  • A constitutive model for cracking of concrete based on the incremental theory of plasticity

    E. Oñate, S. Oller, J. Oliver, J. Lubliner
    Engineering Computations (1988). Vol. 5 (4), pp. 309-319

    Abstract
    A constitutive model based on classical plasticity theory for non‐linear analysis of concrete structures using finite elements is presented. The model uses the typical parameters [...]

  • On the simulation of flows with violent free surface motion

    R. Lohner, C. Yang, E. Oñate
    Comput. Methods Appl. Mech. Engrg., (2006). Vol. 195, pp. 5597–5620

    Abstract
    A volume of fluid (VOF) technique has been developed and coupled with an incompressible Euler/Navier–Stokes solver operating on adaptive, unstructured grids to simulate [...]

  • An advancing front point generation technique

    R. Löhner, E. Oñate
    Commun. Numer. Meth. Engng (1998). Vol. 14 (12), pp. 1097-1108

    Abstract
    An algorithm to construct boundary‐conforming, isotropic clouds of points with variable density in space is described. The input required consists of a specified mean point [...]

  • Discrete/finite element modelling of rock cutting with TBM disc cutter

    C. Labra, J. Rojek, E. Oñate
    Rock Mechanics and Rock Engineering (2017). Vol. 50 (3), pp. 621-638

    Abstract
    This paper presents advanced computer simulation of rock cutting process typical for excavation works in civil engineering. Theoretical formulation of the hybrid discrete/finite [...]

  • A simple triangular element for thick and thin plate and shell analysis

    E. Oñate, F. Zárate, F. flores
    Int. J. Numer. Meth. Engng. (1994). Vol. 37 (15), pp. 2569-2582

    Abstract
    A new plate triangle based on Reissner–Mindlin plate theory is proposed. The element has a standard linear deflection field and an incompatible linear rotation field [...]

  • The intrinsic time for the streamline upwind Petrov-Galerkin formulation using quadratic elements

    Comput. Methods Appl. Mech. Engrg., (1992). Vol. 94, pp. 239-262

    Abstract
    In this paper the functions of the Péclet number that appear in the intrinsic time of the streamline upwind/Petrov-Galerkin (SUPG) formulation are analyzed for quadratic [...]

  • A coupled PFEM–Eulerian approach for the solution of porous FSI problems

    Computational Mechanics (2012). Vol. 50 (6), pp. 805-819

    Abstract
    This paper aims to present a coupled solution strategy for the problem of seepage through a rockfill dam taking into account the free-surface flow within the solid as well [...]

  • A finite point method for adaptive three‐dimensional compressible flow calculations

    Int. J. Numer. Meth. Fluids (2008). Vol. 60 (9), pp. 937-971

    Abstract
    The finite point method (FPM) is a meshless technique, which is based on both, a weighted least‐squares numerical approximation on local clouds of points and a collocation [...]

  • A Finite Element Model for the Simulation of the UL-94 Burning Test

    Fire Technology (2018). Vol. 54 (6), pp. 1783–1805

    Abstract
    The tendency of the polymers to melt and drip when they are exposed to external heat source play a very important role in the ignition and the spread of fire. Numerical simulation [...]

  • Analysis of a consistency recovery method for the 1D convection–diffusion equation using linear finite elements

    International Journal for Numerical Methods in Fluids (2008). 57 (9), 1291-1320, 2008

    Abstract
    For residual-based stabilization methods such as streamline-upwind Petrov–Galerkin (SUPG) and finite calculus (FIC), the higher-order derivatives of the residual that [...]

  • Lagrangian formulations to solve free surface incompressible inviscid fluid flows

    Comput. Methods Appl. Mech. Engrg., (2001). Vol. 191 (6–7), pp. 583-593

    Abstract
    A particle method is presented for the solution of the incompressible inviscid fluid flow equation using a Lagrangian formulation. The interpolated function are those used [...]

  • A Petrov–Galerkin formulation for the alpha interpolation of FEM and FDM stencils: Applications to the Helmholtz equation

    Int. J. Numer. Meth. Engng. (2012). Vol. 89 (11), pp. 1367-1391

    Abstract
    A new Petrov–Galerkin (PG) method involving two parameters, namely α1 and α2, is presented, which yields the following schemes on rectangular [...]

  • To mesh or not to mesh. That is the question. . .

    Comput. Methods Appl. Mech. Engrg., (2006). Vol. 195, pp. 4681–4696

    Abstract
    In the last decade a family of methods called meshless methods has been developed both for structural and fluid mechanics problems. After these ideas, a possible classification [...]

  • Plate bending elements with discrete constraints: New triangular elements

    O. Zienkiewicz, R. Taylor, P. Papadopoulos, E. Oñate
    Computers and Structures (1990). Vol. 35 (4), pp. 505-522

    Abstract
    In recent years a series of elements based on Reissner-Mindlin assumptions and using discrete (collocation type) constraints has been introduced. These elements have [...]

  • Application of explicit FE codes to simulation of sheet and bulk metal forming processes

    J. Rojek, E. Oñate, E. Postek
    Journal of Materials Processing Technology (1998). Vols. 80-81, pp. 620-627

    Abstract
    This paper presents the application of an explicit dynamic finite element code for simulation of metal forming processes, of both sheet and bulk forming. The experiences [...]

  • A Lagrangian meshless finite element method applied to fluid–structure interaction problems

    Computers and Structures (2003). Vol. 81 (8-11), pp. 655-671

    Abstract
    A method is presented for the solution of the incompressible fluid flow equations using a Lagrangian formulation. The interpolation functions are [...]

  • Computation of turbulent flows using a finite calculus–finite element formulation

    International journal for numerical methods in fluids (2007). 54 (6‐8), 609-637, 2007

    Abstract
    We present a formulation for analysis of turbulent incompressible flows using a stabilized finite element method (FEM) based on the finite calculus (FIC) procedure. The stabilization [...]

  • A Lagrangian nodal integration method for free-surface fluid flows

    A. Franci, M. Cremonesi, U. Perego, E. Oñate
    Comput. Methods Appl. Mech. Engrg., (2020). Vol. 361, 112816

    Abstract
    We present a Lagrangian nodal integration method for the simulation of Newtonian and non-Newtonian free-surface fluid flows. The proposed nodal Lagrangian method uses a finite [...]

  • FIC/FEM Formulation with Matrix Stabilizing Terms for Incompressible Flows at Low and High Reynolds Numbers

    Computational Mechanics (2006). Vol. 38 (4-5), pp. 440-455

    Abstract
    We present a general formulation for incompressible fluid flow analysis using the finite element method. The necessary stabilization for dealing with convective effects and [...]

  • Air demand estimation in bottom outlets with the particle finite element method. Susqueda Dam case study.

    Comp. Part. Mech (2017). Vol. 4 (3), pp. 345-356

    Abstract
    Dam bottom outlets play a vital role in dam operation and safety, as they allow controlling the water surface elevation below the spillway level. For partial openings, water [...]

  • Comparative study of different discrete element models and evaluation of equivalent micromechanical parameters

    J. Rojek, C. Labra, O. Su, E. Oñate
    Int. J. Solids and Structures (2012). Vol 49 (13), pp. 1497-1517

    Abstract
    Comparative studies of different discrete element models of a rock-type material are presented. The discrete element formulation employs spherical particles with the cohesive [...]

  • A computational model for progressive cracking in large dams due to the swelling of concrete

    M. Cervera, J. Oliver, E. Herrero, E. Oñate
    Engineering Fracture Mechanics (1990). Vol. 35 (1-3), pp. 573-585

    Abstract
    The paper presents a computational model for the analysis of large concrete gravity dams subjected to severe damage due to internal actions. It has been observed in several [...]

  • Modelling and simulation of the sea-landing of aerial vehicles using the Particle Finite Element Method

    Ocean Engng. (2013). Vol. 66, pp. 92-100

    Abstract
    In this paper the Particle Finite Element Method (PFEM) is applied to the simulation of the sea-landing of an unmanned aerial vehicle (UAV). The problem of interest consists [...]

  • Failure pressure evaluation of the containment building of a large dry nuclear power plant

    A. Barbat, M. Cervera, A. Hanganu, C. Cirauqui, E. Oñate
    Nuclear Engineering and Design (1998). 180, 251 – 270

    Abstract
    The evaluation of the failure pressure of the containment building of a large dry PWR-W three loops nuclear power plant, based on computer numerical simulation, is described [...]

  • A stabilized finite element method for incompressible viscous flows using a finite increment calculus formulation

    Comput. Methods Appl. Mech. Engrg., (2000). Vol. 182 (3-4), pp. 355-370

    Abstract
    A stabilized finite element formulation for incompressible viscous flows is derived. The starting point are the modified Navier-Stokes equations incorporating naturally the [...]

  • A general methodology for deriving shear constrained Reissner-Mindlin plate elements

    E. Oñate, O. Zienkiewicz, B. Suarez, R. Taylor
    Int. J. Numer. Meth. Engng. (1992). Vol. 33 (2), pp. 345-367

    Abstract
    In this paper the necessary requirements for the good behaviour of shear constrained Reissner–Mindlin plate elements for thick and thin plate situations are re‐interpreted [...]

  • Flow behaviour of negatively buoyant jets in immiscible ambient fluid

    A. Geyer, J. Phillips, M. Mier-Torrecilla, S. Idelsohn, E. Oñate
    Experiments in Fluids (2012). Vol 52 (1), pp. 261-257

    Abstract
    In this paper we investigate experimentally the injection of a negatively buoyant jet into a homogenous immiscible ambient fluid. Experiments are carried out by injecting [...]

  • Wrinkling and folding analysis of elastic membranes using an enhanced rotation-free thin shell triangular element

    F. Flores, E. Oñate
    Finite Elements in Analysis and Design (2011). Vol. 47 (9), pp. 982-990

    Abstract
    This paper presents a formulation for analysis of thin elastic membranes using a rotation-free shell element within an explicit time integration strategy. The applications [...]

  • A viscous shell formulation for the analysis of thin sheet metal forming

    E. Oñate, O. Zienkiewicz
    Int. J. Mechanical Sciences (1983). Vol. 25 (5), pp. 305-335

    Abstract
    A finite element method to analyse large plastic deformations of thin sheets of metal is presented. The formulation is based on an extension of the general viscoplastic flow [...]

  • Analisis de la inestabilidad de estructuras por el método de desplazamiento crítico

    W. Matias Silva, E. Oñate
    Rev. int. métodos numér. cálc. diseño ing. (1997). Vol. 13, (2)

    Abstract
    Se presenta una nueva técnica de predicción de puntos críticos en el análisis de inestabilidad estructural por el MEF. El procedimiento se basa [...]

  • The Double Hierarchy Method. A parallel 3D contact method for the interaction of spherical particles with rigid FE boundaries using the DEM

    M. Santasusana, J. Irazábal, E. Oñate, J. Carbonell
    Comp. Part. Mech (2016). Vol. 3, pp. 407-428

    Abstract
    In this work, we present a new methodology for the treatment of the contact interaction between rigid boundaries and spherical discrete elements (DE). Rigid body parts are [...]

  • Direct computation of instability points with inequality constraints using the FEM

    H. Tschöpe, P. Wriggers, E. Oñate
    Engineering Computations (2003). Vol. 20 (5-6), pp. 611-628

    Abstract
    The subject of this paper is the computation of instability points in mechanical problems with the finite element method. The objective is to extend the application of critical [...]

  • General advancing front packing algorithm for the discrete element method

    C. Recarey Morfa, I. Pérez, M. Farías, E. Oñate, R. Valera, H. Casañas
    Comp. Part. Mech (2018). Vol. 5, pp 13–33

    Abstract
    A generic formulation of a new method for packing particles is presented. It is based on a constructive advancing front method, and uses Monte Carlo techniques for the generation [...]

  • An anisotropic elastoplastic constitutive model for large deformation analysis of fibre reinforced composites

    Comput. Methods Appl. Mech. Engrg., (2000). Vol. 185, pp. 245-277

    Abstract
    In this work a generalized anisotropic elastoplastic constitutive model in large deformation is presented. It is used for the analysis of fiber-reinforced composite materials [...]

  • An anisotropic elastoplastic model based on an isotropic formulation

    Engineering Computations (1995). Vol. 12 (3), pp. 245-262

    Abstract
    This paper shows a generalization of the classic isotropic plasticity theory to be applied to orthotropic or anisotropic materials. This approach assumes the existence of [...]

  • Fast fluid–structure interaction simulations using a displacement-based finite element model equipped with an explicit streamline integration prediction

    Comput. Methods Appl. Mech. Engrg., (2017). Vol. 315, pp. 1080-1097

    Abstract
    We propose here a displacement-based updated Lagrangian fluid model developed to facilitate a monolithic coupling with a wide range of structural elements [...]

  • On the pseudomaterial approach for the analysis of transient forming processes

    Commun. Numer. Meth. Engng (1995). Vol. 11 (2), pp. 137-148

    Abstract
    A fixed‐mesh method for the analysis of transient forming processes is presented. The mesh covers material regions and zones through which the material may flow. These last [...]

  • Mould filling simulation using finite elements

    R. Codina, U. Schäfer, E. Oñate
    Int. J. of Num. Meths. for Heat and Fluid Flow (1994). Vol. 4 (1), pp. 291-310

    Abstract
    In this paper we consider several aspects related to the application of the pseudo‐concentration techniques to the simulation of mould filling processes. We discuss, in [...]

  • Migration of a generic multi-physics framework to HPC environments

    P. Dadvand, R. Rossi, M. Gil, X. Martorell, J. Cotela, E. Juanpere, S. Idelsohn, E. Oñate
    Computers and Fluids (2013). Vol. 80, pp. 301-309

    Abstract
    Creating a highly parallelizable code is a challenge specially for Distributed Memory Machines (DMMs). Moreover, algorithms and data structures suitable for these platforms [...]

  • A bonded discrete element method for modeling ship–ice interactions in broken and unbroken sea ice fields

    O. Jou Devesa, M. Celigueta, S. Latorre, F. Arrufat, E. Oñate
    Computational Particle Mechanics (2019). Vol. 6 (4), pp 739–765

    Abstract
    This work investigates the failure patterns of ice cakes and floe-icewhen loaded by amoving and sloping structure (ice-breaking ships and cones). In the paper, we introduce [...]

  • Numerical modelling and simulation of frictional contact using a generalised coulomb law

    A. Heege, P. Alart, E. Oñate
    Engineering Computations (1995). Vol. 12 (7), pp. 641-656

    Abstract
    A consistent formulation for unilateral contact problems including frictional work hardening or softening is proposed. The approach is based on an augmented Lagrangian approach [...]

  • Free vibration analysis of plates, bridges and axisymmetric shells using a thick finite strip method

    B. Suarez, J. Canet, E. Oñate
    Engineering Computations (1988). Vol. 5 (2), pp. 158-164

    Abstract
    A unified approach for the vibration analysis of curved or straight prismatic plates and bridges and axisymmetric shells using a finite strip method based in Reissner—Mindlin [...]

  • A scalar damage model with a shear retention factor for the analysis of reinforced concrete structures: theory and validation

    R. Scotta, R. Vitaliani, A. Saetta, E. Oñate, A. Hanganu
    Computers and Structures (2001). Vol. 79 (7), pp. 737-755

    Abstract
    A local isotropic single parameter scalar model that can simulate the mechanical behaviour of quasi-brittle materials, such as concrete, is described. [...]

  • A temperature‐based formulation for finite element analysis of generalized phase‐change problems

    Int. J. Numer. Meth. Engng. (1994). Vol. 37 (20), pp. 3441-3465

    Abstract
    A finite element formulation for solving multidimensional phase‐change problems is presented. The formulation considers the temperature as the unique state variable, it [...]

  • A high-resolution Petrov-Galerkin method for the convection-diffusion-reaction problem. Part II-A multidimensional extension

    Comput. Methods Appl. Mech. Engrg., (2012). Vol. 213-216, pp. 327-352

    Abstract
    A multidimensional extension of the HRPG method using the lowest order block finite elements is presented. First, we design a nondimensional element number that quantifies [...]

  • A penalty finite element method for non‐Newtonian creeping flows

    Int. J. Numer. Meth. Engng. (1993). Vol. 36 (8), pp. 1395-1412

    Abstract
    In this paper we present an iterative penalty finite element method for viscous non‐Newtonian creeping flows. The basic idea is solving the equations for the difference [...]

  • Advances in FE explicit formulation for simulation of metalforming processes

    J. Rojek, O. Zienkiewicz, E. Oñate, E. Postek
    Journal of Materials Processing Technology (2001). Vol. 119, pp. 41-47

    Abstract
    This paper presents some advances of finite element explicit formulation for simulation of metal forming processes. Because of their computational efficiency, finite element [...]

  • Particle finite element method in fluid-mechanics including thermal convection-diffusion

    Computers and Structures (2005). Vol. 83 (17-18), pp. 1459-1475

    Abstract
    A method is presented for the solution of an incompressible viscous fluid flow with heat transfer using a fully Lagrangian description of the motion. Due [...]

  • The violation of objectivity in Laplace formulations of the Navier–Stokes equations

    Int. J. Numer. Meth. Fluids (2007). Vol. 54 (6-8), pp. 639-664

    Abstract
    The Navier–Stokes equations written in Laplace form are often the starting point of many numerical methods for the simulation of viscous flows. Imposing the natural [...]

  • Large time-step explicit integration method for solving problems with dominant convection

    S. Idelsohn, N. Nigro, A. Limache, E. Oñate
    Comput. Methods Appl. Mech. Engrg., (2012). Vol. 217-220, pp. 168-185

    Abstract
    An explicit time integrator without the CFL < 1 restriction for the momentum equation is presented. This allows stable large time-steps in problems dominated [...]

  • Non‐linear explicit dynamic analysis of shells using the BST rotation‐free triangle

    E. Oñate, P. Cendonya, J. Canet
    Engineering Computations (2002). Vol. 19 (6), pp. 662-706

    Abstract
    The paper describes the application of the simple rotation‐free basic shell triangle (BST) to the non‐linear analysis of shell structures using an explicit dynamic formulation. [...]

  • Variational Framework for FIC Formulations in Continuum Mechanics: High Order Tensor-Derivative Transformations and Invariants

    C. Felippa, E. Oñate, S. Idelsohn
    Archives of Comp. Meths. Engng. (2018). Vol. 25 (4), pp. 919–963

    Abstract
    This is part of an article series on a variational framework for continuum mechanics based on the Finite Increment Calculus (FIC). The formulation utilizes high order derivatives [...]

  • A homogeneous constitutive model for masonry

    J. Lopez, S. Oller, E. Oñate, J. Lubliner
    Int. J. Numer. Meth. Engng. (1999). Vol. 46 (10), pp. 1651-1671

    Abstract
    Masonry has been a broadly used material since the beginning of human life. Despite its popularity, the analysis of masonry structures is a complex task due to the heterogeneity [...]

  • Comparative study on sheet metal forming processes by numerical modelling and experiment

    Journal of Materials Processing Technology (1992). Vol. 34 (1-4), pp. 109-116

    Abstract
    In this paper some results of a wide experimental program are presented and compared with some finite element solution of sheet metal forming problems using a viscous shell [...]

  • Modelación del ensayo brasileño empleando modelación discreta

    C. Recarey Morfa, E. Oñate, J. Rojek, J. Canet, F. Zárate, G. Cadoce, C. Labra
    Ingeniería Civil (2005). Vol. 139, pp. 112-124

    Abstract
    Se presenta un modelo de elementos discretos o distintos (MED) en la modelizacion del ensayo de traccion indirecta o ensayo brasileno (Brazilian Test). Se realiza una comparacion [...]

  • A finite point method for compressible flow

    R. Löhner, C. Sacco, E. Oñate, S. Idelsohn
    Int. J. Numer. Meth. Engng. (2002). Vol. 53 (8), pp. 1765-1779

    Abstract
    A weighted least squares finite point method for compressible flow is formulated. Starting from a global cloud of points, local clouds are constructed using a Delaunay technique [...]

  • A four‐noded quadrilateral element for composite laminated plates/shells using the refined zigzag theory

    Int. J. Numer. Meth. Engng. (2013). Vol. 95 (8), pp. 631-660

    Abstract
    A new bilinear four‐noded quadrilateral element (called quadrilateral linear refined zigzag) for the analysis of composite laminated and sandwich plates/shells based on [...]

  • Finite element analysis of sheet metal forming problems using a selective viscous bending/membrane formulation

    Int. J. Numer. Meth. Engng. (1990). Vol. 30 (8), pp. 1577-1593

    Abstract
    In this paper the possibilities of the viscous voided shell approach for deriving bending/membrane finite elements for sheet metal forming problems are presented. These elements [...]

  • A general procedure for deriving symmetric expressions for the secant and tangent stiffness matrices in finite element analysis

    A. Morán, E. Oñate, J. Miquel
    Int. J. Numer. Meth. Engng. (1998). Vol. 42 (2), pp. 219-236

    Abstract
    The paper presents a general and straightforward procedure based on the use of the strain energy density for deriving symmetric expressions of the secant and tangent stiffness [...]

  • Composite materials non-linear modelling for long fibre-reinforced laminates: Continuum basis, computational aspects and validations

    F. Rastellini, S. Oller, O. Salomon, E. Oñate
    Computers and Structures (2008). Vol. 86 (9), pp. 879-896

    Abstract
    An innovative computational methodology is proposed for modelling the material non-linearmechanical behaviour of FRP structures. To model a single unidirectional composite [...]

  • A residual correction method based on finite calculus

    E. Oñate, R. Taylor, O. Zienkiewicz, J. Rojek
    Engineering Computations (2003). Vol. 20 (5-6), pp. 629-658

    Abstract
    In this paper, a residual correction method based upon an extension of the finite calculus concept is presented. The method is described and applied to the solution of a scalar [...]

  • Systemic characterization and evaluation of particle packings as initial sets for discrete element simulations

    C. Recarey Morfa, L. Cortés, M. Farias, I. Pérez, R. Valera, E. Oñate
    Comp. Part. Mech (2018). Vol. 5 (3), pp. 319-334

    Abstract
    A methodology that comprises several characterization properties for particle packings is proposed in this paper. The methodology takes into account factors such as dimension [...]

  • A finite point method for incompressible flow problems

    Computing and Visualization in Science (2000). Vol. 3 (1), pp. 67-75

    Abstract
    A stabilized finite point method (FPM) for the meshless analysis of incompressible fluid flow problems is presented. The stabilization approach is based in the finite increment [...]

  • A meshless finite point method for three‐dimensional analysis of compressible flow problems involving moving boundaries and adaptivity

    Int. J. Numer. Meth. Fluids (2013). Vol. 73 (4), pp. 323-343

    Abstract
    A finite point method for solving compressible flow problems involving moving boundaries and adaptivity is presented. The numerical methodology is based on an upwind‐biased [...]

  • Modeling incompressible flows at low and high Reynolds numbers via a finite calculus–finite element approach

    Journal of Computational Physics (2007). 224 (1), 332-351

    Abstract
    We present a formulation for incompressible flows analysis using the finite element method (FEM). The necessary stabilization for dealing with convective effects and the [...]

  • Updated Lagrangian mixed finite element formulation for quasi and fully incompressible fluids

    E. Oñate, J. Carbonell
    Computational Mechanics (2014). Vol. 54 (6), pp. 1583-1596, 2014

    Abstract
    We present a mixed velocity-pressure finite element formulation for solving the updated Lagrangian equations for quasi and fully incompressible fluids. Details of the governing [...]

  • Modelo higro-termo-mecánico para el hormigón expuesto al fuego

    D. Capua, E. Oñate
    Rev. int. métodos numér. cálc. diseño ing. (2009). Vol. 25, (4)

    Abstract
    In this paper, a hygro-thermo-mechanical model for concrete exposed to fire, based in the mechanics of unsatured porous media of Coussy, is introduced. The model state variables [...]

  • VISCOUS DAMAGE MODEL FOR TIMOSHENKO BEAM STRUCTURES

    A. Barbat, S. Oller, E. Oñate, A. Hanganu
    International Journal of Solids Structures (1997). 34(30), 3953-3976

    Abstract
    A local damage constitutive model based on Kachanov’s theory is used within a finite element frame and applied to the case of 2D and 3D Timoshenko beam elements. The [...]

  • Reliability estimation of the sheet stamping process using support vector machines

    Int. J. of Vehicle Design (2005). Vol. 39 (1-2), pp. 110–124

    Abstract
    An important concern in sheet stamping is the risk of obtaining brittle final products that can be affected by fracture. Monte Carlo simulations presented herein show that [...]

  • Possibilities of the particle finite element method for fluid–soil–structure interaction problems

    Computational Mechanics (2011). Vol. 48 (3), pp. 307-318

    Abstract
    We present some developments in the particle finite element method (PFEM) for analysis of complex coupled problems in mechanics involving fluid–soil–structure [...]

  • A methodology for adaptive mesh refinement in optimum shape design problems

    Computing Systems in Engineering (1994). Vol. 5 (1), pp. 91-102

    Abstract
    This work presents a methodology based on the use of adaptive mesh refinement (AMR) techniques in the context of shape optimization problems analyzed by the Finite Element [...]

  • A generalized streamline finite element approach for the analysis of incompressible flow problems including moving surfaces

    Comput. Methods Appl. Mech. Engrg., (1999). Vol. 173, pp. 241-255

    Abstract
    In the present work a generalized streamline finite element formulation able to deal with incompressible flow problems is presented. In the finite element framework, this [...]

  • A new formulation for air-blast fluid–structure interaction using an immersed approach. Part I: basic methodology and FEM-based simulations

    Y. Bazilevs, K. Kamran, G. Moutsanidis, D. Benson, E. Oñate
    Computational Mechanics (2017). Vol. 60 (1), pp. 83-100

    Abstract
    In this two-part paper we begin the development of a new class of methods for modeling fluid–structure interaction (FSI) phenomena for air blast. We aim to develop accurate, [...]

  • Numerical aerodynamic analysis of large buildings using a finite element model with application to a telescope building

    R. Codina, C. Morton, E. Oñate, O. Soto
    Int. J. of Num. Meths. for Heat and Fluid Flow (2000). Vol. 10 (5-6), pp. 616-633

    Abstract
    Presents a numerical strategy for the aerodynamic analysis of large buildings, with an application to the simulation of the air flow within a telescope building. The finite [...]

  • A basic thin shell triangle with only translational DOFs for large strain plasticity

    F. Flores, E. Oñate
    Int. J. Numer. Meth. Engng. (2001). Vol. 51 (1), pp. 57-83

    Abstract
    A simple finite element triangle for thin shell analysis is presented. It has only nine translational degrees of freedom and is based on a total Lagrangian formulation. Large [...]

  • Active transonic aerofoil design optimization using robust multiobjective evolutionary algorithms

    D. Lee, J. Periaux, L. González, E. Oñate, N. Qin
    Journal of Aircraft (2011). Vol. 48 (3) pp. 1084-1094

    Abstract
    The use of adaptive wing/aerofoil designs is being considered, as they are promising techniques in aeronautic/ aerospace since they can reduce aircraft emissions and improve [...]

  • An Object-oriented Environment for Developing Finite Element Codes for Multi-disciplinary Applications

    P. Dadvand, R. Rossi, E. Oñate
    Archives of Comp. Meths. Engng. (2010). Vol. 17 (3), pp 253-297

    Abstract
    The objective of this work is to describe the design and implementation of a framework for building multi-disciplinary finite element programs. The main goals are generality, [...]

  • Boundary conditions for finite element simulations of convective flows with artificial boundaries

    J. Heinrich, S. Idelsohn, E. Oñate, C. Vionnet
    Int. J. Numer. Meth. Engng. (1996). Vol. 39 (6), pp. 1053-1071

    Abstract
    We examine the use of natural boundary conditions and conditions of the Sommerfeld type for finite element simulations of convective transport in viscous incompressible flows. [...]

  • The meshless finite element method

    Int. J. Numer. Meth. Engng. (2003). Vol. 58 (6), pp. 893-912

    Abstract
    A meshless method is presented which has the advantages of the good meshless methods concerning the ease of introduction of node connectivity in a bounded time of order n, [...]

  • Benchmarks for geotechnical modeling

    E. Alarcón, E. Alonso, D. Aubry, K. Axelsson, E. Oñate
    Int. J. Numer. Meth. Engng. (1988). Vol. 26 (11), pp. 2559-2568

    Abstract
    This letter represents an initiative started by a number of researchers signed below who are working in the field of numerical modelling of soil mechanics problems. We belive [...]

  • Simple modifications for stabilization of the finite point method

    B. Boroomand, A. Tabatabaei, E. Oñate
    Int. J. Numer. Meth. Engng. (2005). Vol. 63 (3), pp. 351-379

    Abstract
    A stabilized version of the finite point method (FPM) is presented. A source of instability due to the evaluation of the base function using a least square procedure is discussed. [...]

  • Modelling of tunnelling processes and rock cutting tool wear with the particle finite element method

    Computational Mechanics (2013). Vol. 52 (3), pp. 607-629

    Abstract
    Underground construction involves all sort of challenges in analysis, design, project and execution phases. The dimension of tunnels and their structural requirements are [...]

  • Real-time micro-modelling of city evacuations

    R. Löhner, E. Haug, C. Zinggerling, E. Oñate
    Comp. Part. Mech (2018). Vol. 5 (1), pp. 71-86

    Abstract
    A methodology to integrate geographical information system (GIS) data with large-scale pedestrian simulations has been developed. Advances in automatic data acquisition and [...]

  • A plastic damage constitutive model for composite materials

    Int. J. Solids and Structures (1996). Vol. 33 (17), pp. 2501-2518

    Abstract
    In this paper a generalized elasto-plastic damage model for the analysis of multiphase frictional composite materials is presented. Details of the derivation of the secant [...]

  • A reduced-order model based on the coupled 1D-3D finite element simulations for an efficient analysis of hemodynamics problems

    Computational Mechanics (2014). Vol. 54 (4), pp. 1013-1022

    Abstract
    A reduced-order model for an efficient analysis of cardiovascular hemodynamics problems using multiscale approach is presented in this work. Starting from a patient-specific [...]

  • PFEM–DEM for particle-laden flows with free surface

    A. Franci, I. de-Pouplana, G. Casas, M. Celigueta, J. González-Usúa, E. Oñate
    Computational Particle Mechanics (2020). Vol. 7, pp. 101-120

    Abstract
    This work proposes a fully Lagrangian formulation for the numerical modeling of free-surface particle-laden flows. The fluid phase is solved using the particle finite element [...]

  • A comparison of the linear, quadratic and cubic mindlin strip elements for the analysis of thick and thin plates

    Computers and Structures (1983). Vol. 17 (3), pp. 427-439

    Abstract
    The behaviour of the linear, quadratic and cubic elements of the Mindlin plate strip family for thick and very thin plate analysis is investigated in this paper. Selective [...]

  • A finite element formulation for incompressible flow problems using a generalized streamline operator

    Comput. Methods Appl. Mech. Engrg., (1997). Vol. 143, pp. 49-67

    Abstract
    A finite element formulation for solving incompressible flow problems is presented. In this paper, the generalized streamline operator presented by Hughes et al. (Comput. [...]

  • 2D particle contact-based meshfree method in CDEM and its application in geotechnical problems

    C. Feng, S. Li, E. Oñate
    Engineering Computations (2015). Vol. 32 (4), pp. 1080-1103

    Abstract
    Purpose   – Continuum-based discrete element method is an explicit numerical method, which is a combination of block discrete element method (DEM) [...]

  • Dynamic analysis of structures using a Reissner-Mindlin finite strip formulation

    J. Canet, B. Suarez, E. Oñate
    Computers and Structures (1989). Vol. 31 (6), pp. 967-975

    Abstract
    In this paper a finite strip formulation based on Reissner-Mindlin plate theory for dynamic analysis of prismatic shell type structure is presented. Detailed expressions of [...]

  • Virtual modeling of polycrystalline structures of materials using particle packing algorithms and Laguerre cells

    C. Recarey Morfa, M. Farias, I. Pérez, E. Oñate
    Comp. Part. Mech (2018). Vol. 5 (2), pp. 213-226

    Abstract
    The influence of the microstructural heterogeneities is an important topic in the study of materials. In the context of computational mechanics, it is therefore necessary [...]

  • Mixing anisotropic formulation for analysis of composites

    S. Oller, E. Oñate, J. Canet
    Commun. Numer. Meth. Engng (1996). Vol. 12 (8), pp. 471-482

    Abstract
    A general constitutive model adequate for analysis of the thermomechanical response of composite materials is presented. The model is based on the mixture of the basic substances [...]

  • A layer-wise triangle for analysis of laminated composite plates and shells

    S. Botello, E. Oñate, J. Miquel
    Computers and Structures (1999). Vol. 70 (6), pp. 635-646

    Abstract
    The paper presents a new triangle for analysis of laminate plates and shells. The in-plane degrees of freedom are interpolated quadratically whereas a linear layer-wise approximation [...]

  • NUMISTAMP: a research project for assessment of finite-element models for stamping processes

    E. Oñate, J. Rojek, C. Garino
    Journal of Materials Processing Technology (1995). Vol. 50 (1-4), pp. 17-38

    Abstract
    This paper describes the objectives and current status of the research project NUMISTAMP currently under development at the International Center for Numerical Methods in Engineering [...]

  • Advancing front techniques for filling space with arbitrary separated objects

    R. Löhner, E. Oñate
    Finite Elements in Analysis and Design (2010). Vol. 46 (1-2), pp. 140-151

    Abstract
    A review is given of advancing front techniques for filling space with arbitrary separated objects. Over the last decade, these techniques have reached a considerable degree [...]

  • A compressible Lagrangian framework for modeling the fluid-structure interaction in the underwater implosion of an aluminum cylinder

    Mathematical Models and Methods in Applied Sciences (2013). Vol. 23 (2), pp. 339–367

    Abstract
    We propose a fully Lagrangian monolithic system for the simulation of the underwater implosion of cylindrical aluminum containers. A variationally stabilized form of the Lagrangian [...]

  • An Implicit Material Point Method Applied to Granular Flows

    Procedia Engineering (2017). Vol. 175, pp. 226-232

    Abstract
    The main objective of this work lies in the development of a variational implicit Material Point Method (MPM), implemented in the open source Kratos Multiphysics framework. [...]

  • Numerical investigation of wind-tunnel model deformations caused by the twin-sting support system

    F. Flores, E. Ortega, E. Oñate
    Journal of Aircraft (2010). Vol. 47, pp. 708-714

    Abstract
    The present work is part of a broader investigation aimed at improving the understanding of the aerodynamics of the rear aircraft section. Complex flow phenomena (e.g., [...]

  • Effect of the integration scheme on the rotation of non-spherical particles with the discrete element method

    Computational Particle Mechanics (2019). Vol. 6 (4), pp 545–559

    Abstract
    The discrete element method (DEM) is an emerging tool for the calculation of the behaviour of bulk materials. One of the key features of this method is the explicit integration [...]

  • Lagrangian finite element model for the 3D simulation of glass forming processes

    Computers and Structures (2016). 117, 126-140 (preprint)

    Abstract
    We propose here a numerical model for a three-dimensional simulation of glass forming processes. Using the basic philosophy of the Particle Finite Element method (PFEM), we [...]

  • Validation of numerical flow simulations against in vitro phantom measurements in different type B aortic dissection scenarios

    E. Soudah, P. Rudenick, M. Bordone, D. García-Dorado, A. Evangelista, E. Oñate
    Computer Methods in Biomechanics and Biomedical Engineering (2015). Vol. 18 (8), pp. 805-815

    Abstract
    An aortic dissection (AD) is a serious condition defined by the splitting of the arterial wall, thus generating a secondary lumen [the false lumen (FL)]. Its management, treatment [...]

  • Finite calculus formulation for incompressible solids using linear triangles and tetrahedra

    E. Oñate, J. Rojek, R. Taylor, O. Zienkiewicz
    Int. J. Numer. Meth. Engng. (2004). Vol. 59 (11), pp. 1473-1500

    Abstract
    Many finite elements exhibit the so‐called ‘volumetric locking’ in the analysis of incompressible or quasi‐incompressible problems.In this paper, a new approach [...]

  • Possibilities of finite calculus in computational mechanics

    Int. J. Numer. Meth. Engng. (2004). Vol. 60 (1), pp. 255-281

    Abstract
    The expression ‘finite calculus’ refers to the derivation of the governing differential equations in mechanics by invoking balance of fluxes, forces, etc. in a [...]

  • Simulation of light‐weight membrane structures by wrinkling model

    R. Rossi, M. Lazzari, R. Vitaliani, E. Oñate
    Int. J. Numer. Meth. Engng. (2005). Vol. 62 (15), pp. 2127-2153

    Abstract
    The computational challenge in dealing with membrane systems is closely connected to the lack of bending stiffness that constitutes the main feature of this category of structures. [...]

  • A mesh-free finite point method for advective-diffusive transport and fluid flow problems

    Computational Mechanics (1998). Vol. 21 (4-5), pp. 283-292

    Abstract
    The finite point method (FPM) is a gridless numerical procedure based on the combination of weighted least square interpolations on a cloud of points with point collocation [...]

  • A general formulation for coupled thermal flow of metals using finite elements

    O. Zienkiewicz, E. Oñate, J. Heinrich
    Int. J. Numer. Meth. Engng. (1981). Vol. 17 (10), pp. 1497-1514

    Abstract
    A finite element formulation to deal with the flow of metals coupled with thermal effects in presented. The deformation process of the metal is treated using the visco‐plastic [...]

  • Direct computation of instability points for contact problems

    H. Tschöpe, E. Oñate, P. Wriggers
    Computational Mechanics (2003). Vol. 31 (1-2), pp. 173–178

    Abstract
    The extended system is known as a reliable algorithm for the direct computation of instability points on the equilibrium path of mechanical structures. This article describes [...]

  • Interaction between an elastic structure and free-surface flows: experimental versus numerical comparisons using the PFEM

    Computational Mechanics (2008). Vol. 43 (1), pp. 125-132

    Abstract
    The paper aims to introduce new fluid–structure interaction (FSI) tests to compare experimental results with numerical ones. The examples have been chosen for a particular [...]

  • An integration of a low cost adaptive remeshing strategy in the solution of structural shape optimization problems using evolutionary methods

    Computers and Structures (2008). Vol. 86 (13-14), pp. 1563-1578

    Abstract
    Evolutionary methods are a powerful and robust tool for the solution of structural shape optimization problems. Nevertheless, the use of these methods requires the structural [...]

  • The extended Delaunay tessellation

    Engineering Computations (2003). Vol. 20 (5-6), pp. 583-600

    Abstract
    The extended Delaunay tessellation (EDT) is presented in this paper as the unique partition of a node set into polyhedral regions defined by nodes lying on the nearby Voronoï [...]

  • Some algorithms to correct a geometry in order to create a finite element mesh

    Computers and Structures (2002). Vol. 80 (16-17), pp. 1399-1408

    Abstract
    One of the major difficulties in meshing 3D complex geometries is to deal with non-proper geometrical definitions coming from CAD systems. Typically, [...]

  • Analysis of multifluid flows with large time steps using the particle finite element method

    S. Idelsohn, J. Marti, P. Becker, E. Oñate
    Int. J. Numer. Meth. Fluids (2014). Vol. 75 (9), pp. 621-644

    Abstract
    Multifluids are those fluids in which their physical properties (viscosity or density) vary internally and abruptly forming internal interfaces that introduce a large nonlinearity [...]

  • Advances in discrete element modelling of underground excavations

    C. Labra, J. Rojek, E. Oñate, F. Zárate
    Acta Geotechnica (2009). Vol. 3 (4), pp. 317-322

    Abstract
    The paper presents advances in the discrete element modelling of underground excavation processes extending modelling possibilities as well as increasing computational efficiency. [...]

  • Data-Based Models for the Prediction of Dam Behaviour: A Review and Some Methodological Considerations

    Archives of Comp. Meths. Engng. (2017). Vol. 24 (1), pp. 1-21

    Abstract
    Predictive models are an important element in dam safety analysis. They provide an estimate of the dam response faced with a given load combination, which can be compared [...]

  • Multiscale analysis using a coupled discrete/finite element model

    J. Rojek, E. Oñate
    Interaction and Multiscale Mechanics: An International Journal (IMMIJ) (2007). Vol. 1 (1), pp. 1-31

    Abstract
    The present paper presents multiscale modelling via coupling of the discrete and finite element methods. Theoretical formulation of the discrete element method using spherical [...]

  • Robust design optimisation of advance hybrid (fiber-metal) composite structures

    D. Lee, C. Morillo, S. Oller, G. Bugeda, E. Oñate
    Composite Structures (2013). Vol. 99, pp. 181-192

    Abstract
    Hybrid Composite Structures (HCSs) are consisting of alternating layers of Fiber-Reinforced Polymer and metal sheets. Mechanical properties and responses for off-design [...]

  • A hierarchical finite element for composite laminated beams using a refined zigzag theory

    L. Nallim, S. Oller, E. Oñate, F. Flores
    Composite Structures (2017). Vol. 163, pp. 168-184

    Abstract
    In this work a kinematics for laminated beams enriched with a refined formulation ZigZag (RZT), originally presented by Tessler et al. in 2007, introduced in a hierarchical [...]

  • Shockwaves in spillways with the particle finite element method

    Comp. Part. Mech. (2020). Vol. 7 (1), pp. 87-99

    Abstract
    Changes in direction and cross section in supercritical hydraulic channels generate shockwaves which result in an increase in flow depth with regard to that for uniform regime. [...]

  • The Pseudo-Direct Numerical Simulation method for multi-scale problems in mechanics

    Computer Methods in Applied Mechanics and Engineering (2021). Vol. 380, 113774

    Abstract
    We present an overview of the Pseudo-Direct Numerical Simulation (P-DNS in short) method for the solution of multi-scale phenomena. The method can be seen as an adaptation [...]

  • Industrial applications of sheet stamping simulation using new finite element models

    J. Rojek, J. Jovicevic, E. Oñate
    Journal of Materials Processing Technology (1996). Vol. 60 (1-4), pp. 243-247

    Abstract
    The paper is aimed to present industrial applications of sheet stamping simulation using new finite element formulations developed in the International Center for Numerical [...]

  • A hierarchical finite element method based on the partition of unity

    R. Taylor, O. Zienkiewicz, E. Oñate
    Comput. Methods Appl. Mech. Engrg., (1998). Vol. 152, pp. 73-84

    Abstract
    In this paper we consider the application of hierarchical functions to base approximations which are a partition of unity. The particular hierarchical functions used are added [...]

  • Plastic and viscoplastic flow of void‐containing metals. Applications to axisymmetric sheet forming problems

    Int. J. Numer. Meth. Engng. (1988). Vol. 25 (1), pp. 227-251

    Abstract
    A formal analogy between the equations of pure plastic and viscoplastic flow theory for void‐containing metals and those of standard non‐linear elasticity is presented. [...]

  • A hygro-thermo-mechanical constitutive model for multiphase composite materials

    Int. J. Solids and Structures (1996). Vol. 33 (20-22), pp. 3179-3186

    Abstract
    The paper describes a hygro-thermo-mechanical constitutive model appropriate for numerical simulation of multiphase composite material behaviour. The theory is based [...]

  • A compressible Lagrangian framework for the simulation of the underwater implosion of large air bubbles

    Comput. Methods Appl. Mech. Engrg., (2013). Vol. 255 (1), pp. 210-225

    Abstract
    A fully Lagrangian compressible numerical framework for the simulation of underwater implosion of a large air bubble is presented. Both air and water are considered compressible [...]

  • Parallel Delaunay triangulation for particle finite element methods

    Y. Fragakis, E. Oñate
    Commun. Numer. Meth. Engng (2008). Vol. 24 (11), pp. 1009-1017

    Abstract
    Delaunay triangulation is a geometric problem that is relatively difficult to parallelize. Parallel algorithms are usually characterized by considerable interprocessor communication [...]

  • A coupled thermomechanical model for the solidification of cast metals

    Int. J. Solids and Structures (1996). Vol. 33 (5), pp. 647-673

    Abstract
    A coupled thermomechanical model to simulate solidification problems in casting is presented. The model is formulated from a phenomenological point of view using a general [...]

  • A study of mesh optimality criteria in adaptive finite element analysis

    Engineering Computations (1993). Vol. 10 (4), pp. 307-321

    Abstract
    The concepts of solution error and optimal mesh in adaptive finite element analysis are revisited. It is shown that the correct evaluation of the convergence rate of the error [...]

  • A semi-analytical model for droplet dynamics on the GDL surface of a PEFC electrode

    A. Jarauta, M. Secanell, J. Pons Prats, P. Ryzhakov, S. Idelsohn, E. Oñate
    Int. J. Hydrogen Energy (2015). Vol. 40 (15), pp. 5375-5383 (Preprint)

    Abstract
    Water management is one of the key factors in Proton Exchange Fuel Cell (PEFC) performance. The water produced within the fuel cell is evacuated through the gas channels, [...]

  • Robust design optimization in aeronautics using stochastic analysis and evolutionary algorithms

    J. Pons-Prats, G. Bugeda, F. Zárate, E. Oñate
    Journal of Aerospace Engineering (2011). Vol. 225, (10), pp. 1131-1151

    Abstract
    Uncertainties are a daily issue to deal with in aerospace engineering and applications. Robust optimization methods commonly use a random generation of the inputs and take [...]