JOURNALS

Documents published in Scipedia

• Possibilities of the Particle Finite Element Method in computational mechanics

  E. Oñate, S. Idelsohn, M. Celigueta, R. Rossi, S. Latorre

  (2010). Computer Methods in Mechanics, M. Kuzma, K. Wilmanski (Eds.), Chapter 15, pp. 271-310., Springer-Verlag, Berlin, Heidelberg

  
  

  Abstract

  We present some developments in the formulation of the Particle Finite Element Method (PFEM) for analysis of complex coupled problems in fluid and solid mechanics accounting for fluid-structure interaction and coupled thermal effects. The PFEM uses an updated Lagrangian description to model the motion of nodes (particles) in both the fluid and the structure domains. Nodes are viewed as material points which can freely move and even separate from the main analysis domain representing, for instance, the effect of water drops. A mesh connects the nodes defining the discretized domain where the governing equations are solved as in the standard FEM. The necessary stabilization for dealing with the incompressibility of the fluid is introduced via the finite calculus (FIC) method. An incremental iterative scheme for the solution of the non linear transient coupled fluid-structure problem is described. Extensions of the PFEM to allow for frictional contact conditions at fluid-solid and solid-solid interfaces via mesh generation are described. A simple algorithm to treat erosion in the fluid bed is presented. Examples of application of the PFEM to solve a number of coupled problems such as the effect of large wave on structures, the large motions of floating and submerged bodies, bed erosion situations and melting and dripping of polymers under the effect of fire are given.

  Abstract
  We present some developments in the formulation of the Particle Finite Element Method (PFEM) for analysis of complex coupled problems in fluid and solid mechanics accounting [...]

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• Posibilidades de los métodos numéricos en obras subterráneas

  E. Oñate, B. Suarez, J. Canet

  (2007). Avances en Mecánica de Medios Continuos. Simposium en honor al Profesor J. A. Garrido García. E. Alarcon, A. Forces, F. París (Eds.), pp. 195-210

  
  

  Abstract

  Se presenta un resumen de las posibilidades de diversos métodos numéricos basados en la combinación de técnicas de elementos finitos y de partículas para la simulación de problemas típicos de obras subterráneas, tales como la excavación de túneles y la inundación de cavidades.

  Abstract
  Se presenta un resumen de las posibilidades de diversos métodos numéricos basados en la combinación de técnicas de elementos finitos y de partículas [...]

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• Finite elements versus finite volumes. Is there really a choice?

  O. Zienkiewicz, E. Oñate

  (1992). Non linear computational mechanics. State of the art. P. Wriggers,R. Wagner and E. Stein (eds.), Chapter IV, Beam, Plate and Shell Formulations, pp. 240-254, Springer Verlag

  
  

  Abstract

  The finite volume method appears to be a particular case of finite elements with a non Galerkin weighting. It is course less accurate for self adjoint problems but has some computationally useful features for first order equations involving only surface integrals. For certain problems this is a substational economy and leads to computationally useful approximations.

  Abstract
  The finite volume method appears to be a particular case of finite elements with a non Galerkin weighting. It is course less accurate for self adjoint problems but has some [...]

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• Numerical simulation of industrial sheet forming processes

  E. Oñate

  Monograph CIMNE (1993). M23

  
  

  Abstract
  This monograph presents different finite element based mathematical models and computational methods for numerical simulation of industrial sheet metal forming processes.

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• II International Workshop. Information Technologies and Computing Techniques for the Agro-Food Sector

  E. Balsa, J. Mora, J. Banga, E. Oñate

  Monograph CIMNE (2003). M86

  
  

  Abstract

  This  monographs of proceedings includes all extended abstracts, which will be presented during the AfoT. These presentations will cover a wide range of topics: - Modelling and simulation operations and process plants. - Food process optimisation, scheduling and control. - Food properties measurements and quality control. - Simulation of complex processes, for example those requiring computational fluid dynamics, CFD. - The use of new information technologies to develop decision support sytems.

  Abstract
  This  monographs of proceedings includes all extended abstracts, which will be presented during the AfoT. These presentations will cover a wide range of topics: - [...]

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• Métodos avanzados de cálculo de estructuras de materiales compuestos

  E. Oñate, S. Oller, S. Botello, J. Miquel

  Monograph CIMNE (1991). M3

  
  

  Abstract

  Se presenta una panorámica del estado del arte de los métodos más actuales para análisis de estructuras con materiales compuestos, incidiendo particularmente en los métodos para análisis de vehículos industriales como materiales compuestos

  Abstract
  Se presenta una panorámica del estado del arte de los métodos más actuales para análisis de estructuras con materiales compuestos, incidiendo particularmente [...]

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• Simulación numérica de la aerodinámica de vehículos

  J. Miquel, G. Bugeda, E. Oñate

  Monograph CIMNE (1991). M2

  
  

  Abstract

  Este trabajo analiza las posibilidades de simulación numérica del flujo aerodinámico alrededor de vehículos automotores, desde un doble punto de vista: metodología a utilizar y desarrollo de las aplicaciones que tal tipo de estudios tienen en los vehículos automotores. A lo largo del desarrollo del mismo, quedan patentes una serie de herramientas mediante las cuales es posible realizar tal tipo de simulación numérica. Dichos estudios revisten una gran importancia si se quiere conocer el comportamiento de los vehículos automotores en condiciones de operación, afectando a aspectos tan importantes como seguridad, ruido, estabilidad, consumo de combustible, ventilación, etc.

  Abstract
  Este trabajo analiza las posibilidades de simulación numérica del flujo aerodinámico alrededor de vehículos automotores, desde un doble punto de [...]

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• CFD analysis of the roll movement of a container ship

  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 based on the modification of the differential equations of the fluid dynamics (RANSE equations), including the movement of the free surface, by applying the finite calculus method. The modified equations are solved using an implicit predictor-corrector scheme and the finite element method (FEM). This resolution scheme is considered optimal for these types of problems, both in accuracy and in calculation time. As an example, it should be noted that for typical problems (more than 1,000,000 finite elements) less than 4 hours of CPU are required to solve several cycles of ship movement (Pentium IV). This allows the analysis of an array of tests in a few days or even hours, having a computer network or sufficient computing power.

  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 [...]

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• Desarrollos y aplicaciones de modelos de fractura en la escuela de ingenieros de caminos de Barcelona

  E. Oñate

  Anales de Mecánica de Fractura (2000). Vol. 17, pp. 127-154

  
  

  Abstract

  El artículo es una panorámica de los aspectos teóricos y algunas aplicaciones prácticas de los modelos de fractura desarrollados por diversos grupos en la Escuela de Ingenieros de Caminos de Barcelona (EICB) durante los últimos quince años para el análisis no lineal de estructuras. La motivación fundamental para el desarrollo de estos modelos se centra en el análisis de la seguridad de estructuras de hormigón en masa y armado. La mayor parte de los modelos se basan en la teoría de daño continuo y utilizan el método de los elementos finitos para la solución numérica. Los modelos de daño se han extendido y aplicado también con éxito al análisis de diversas estructuras de edificios históricos. Los desarrollos más recientes de estos modelos en la EICB incluyen la predicción de fenómenos de localización en estructuras de hormigón y el análisis del comportamiento no lineal de estructuras con materiales compuestos. De todos estos modelos se presentan en el artículo unas breves pinceladas, las aplicaciones más relevantes y las referencias donde pueden encontrarse los detalles sobre cada caso.

  Abstract
  El artículo es una panorámica de los aspectos teóricos y algunas aplicaciones prácticas de los modelos de fractura desarrollados por diversos grupos [...]

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• A finite element model for fluid–structure interaction problems involving closed membranes, internal and external fluids

  P. Ryzhakov, E. Oñate

  Comput. Methods Appl. Mech. Engrg., (2017). Vol. 326, pp. 422-445

  
  

  Abstract

  In this paper we propose a Finite Element model for analyzing closed membranes (“bags”) interacting with internal and external (surrounding) fluids. The approach is based on embedding a Lagrangian monolithic model describing the membrane containing an internal fluid into an Eulerian external fluid model. The combination of kinematic frameworks allows us to accurately track the location of the membrane and naturally represent flow variables discontinuities across it. In order to obtain stable coupling for membrane materials with low density, a slight fluid compressibility is assumed. The coupling between the membrane and the internal fluid is automatically accounted for by a monolithic set-up. The filled membrane and the external fluid are coupled in a Dirichlet–Neumann fashion. The model is validated in several numerical examples and its potential application to a civil engineering problem of coast protection via water-filled bag reefs is shown.

  Abstract
  In this paper we propose a Finite Element model for analyzing closed membranes (“bags”) interacting with internal and external (surrounding) fluids. The approach [...]

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Articles (Documents not available in Scipedia)

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

  J Rojek, C Labra, O Su, E Oñate

  International Journal of Solids and Structures 49 (13), 1497-1517, 2012

• A monolithic Lagrangian approach for fluid–structure interaction problems

  PB Ryzhakov, R Rossi, SR Idelsohn, E Oñate

  Computational mechanics 46 (6), 883-899, 2010

• High‐density sphere packing for discrete element method simulations

  C Labra, E Onate

  Communications in Numerical Methods in Engineering 25 (7), 837-849

• Multi-fluid flows with the particle finite element method

  S Idelsohn, M Mier-Torrecilla, E Oñate

  Computer methods in applied mechanics and engineering 198 (33), 2750-2767, 2009

• Fluid–structure interaction problems with strong added‐mass effect

  SR Idelsohn, F Del Pin, R Rossi, E Oñate

  International journal for numerical methods in engineering 80 (10), 1261-1294, 2009

• Modeling of ground excavation with the particle finite-element method

  JM Carbonell, E Oñate, B Suárez

  Journal of engineering mechanics 136 (4), 455-463, 2009

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

  SR Idelsohn, J Marti, A Souto-Iglesias, E Onate

  Computational Mechanics 43 (1), 125-132, 2008

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

  F Rastellini, S Oller, O Salomón, E Oñate

  Computers & Structures 86 (9), 879-896, 2008

• Validation of the particle finite element method (PFEM) for simulation of free surface flows

  A Larese, R Rossi, E Oñate, SR Idelsohn

  Engineering Computations 25 (4), 385-425, 2008

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

  SR Idelsohn, J Marti, A Limache, E Oñate

  Computer Methods in Applied Mechanics and Engineering 197 (19), 1762-1776, 2008

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

  E Onate, SR Idelsohn, MA Celigueta, R Rossi

  Computer Methods in Applied Mechanics and Engineering 197 (19), 1777-1800, 2008

• Multiscale analysis using a coupled discrete/finite element model

  J Rojek, E Oñate

  Interaction and Multiscale Mechanics 1 (1), 1-31, 2007

• An improved finite point method for tridimensional potential flows

  E Ortega, E Oñate, S Idelsohn

  Computational Mechanics 40 (6), 949-963, 2007

• A rotation‐free shell triangle for the analysis of kinked and branching shells

  FG Flores, E Onate

  International Journal for Numerical Methods in Engineering 69 (7), 1521-1551, 2007

• Simulation of flows with violent free surface motion and moving objects using unstructured grids

  R Löhner, C Yang, E Oñate

  International Journal for Numerical Methods in Fluids 53 (8), 1315-1338, 2007

• The ALE/Lagrangian particle finite element method: a new approach to computation of free-surface flows and fluid–object interactions

  F Del Pin, S Idelsohn, E Oñate, R Aubry

  Computers & Fluids 36 (1), 27-38, 2007

• Modeling bed erosion in free surface flows by the particle finite element method

  E Oñate, MA Celigueta, SR Idelsohn

  Acta Geotechnica 1 (4), 237-252, 2006

• FIC/FEM formulation with matrix stabilizing terms for incompressible flows at low and high Reynolds numbers

  E Oñate, A Valls, J García

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

• Finite calculus formulations for finite element analysis of incompressible flows. Eulerian, ALE and Lagrangian approaches

  E Oñate, J García, SR Idelsohn, F Del Pin

  Computer methods in applied mechanics and engineering 195 (23), 3001-3037, 2006

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

  SR Idelsohn, E Onate

  Computer methods in applied mechanics and engineering 195 (37), 4681-4696, 2006

• On the simulation of flows with violent free surface motion

  R Löhner, C Yang, E Oñate

  Computer Methods in Applied Mechanics and Engineering 195 (41), 5597-5620, 2006

• Fluid–structure interaction using the particle finite element method

  SR Idelsohn, E Onate, F Del Pin, N Calvo

  Computer Methods in Applied Mechanics and Engineering 195 (17), 2100-2123, 2006

• Simple modifications for stabilization of the finite point method

  B Boroomand, AA Tabatabaei, E Onate

  International Journal for Numerical Methods in Engineering 63 (3), 351-379, 2005

• A continuum mechanics model for mechanical fatigue analysis

  S Oller, O Salomón, E Oñate

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

• Simulation of light‐weight membrane structures by wrinkling model

  R Rossi, M Lazzari, R Vitaliani, E Oñate

  International Journal for Numerical Methods in Engineering 62 (15), 2127-2153, 2005

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

  FG Flores, E Onate

  Computer Methods in Applied Mechanics and Engineering 194 (6), 907-932, 2005

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

  R Aubry, SR Idelsohn, E Oñate

  Computers & structures 83 (17), 1459-1475, 2005

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

  E Oñate, FG Flores

  Computer methods in applied mechanics and engineering 194 (21), 2406-2443, 2005

• A general advancing front technique for filling space with arbitrary objects

  R Löhner, E Oñate

  International journal for numerical methods in engineering 61 (12), 1977-1991, 2004

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

  E Oñate, J Rojek, RL Taylor, OC Zienkiewicz

  International Journal for Numerical Methods in Engineering 59 (11), 1473-1500, 2004

• Possibilities of finite calculus in computational mechanics

  E Oñate

  International journal for numerical methods in engineering 60 (1), 255-281, 2004

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

  E Onate, J Rojek

  Computer methods in applied mechanics and engineering 193 (27), 3087-3128, 2004

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

  SR Idelsohn, E Oñate, FD Pin

  International journal for numerical methods in engineering 61 (7), 964-989, 2004

• The particle finite element method—an overview

  E Oñate, SR Idelsohn, F Del Pin, R Aubry

  International Journal of Computational Methods 1 (02), 267-307, 2004

• A residual correction method based on finite calculus

  E Oñate, RL Taylor, OC Zienkiewicz, J Rojek

  Engineering Computations 20 (5/6), 629-658, 2003

• The extended Delaunay tessellation

  N Calvo, SR Idelsohn, E Oñate

  Engineering Computations 20 (5/6), 583-600, 2003

• Polyhedrization of an arbitrary 3D point set

  SR Idelsohn, N Calvo, E Onate

  Computer Methods in Applied Mechanics and Engineering 192 (22), 2649-2667, 2003

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

  SR Idelsohn, E Onate, F Del Pin

  Computers & Structures 81 (8), 655-671, 2003

• The meshless finite element method

  SR Idelsohn, E Onate, N Calvo, F Del Pin

  International Journal for Numerical Methods in Engineering 58 (6), 893-912, 2003

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

  E Car, F Zalamea, S Oller, J Miquel, E Oñate

  International Journal of Solids and Structures 39 (7), 1967-1986, 2002

• A finite element methodology for local/global damage evaluation in civil engineering structures

  AD Hanganu, E Onate, AH Barbat

  Computers & Structures 80 (20), 1667-1687, 2002

• A finite point method for compressible flow

  R Löhner, C Sacco, E Onate, S Idelsohn

  International Journal for Numerical Methods in Engineering 53 (8), 1765-1779, 2002

• A large strain plasticity model for anisotropic materials—composite material application

  E Car, S Oller, E Oñate

  International Journal of Plasticity 17 (11), 1437-1463, 2001

• Lagrangian formulations to solve free surface incompressible inviscid fluid flows

  SR Idelsohn, MA Storti, E Oñate

  Computer Methods in Applied Mechanics and Engineering 191 (6), 583-593, 2001

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

  FG Flores, E Onate

  International Journal for numerical methods in engineering 51 (1), 57-83, 2001

• A finite element method for fluid–structure interaction with surface waves using a finite calculus formulation

  E Oñate, J Garcıa

  Computer methods in applied mechanics and engineering 191 (6), 635-660, 2001

• A finite point method for elasticity problems

  E Oñate, F Perazzo, J Miquel

  Computers & Structures 79 (22), 2151-2163, 2001

• Stabilization techniques for finite element analysis of convection-diffusion problems

  E Oñate, M Manzan

  Developments in Heat Transfer 7, 71-118, 2000

• An anisotropic elastoplastic constitutive model for large strain analysis of fiber reinforced composite materials

  E Car, S Oller, E Oñate

  Computer Methods in Applied Mechanics and Engineering 185 (2), 245-277, 2000

• A simple method for automatic update of finite element meshes

  G Chiandussi, G Bugeda, E Oñate

  Communications in Numerical Methods in Engineering 16 (1), 1-19, 2000

• A finite point method for incompressible flow problems

  E Oñate, C Sacco, S Idelsohn

  Computing and visualization in science 3 (1-2), 67-75, 2000

• Rotation-free triangular plate and shell elements

  E Onate, F Zarate

  International Journal for Numerical Methods in Engineering 47 (1-3), 557-603, 2000

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

  E Onate

  Computer methods in applied mechanics and engineering 182 (3), 355-370, 2000

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

  MA Cruchaga, E Oñate

  Computer Methods in Applied Mechanics and Engineering 173 (1), 241-255, 1999

• A general procedure for deriving stabilized space–time finite element methods for advective–diffusive problems

  E Oñate, M Manzan

  International Journal for Numerical Methods in Fluids 31 (1), 203-221, 1999

• A homogeneous constitutive model for masonry

  J Lopez, S Oller, E Onate, J Lubliner

  International journal for numerical methods in engineering 46 (10), 1651-1671, 1999

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

  J Rojek, E Onate, E Postek

  Journal of Materials Processing Technology 80, 620-627, 1998

• An advancing front point generation technique

  R Löhner, E Onate

  Communications in numerical methods in engineering 14 (12), 1097-1108, 1998

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

  RL Taylor, OC Zienkiewicz, E Oñate

  Computer Methods in Applied Mechanics and Engineering 152 (1), 73-84, 1998

• Experimental and numerical issues in the modelling of the mechanical behaviour of masonry

  P Roca, JL González, E Oñate, PB Lourenço

  Structural Analysis of Historical Constructions II. CIMNE, Barcelona, 1998

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

  E Onate, S Idelsohn

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

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

  E Oñate

  Computer Methods in Applied Mechanics and Engineering 151 (1), 233-265, 1998

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

  MA Cruchaga, E Oñate

  Computer Methods in Applied Mechanics and Engineering 143 (1), 49-67, 1997

• Viscous damage model for Timoshenko beam structures

  AH Barbat, S Oller, E Oñate, A Hanganu

  International Journal of Solids and Structures 34 (30), 3953-3976, 1997

• A plastic damage constitutive model for composite materials

  S Oller, E Oñate, J Miquel, S Botello

  International journal of Solids and Structures 33 (17), 2501-2518, 1996

• An unstructured grid-based, parallel free surface solver

  R Löhner, C Yang, E Oñate, S Idelssohn

  Centro Internacional de Métodos Numéricos en Ingeniería, 1996

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

  E Onate, S Idelsohn, OC Zienkiewicz, RL Taylor, C Sacco

  Computer Methods in Applied Mechanics and Engineering 139 (1), 315-346, 1996

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

  E Onate, S Idelsohn, OC Zienkiewicz, RL Taylor

  International journal for numerical methods in engineering 39 (22), 3839-3866, 1996

• Moving least square approximations for solution of differential equations

  RL Taylor, OC Zienkiewicz, E Oñate, S Idelsohn

  Centro Internacional de Métodos Numéricos en Ingeniería, 1995

• Cálculo de estructuras por el método de elementos finitos: análisis elástico lineal

  E Oñate

  Centro Internacional de Métodos Numéricos en Ingeniería, 1992

• Plastic Flow in Metal Forming. I.--Coupled Thermal. II.--Thin Sheet Forming

  DC Zienkiewicz, E Onate, JC Heinrich

  Applications of Numerical Methods to Forming Processes, 107-120, 1978