• B. Boroomand, A. Barekatein
    (2006). Research Report, Nº PI298

    Abstract
    In this report we propose a stabilization method for topology optimization of planes. The method can be classified in the category of continuation methods. The new continuation [...]

  • N. Parés, P. Díez, A. Huerta
    (2006). Research Report, Nº PI297

    Abstract
    Classical implicit residual type error estimators require using an underlying spatial finer mesh to compute bounds for some quantity of interest. Consequently, the bounds [...]

  • (2006). Research Report, Nº PI296

    Abstract
    This paper recovers the original spirit of the continuous crack approaches, where displacements jumps across the crack are smeared over the affected elements and the behaviour [...]

  • M. Cervera, M. Chiumenti
    (2006). Research Report, Nº PI294

    Abstract
    This paper describes a procedure for the solution of problems involving tensile cracking using the so-called smeared crack approach, that is, standard finite elements [...]

  • (2006). Research Report, Nº PI293

    Abstract
    We present a general formulation for modeling bed erosion in free surface flows using the particle finite element method (PFEM). The key feature of the PFEM is the use of [...]

  • (2006). Research Report, Nº PI292

    Abstract
    El objetivo de este trabajo es obtener una formulación constitutiva general que permita representar el comportamiento –crecimiento y decrecimiento natural / patológico, [...]

  • Y. Fragakis
    (2006). Research Report, Nº PI291

    Abstract
    In recent years, Domain Decomposition Methods (DDM) have emerged as advanced solvers in several areas of computational mechanics. In particular, during the last decade, in [...]

  • Y. Fragakis
    (2006). Research Report, Nº PI290

    Abstract
    In recent years, Domain Decomposition Methods (DDM) have emerged as advanced solvers in several of computational mechanics. In particular, during the last decade, in the area [...]

  • (2006). Research Report, Nº PI289

    Abstract
    In this paper we present a stabilized finite element formulation to solve the Oseen equations as a model problem involving both convection effects and the incompressibility [...]

  • S. Badia, R. Codina
    (2006). Research Report, Nº PI287

    Abstract
    In this paper we suggest some algorithms for the fluid-structure interaction problem stated using a domain decomposition framework. These methods involve stabilized pressure [...]

  • S. Badia, R. Codina
    (2006). Research Report, Nº PI285

    Abstract
    In this paper we analyze a stabilized finite element method to approximate the convection diffusion equation on moving domains using an ALE framework. As basic numerical strategy, [...]

  • R. Codina, S. Badia
    (2006). Research Report, Nº PI284

    Abstract
    In this paper we treat several aspects related to time integration methods for the incompressible Navier-Stokes equations that allow to uncouple the calculation of the velocities [...]

  • E. Oñate, C. Felippa
    (2006). Research Report, Nº PI283

    Abstract
    We present a variational formulation of the finite calculus (FIC) equations for problems in mechanics governed by differential equations with symmetric operators. Applications [...]

  • (2006). Research Report, Nº PI282

    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 [...]

  • R. Löhner, C. Yang, E. Oñate
    (2006). Research Report, Nº PI281

    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 [...]

  • J. Arteaga-Gomez, R. Löhner, J. Rojek, E. Oñate
    (2006). Research Report, Nº PI280

    Abstract
    This paper describes the coupling of FEFLO, a general purpose compressible and incompressible flow solver base on adaptive unstructured grids with SIMPACT, a general purpose, [...]

  • (2007). Research Report, Nº PI312

    Abstract
    El CIMNE (www.cimne.com), un centre de recerca consorci entre la Universitat Politècnica de Catalunya i la Generalitat de Catalunya, fa vint anys. El CIMNE està [...]

  • K. Lam
    (2007). Research Report, Nº PI307

    Abstract
    This report investigates the free surface capture of the Overlapping Domain Decomposition Level Set Method (ODDLS). The CFD software Tdyn is used to carry out computations [...]

  • A. Daring, R. López, R. Flores, G. Bugeda, E. Oñate
    (2007). Research Report, Nº PI306

    Abstract
    An optimization methodology based on neural networks was developed for use in 2D optimal shape design problems. Neural networks were used as a parameterization scheme to represent [...]

  • (2007). Research Report, Nº PI304

    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 [...]

  • E. Oñate, F. Flores, L. Neamtu
    (2007). Research Report, Nº PI302

    Abstract
    An enhanced rotation-free three node triangular shell element (termed EBST) is presented. The element formulation is based on a quadratic interpolation of the geometry in [...]

  • E. Oñate, F. Flores, J. Marcipar
    (2007). Research Report, Nº PI303

    Abstract
    This paper shows applications of a recently developed thin shell element adequate for the analysis of membrane and inflatable structures. The element is a three node triangle [...]

  • R. Sevilla, S. Fernández-Méndez, A. Huerta
    (2007). Research Report, Nº PI309

    Abstract
    In this work the NURBS-Enhanced Finite Element Method (NEFEM) is combined with a Discontinuous Galerkin (DG) formulation for the numerical solution of the Euler equations [...]

  • R. Sevilla, S. Fernández-Méndez, A. Huerta
    (2007). Research Report, Nº PI308

    Abstract
    An improvement of the classical finite element method is proposed. It is able to exactly represent the geometry by means of the usual CAD description of the boundary with [...]

  • E. Oñate, B. Suárez, J. Canet
    (2007). Research Report, Nº PI301

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

  • A. Barbat, L. Pujades, O. Cardona
    (2007). Research Report, Nº PI300

    Abstract
    En este informe se estudian los métodos numéricos orientados hacia el cálculo de la seguridad de las estructuras, a la evaluación de su vulnerabilidad [...]

  • N. Parés, P. Díez, A. Huerta
    (2007). Research Report, Nº PI299

    Abstract
    The paper introduces a methodology to compute upper and lower bounds for linear-functional outputs of the exact solutions of parabolic problems. In this second part, the bounds [...]

  • M. Kouhi, E. Oñate, G. Bugeda
    (2008). Research Report, Nº PI328

    Abstract
    This document is an introduction to some important methodologies that have been developed in robust design in aerospace engineering. After describing the concept of robustness [...]

  • R. Rossi, E. Oñate, A. Maymó
    (2008). Research Report, Nº PI327

    Abstract
    This diploma thesis deals with the implementation of a fluid solver for incompressible and compressible flows within the multi-physics framework Kratos. The presentation of [...]

  • R. Flores, E. Ortega
    (2008). Research Report, Nº PI326

    Abstract
    The PUMI flow solver has been developed at CIMNE in to address the need for fast solutions of the flow field around complex geometries. Nowadays calculations involving a number [...]

  • D. Chemisana, J. Cipriano, M. Ibáñez, B. Mesih, A. Mellor
    (2008). Research Report, Nº PI325

    Abstract
    This paper presents the thermal evaluation of an evacuated PVT collector designed to operate under concentrated radiation (15 suns). Finite volume 3D numerical computations [...]

  • (2008). Research Report, Nº PI323

    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 [...]

  • Z. Tang, J. Periaux, G. Bugeda, E. Oñate
    (2008). Research Report, Nº PI322

    Abstract
    In this paper, the aerodynamic shape optimization problems with uncertain operating conditions has been addressed. After a review of robust control theory and the possible [...]

  • M. Bordone, E. Oñate, E. Soudah, M. Chiumenti
    (2008). Research Report, Nº PI317

    Abstract
    Las enfermedades cardiovasculares son la primera causa de muerte de la población Europea. Se estima que la mortalidad por enfermedades cardiovasculares es la mitad [...]

  • (2008). Research Report, Nº PI316

    Abstract
    En este informe se describen algunos de los desarrollos recientes en modelos constitutivos avanzados para el comportamiento no lineal de materiales de construcción. [...]

  • J. Cipriano, C. Lodi, D. Chimisana, G. Houzeaux, O. Perpiñan
    (2008). Research Report, Nº PI324

    Abstract
    This research aims at developing new standardized typologies of semitransparent double skin façades formed by PV laminates in the outer skin. At present there are many [...]

  • W. Castelló, F. Flores
    (2008). Research Report, Nº PI329

    Abstract
    Este informe presenta los avances logrados en la implementación dentro del código Stampack, de un modelo constitutivo elasto-viscoplástico del tipo de [...]

  • C. Estrada, F. Flores
    (2008). Research Report, Nº PI330

    Abstract
    El contenido de este informe semestral es el siguiente. En la Sección 3 se presentan los aspectos básicos de la formulación original del elemento BSQ. [...]

  • X. Oliver
    (2009). Research Report, Nº PI338

  • Z. Tang, J. Périaux, E. Oñate, G. Bugeda
    (2008). Research Report, Nº PI314

    Abstract
    In this paper, the aerodynamic shape optimization problems with uncertain operating conditions have been addressed. After a review of robust control theory and the possible [...]

  • M. Cervera, M. Chiumenti
    (2009). Research Report, Nº PI331

    Abstract
    This paper studies the phenomenon of structural size effect and strain localization in J2 plasticity. Size effect is here understood as the change in the response of a given [...]

  • A. Jarauta, J. Pons Prats
    (2009). Research Report, Nº PI340

  • C. Buachart, E. Ortega, E. Oñate
    (2009). Research Report, Nº PI337

  • J. Rojek, E. Oñate, C. Labra, H. Kazal, J. Akerman
    (2009). Research Report, Nº PI336

    Abstract
    This paper presents an original thermomechanical model of rock cutting with evaluation of tool wear. The model has been developed within the framework of the discrete element [...]

  • K. Lau, R. López, E. Oñate
    (2009). Research Report, Nº PI335

    Abstract
    A neural network noise prediction model for a turbulent boundary layer noise mechanism has been created using a feed forward multilayer perceptron and a noise spectrum database [...]

  • (2009). Research Report, Nº PI333

    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 [...]

  • R. Flores, E. Ortega, E. Oñate
    (2009). Research Report, Nº PI334

    Abstract
    This work presents a wing deformation analysis of a twin-sting-mounted commercial aircraft model. Twin-sting arrangements minimize flow disturbances around the model fuselage [...]

  • E. Ortega, R. Flores, E. Oñate
    (2010). Research Report, Nº PI343

    Abstract
    An unsteady low-order panel method for three-dimensional subsonic analyses is presented. The method, which is based on well-established techniques in computational aerodynamics, [...]

  • M. Mier-Torrecilla, S. Idelsohn, E. Oñate
    (2010). Research Report, Nº PI342

    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 [...]

  • (2010). Research Report, Nº PI347

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

  • (2010). Research Report, Nº PI346

    Abstract
    The so-called zigzag theory has been developed in recent years as an extension of the classical layer-wise theory for modeling composite laminated beams, plates and shells. [...]

  • R. Hernández, A. Larese, E. Oñate
    (2010). Research Report, Nº PI348

    Abstract
    Actualmente las presas de materiales sueltos son la tipología cuya elección es más frecuente debido, en parte, a los grandes avances que se han hecho [...]

  • M. Cervera, M. Chiumenti, D. Di Capua
    (2011). Research Report, Nº PI370

    Abstract
    This paper studies the phenomenon of strain bifurcation and localization in J2 plasticity under plane stress and plane strain conditions. Necessary conditions for the outcome [...]

  • Research Report (2017). PI417

    Abstract
    We present an overview of the model implemented by the International Centre for Numerical Methods in Engineering (CIMNE, www.cimne.com ) for  the generation of scientific [...]

  • B. Movahedian, B. Boroomand
    (2011). Research Report, Nº PI364

    Abstract
    In this research we present a method based on using Exponential Basis Functions (EBFs) to solve a class of time dependent engineering problems. The solution is first approximated [...]

  • S. Zandi, B. Boroomand, S. Soghrati
    (2011). Research Report, Nº PI363

    Abstract
    In this report, a new simple meshless method is presented for the solution of incompressible inviscid fluid flow problems with moving boundaries. A Lagrangian formulation [...]

  • W. Castelló, F. Flores
    (2011). Research Report, Nº PI362

    Abstract
    El objetivo principal del presente informe es mostrar las mejoras en la performance del código Stampack, cuando se lo emplea en conjunto con OpenMP en máquinas [...]

  • M. Pasenau, C. Andújar
    (2011). Research Report, Nº PI361

    Abstract
    El objetivo principal del proyecto de fin de carrera es el análisis, diseño, implementación y prueba de un algoritmo que permita simplificar rápidamente [...]

  • (2011). Research Report, Nº PI357

    Abstract
    We present some developments in the Particle Finite Element Method (PFEM) for analysis of complex coupled problems in mechanics involving fluid-soil-structure interaction [...]

  • E. Oñate
    (2011). Research Report, Nº PI354

    Abstract
    Cuando se habla de la investigación, el desarrollo tecnológico y la innovación (I+D+I en siglas, que yo escribo todas en mayúsculas [1]) es frecuente [...]

  • M. Shahbazi, B. Boroomand, S. Soghrati
    (2011). Research Report, Nº PI353

    Abstract
    In this report, we introduce a meshfree approach for static analysis of isotropic/orthotropic crossply laminated plates with symmetric/non-symmetric layers. Classical, first [...]

  • R. Flores, E. Ortega, R. López
    (2012). Research Report, Nº PI375

    Abstract
    This work, conducted at CIMNE under ALEF project task 1.2.3, presents an investigation about the potential capabilities of neural networks to assist simulation campaigns. [...]

  • A. Eijo, E. Oñate, S. Oller
    (2012). Research Report, Nº PI378

    Abstract
    A new bilinear 4-noded quadrilateral element (called QLRZ) for the analysis of composite laminated and sandwich plates/shells based on the refined zigzag theory (RZT) proposed [...]

  • C. Estruch, B. Suárez, J. Marcipar
    (2012). Research Report, Nº PI380

    Abstract
    Actualmente el espacio formado por el “Parc Mediterrani de la Tecnologia” y el Campus Universitario de la Universitat Politècnica de Catalunya (PMT-UPC) [...]

  • M. Santasusana, E. Oñate
    (2012). Research Report, Nº PI381

    Abstract
    The Discrete Element Method is a relatively new technique that has nowadays and intense research in the field of numerical methods. In its first conception, the method was [...]

  • D. Modesto, S. Zlotnik, A. Huerta
    (2013). Research Report, Nº PI401

    Abstract
    Solving the Helmholtz equation for a large number of input data in an heterogeneous media and unbounded domain still represents a challenge. This is due to the particular [...]

  • A. Llanos, E. Oñate, F. Zárate
    (2013). Research Report, Nº PI398

    Abstract
    Actualmente existen programas de MAT-fem para calcular vigas de material homogéneo, según la teoría de Euler-Bernoulli o de Timoshenko. El objetivo de [...]

  • P. Nadukandi
    (2014). Research Report, Nº PI408

    Abstract
    We present numerically stable formulas for the analytical solution in the closed form of the so-called X-IVAS scheme in 3D. The X-IVAS scheme is a material point based [...]

  • E. Ortega, R. Flores
    (2016). Research Report, Nº PI415

    Abstract
    PARACHUTES is a computer program developed at the International Center for Numerical Methods in Engineering (CIMNE) for the simulation of ram-air (gliding) parachute systems. The [...]

  • (2011). Research Report, Nº PI359

    Abstract
    Se presentan unas reflexiones sobre el ciclo que las ideas recorren desde que surgen en un entorno universitario hasta que se transforman en un producto industrial. Se concretan [...]

  • B. Boroomand, B. Khalilian
    (2004). Research Report, Nº PI248

    Abstract
    In this paper a simple iterative method is presented for finite element solution of incompressible plane strain problems using linear elements. Instead of using a mixed formulation [...]

  • B. Boroomand, M. Ghaffarian, O. Zienkiewicz
    (2004). Research Report, Nº PI247

    Abstract
    In this paper a study is performed on application of two recovery methods, i.e. Superconvergent Patch Recovery (SPR) and the Recovery by Equilibrium of Patches (REP), to plate [...]

  • B. Boroomand, A. Tabatabaie, E. Oñate
    (2004). Research Report, Nº PI249

    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. [...]

  • B. Boroomand, F. Mossaiby
    (2004). Research Report, Nº PI250

    Abstract
    In this part of the paper we shall use the formulation given in the first part to assess the quality of recovery based error estimators using two recovery methods, i.e. Superconvergent [...]

  • J. Valdés
    (2004). Research Report, Nº PI266

    Abstract
    Avances en el análisis mediante elementos finitos de membranas curvas con ''wrinkling''  sujetas a grandes desplazamientos son presentados. Este [...]

  • E. Ortega, R. Flores, E. Oñate, C. Sacco, E. González
    (2010). Research Report, Nº PI341

    Abstract
    The design and evaluation of parachute-payload systems is an important field of applications in which numerical analysis tools can make very important contributions. This [...]

  • E. Oñate, B. Suárez, F. Salazar, R. Morán, M. Celigueta, S. Latorre
    (2011). Research Report, Nº PI365

    Abstract
    Se describen los conceptos básicos del método de partículas y elementos finitos (PFEM) para análisis de flujos de fluidos en lámina libre [...]

  • E. Ortega, E. Oñate, S. Idelsohn
    (2011). Research Report, Nº PI368

    Abstract
    An adaptive Finite Point Method (FPM) for solving aeroelastic compressible flow problems is presented. The numerical methodology is based on a meshless upwind-biased discretization [...]

  • E. Oñate, S. Idelsohn, F. Pin, R. Aubry
    (2004). Research Report, Nº PI243

    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 [...]

  • E. Oñate, J. Marcipar, J. Piazzese
    (2003). Research Report, Nº PI238

    Abstract
    La eclosión de las Tecnologías de la Información y las Comunicaciones (TIC), y en particular de Internet, ha facilitado el desarrollo de sistemas que, [...]

  • H. Koszur
    (2015). Research Report, Nº PI412

    Abstract
    The main objective of this document is to present an idea of calibration tests used to improve an input material model in the DEM simulations in the D-DEMPack package programme [...]

  • E. Oñate, F. Flores
    (2003). Research Report, Nº PI241

    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 [...]

  • E. Oñate, J. Carbonell
    (2013). Research Report, Nº PI393

    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 [...]

  • E. Oñate, J. Miquel, F. Zárate
    (2005). Research Report, Nº PI269

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

  • E. Oñate, M. Celigueta, S. Latorre, G. Casas, R. Rossi, J. Rojek
    (2014). Research Report, Nº PI405

    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 [...]

  • M. Font, E. Oñate, J. Carbonell
    (2011). Research Report, Nº PI366

    Abstract
    El deflectòmetre d’impacte segurament és l’aparell més utilitzat per realitzar assaigs no destructius dels ferms. Els enginyers utilitzen [...]

  • J. Mora, R. Otín, P. Dadvand, E. Escolano, M. Pasenau, E. Oñate
    (2005). Research Report, Nº PI273

    Abstract
    Computational electromagnetism requires a wide range of numerical methods depending on the application, the topology of the geometry, the frequency and the quality of the [...]

  • E. Oñate, A. Franci, J. Carbonell
    (2014). Research Report, Nº PI406

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

  • E. Oñate, M. Celigueta, S. Idelsohn, F. Salazar, A. Larese, R. Rossi, B. Suárez, R. Morán
    (2012). Research Report, Nº PI374

    Abstract
    We present some developments in the Particle Finite Element Method (PFEM) for analysis of coupled problems in mechanics involving fluid-soil-structure interaction (FSSI). [...]

  • B. Llacay, G. Peffer
    (2004). Research Report, Nº PI260

    Abstract
    Recently, some authors have warned of the increasingly widespread use of risk management techniques by financial institutions, arguing that this can cause the market to become [...]

  • E. González, C. Sacco, E. Ortega, R. Flores
    (2011). Research Report, Nº PI356

    Abstract
    The role parachutes have in many civil, humanitarian and military applications call for new and improved computational tools aimed at tackling the current lack of software [...]

  • R. Flores, E. Ortega, E. Oñate
    (2011). Research Report, Nº PI351

    Abstract
    An explicit dynamic structural solver developed at CIMNE for the analysis of parachutes is presented. The canopy fabric has a negligible out-of-plane stiffness, therefore [...]

  • E. Oñate, C. Labra, F. Zárate, J. Rojek
    (2012). Research Report, Nº PI373

    Abstract
    We present a new computational model for predicting the effect of blast loading on structures. The model is based in the adaptive coupling of the finite element method (FEM) [...]

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