Ara es mostren els items 226-245 de 390

    • Global search methods for nonlinear optimisation: a new probabilistic-stochastic approach 

      Bugeda Castelltort, Gabriel; Balsa-Canto, E; Thamotheram, C; Oñate Ibáñez de Navarra, Eugenio; Zárate Araiza, José Francisco (International Centre for Numerical Methods in Engineering (CIMNE), 2003)
      Text en actes de congrés
      Accés obert
      In this work the problem of overcoming local minima in the solution of nonlinear optimisation problems is addressed. As a first step, the existing nonlinear local and global optimisation methods are reviewed so as to ...
    • Implementation of a general algorithm for incompressible and compressible flows within the multi-physics code KRATOS and preparation of fluid-structure coupling 

      May, M.; Rossi, Riccardo; Oñate Ibáñez de Navarra, Eugenio (2008-11)
      Report de recerca
      Accés obert
      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 this environment based on the finite element ...
    • Incompressible Lagrangian fluid flow with thermal coupling 

      Aubry, Romain; Idelsohn Barg, Sergio Rodolfo; Oñate Ibáñez de Navarra, Eugenio (International Centre for Numerical Methods in Engineering (CIMNE), 2007)
      Llibre
      Accés obert
      In this monograph is presented a method for the solution of an incompressible viscous fluid flow with heat transfer and solidification usin a fully Lagrangian description on the motion. The originality of this method ...
    • Interaction between an elastic structure and free-surface flows: experimental versus numerical comparisons using the PFEM 

      Idelsohn Barg, Sergio Rodolfo; Marti, J.; Souto Iglesias, Antonio; Oñate Ibáñez de Navarra, Eugenio (2008-12)
      Article
      Accés obert
      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 case for which experimental results are not much ...
    • Interpretation of dam deformation and leakage with boosted regression trees 

      Salazar González, Fernando; Toledo Municio, Miguel Ángel; Oñate Ibáñez de Navarra, Eugenio; Suárez Arroyo, Benjamín (2016-07)
      Article
      Accés obert
      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 tools are well known to have limitations in ...
    • Introduction to the finite element method 

      Oñate Ibáñez de Navarra, Eugenio; Díez, Pedro; Zárate Araiza, José Francisco; Larese De Tetto, Antonia (Universitat Politècnica de Catalunya, 2008-10)
      Apunts
      Accés obert
    • Lagrangian analysis of multiscale particulate flows with the particle finite element method 

      Oñate Ibáñez de Navarra, Eugenio; Celigueta Jordana, Miguel Ángel; Latorre Sánchez, Juan Salvador; Casas González, Guillermo; Rossi, Riccardo; Rojek, Jerzy (Springer, 2014-05)
      Article
      Accés obert
      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 finite element method (PFEM) which blends concepts ...
    • Lagrangian FE methods for coupled problems in fluid mechanics 

      Ryzhakov, Pavel; Oñate Ibáñez de Navarra, Eugenio; Rossi, Riccardo; Idelsohn Barg, Sergio Rodolfo (International Centre for Numerical Methods in Engineering (CIMNE), 2010)
      Llibre
      Accés obert
      This work aims at developing formulations and algorithms where maximum advantage of using Lagrangian finite element fluid formulations can be taken. In particular we concentrate our attention at fluid-structure interaction ...
    • Lagrangian finite element model for the 3D simulation of glass forming processes 

      Ryzhakov, Pavel; García Espinosa, Julio; Oñate Ibáñez de Navarra, Eugenio (2016-12)
      Article
      Accés obert
      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 introduce several new features adapting the ...
    • Lagrangian versus Eulerian integration errors 

      Idelsohn Barg, Sergio Rodolfo; Oñate Ibáñez de Navarra, Eugenio; Nigro, Norberto; Becker, Pablo Agustín; Gimenez, Juan Marcelo (2015-08)
      Article
      Accés obert
      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 fluids and also for solving multi-fluid ...
    • Large-scale simulation of flows with violent free surface motion 

      Löhner, R; Yang, C; Oñate Ibáñez de Navarra, Eugenio (2005)
      Text en actes de congrés
      Accés obert
      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 the interactions of extreme waves and three-dimensional ...
    • Las herramientas numéricas y la práctica profesional en ingeniería civil 

      Suárez Arroyo, Benjamín; Oñate Ibáñez de Navarra, Eugenio; Ribó, R (2002-02)
      Article
      Accés obert
      Se presentan en este artículo unas reflexiones sobre los métodos numéricos, su evolución y la problemática que plantea su aplicación a problemas de ingeniería real, es decir en la práctica profesional del ingeniero. Se ...
    • Lectures on nonlinear finite element analysis of concrete shells 

      Oñate Ibáñez de Navarra, Eugenio (International Centre for Numerical Methods in Engineering (CIMNE), 1992)
      Llibre
      Accés obert
      This monograph presents 4 lectures on non linear analysis of concrete shells by the finite element method. The lectures were prepared by the author for the course on "Non linear analysis of shells by finite elements" held ...
    • LES turbulence Models: relation with stabilized numerical methods 

      Valls Molina, Antonio; García Espinosa, Julio; Oñate Ibáñez de Navarra, Eugenio (2006-05)
      Report de recerca
      Accés obert
      Abstract One of the aims of this text is to show some important results in LES modelling and to identify which are main mathematical problems for the development of a complete theory. A relevant aspect of LES theory, which ...
    • Lift maximization with uncertainties for high lift devices optimization 

      Tang, Z.; Periaux, Jacques Francis; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio (2008-10)
      Report de recerca
      Accés obert
      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 approaches to take into account uncertainties, the ...
    • Lift maximization with uncertainties for the optimization of high-lift devices 

      Zhili, Tang; Periaux, Jacques; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio (2010-09)
      Article
      Accés obert
      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 approaches to take into account uncertainties, ...
    • Líneas de investigación de la cátedra de estructuras de la Escuela Técnica Superior de Ingenieros de Caminos, Canales y Puertos de la Universidad Politécnica de Barcelona 

      Oñate Ibáñez de Navarra, Eugenio (Universitat Politècnica de Barcelona, 1980-12)
      Text en actes de congrés
      Accés obert
      Se presenta un breve resumen de las actividades de investigación de la Cátedra de Estructuras de la E.T.S.I.C.C.P.- U.P B. La mayor parte de las mismas están relacionadas con el método de los elementos finitos (ZIENKIEWICZ ...
    • Mejora de la solución fuertemente acoplada de problemas FSI mediante una aproximación de la matriz tangente de presión 

      Rossi, Riccardo; Idelsohn Barg, Sergio Rodolfo; Oñate Ibáñez de Navarra, Eugenio; Cotela Dalmau, Jordi; Del Pin, F. (Universitat Politècnica de Catalunya. CIMNE, 2011-01)
      Article
      Accés obert
      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 se proporciona una explicación teórica simple de los ...
    • Melting and spread of polymers in fire with the particle finite element method 

      Oñate Ibáñez de Navarra, Eugenio; Rossi, Riccardo; Butler, Kathryn M.; Idelsohn Barg, Sergio Rodolfo (2009)
      Report de recerca
      Accés obert
      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 (PFEM), combines concepts from particle-based ...