Ara es mostren els items 153-172 de 220

    • NEFEM for EULER equations 

      Sevilla Cárdenas, Rubén; Fernández Méndez, Sonia; Huerta, Antonio (2009-02-16T11:29:15Z)
      Text en actes de congrés
      Accés obert
      An improvement of the classical finite element method is proposed in [1], the NURBS-Enhanced Finite Element Method (NEFEM). It considers an exact representation of the geometry by means of the usual CAD description of the ...
    • New ALE applications in non-linear fast-transient solid dynamics 

      Huerta, Antonio; Casadei, F. (1994-08)
      Article
      Accés obert
      The arbitrary Lagrangian—Eulerian (ALE) formulation, which is already well established in the hydrodynamics and fluid-structure interaction fields, is extended to materials with memory, namely, non- linear path-dependent ...
    • Nonintrusive proper generalised decomposition for parametrised incompressible flow problems in OpenFOAM 

      Tsiolakis, Vasileios; Giacomini, Matteo; Sevilla Cárdenas, Rubén; Othmer, Carsten; Huerta, Antonio (2020-04)
      Article
      Accés obert
      The computational cost of parametric studies currently represents the major limitation to the application of simulation-based engineering techniques in a daily industrial environment. This work presents the first nonintrusive ...
    • Numerical analysis of nonlinear large-strain consolidation and filling 

      Huerta, Antonio; Rodríguez Ferran, Antonio (1992-07)
      Article
      Accés obert
      Finite strain consolidation and filling of soft sediments at high water level is a challenging problem because of its highly non-linear physical and mathematical aspects. Several numerical schemes designed for this problem ...
    • Numerical differentiation for local and global tangent operators in computational plasticity 

      Pérez Foguet, Agustí; Rodríguez Ferran, Antonio; Huerta, Antonio (1998-09)
      Report de recerca
      Accés obert
      In this paper, numerical differentiation is applied to integrate plastic constitutive laws and to compute the corresponding consistent tangent operators. The deriva- tivesoftheconstitutive equationsareapproximatedbymea ...
    • Numerical differentiation for local and global tangent operators in computational plasticity 

      Pérez Foguet, Agustí; Rodríguez Ferran, Antonio; Huerta, Antonio (2000)
      Article
      Accés obert
      In this paper, numerical di¿erentiation is applied to integrate plastic constitutive laws and to compute the corresponding consistent tangent operators. The derivatives of the constitutive equations are approximated by ...
    • Numerical differentiation for local and global tangent operators in computational plasticity. 

      Pérez Foguet, Agustí; Rodríguez Ferran, Antonio; Huerta, Antonio (2000-08)
      Article
      Accés obert
      In this paper, numerical differentiation is applied to integrate plastic constitutive laws and to compute the corresponding consistent tangent operators. The derivatives of the constitutive equations are approximated by ...
    • Numerical differentiation for non-trivial consistent tangent matrices: an application to the MRS-lade model 

      Pérez Foguet, Agustí; Rodríguez Ferran, Antonio; Huerta, Antonio (Wiley and Sons, 2000-05)
      Article
      Accés obert
      In a companion paper Pérez-Foguet, A., Rodríguez-Ferran, A. and Huerta, A. Numerical differentiation for local and global tangent operators in computational plasticity. Computer Methods in Applied Mechanics and Engineering, ...
    • Numerical modelling of void inclusions in porous media 

      Rodríguez Ferran, Antonio; Sarrate Ramos, Josep; Huerta, Antonio (Wiley and Sons, 2004-01)
      Article
      Accés obert
      Numerical modelling of porous flow in a low-permeability matrix with high-permeability inclusions is a challenging task because the large ratio of permeabilities ill-conditions the finite element system of equations. We ...
    • Numerical representation of the quality measures of triangles and triangular meshes 

      Sarrate Ramos, Josep; Palau, J; Huerta, Antonio (2003-07)
      Article
      Accés obert
      In this note a new procedure to represent the quality measure for triangles is proposed. The triangles are identified by their three angles and are represented in a bounded domain, called angle representation region, ...
    • NURBS-enhanced finite element method (NEFEM) 

      Sevilla Cárdenas, Rubén; Fernández Méndez, Sonia; Huerta, Antonio (Wiley and Sons, 2008-10)
      Article
      Accés obert
      An improvement to the classical finite element (FE) method is proposed. It is able to exactly represent the geometry by means of the usual CAD description of the boundary with non-uniform rational B-splines (NURBS). Here, ...
    • NURBS-Enhanced Finite Element Method (NEFEM) 

      Sevilla Cárdenas, Rubén; Fernández Méndez, Sonia; Huerta, Antonio (2011-11)
      Article
      Accés obert
      The development of NURBS-Enhanced Finite Element Method (NEFEM) is revisited. This technique allows a seamless integration of the CAD boundary representation of the domain and the finite element method (FEM). The importance ...
    • NURBS-enhanced finite element method for Euler equations 

      Sevilla Cárdenas, Rubén; Fernández Méndez, Sonia; Huerta, Antonio (2008-07)
      Article
      Accés obert
      In this work, the NURBS-enhanced finite element method (NEFEM) is combined with a discontinuous Galerkin (DG) formulation for the numerical solution of Euler equations of gas dynamics. With NEFEM, numerical fluxes along ...
    • On the natural stabilization of convection dominated problems using high order Bubnov–Galerkin finite elements 

      Cai, Quanji; Kollmannsberger, Stefan; Sala Lardies, Esther; Huerta, Antonio; Rank, Ernst (2014-01)
      Article
      Accés restringit per política de l'editorial
      In the case of dominating convection, standard Bubnov–Galerkin finite elements are known to deliver oscillating discrete solutions for the convection–diffusion equation. This paper demonstrates that increasing the polynomial ...
    • One-dimensional shock-capturing for high-order discontinuous Galerkin methods 

      Casoni Rero, Eva; Peraire Guitart, Jaume; Huerta, Antonio (2012-02)
      Article
      Accés obert
      Discontinuous Galerkin methods have emerged in recent years as an alternative for nonlinear conservation equations. In particular, their inherent structure (a numerical flux based on a suitable approximate Riemann solver ...
    • Optimal collapse simulator for three-dimensional frames 

      Sarrate Ramos, Josep; Huerta, Antonio; Bonet Carbonell, Javier; Peraire Guitart, Jaume; Saà Seoane, Joel; Vidal Codina, Ferran (Universitat Politècnica de Catalunya. Escola Superior d'Enginyers de Camins Canals i Ports de Barcelona, 2011-11-15)
      Comunicació de congrés
      Accés obert
      In this work a limit analysis for 3D structures software package is presented. The goal is to obtain for a certain structure the load factor λ that applied to the external loads induces collapse to the structure. The ...
    • Optimally convergent high-order X-FEM for problems with voids and inclusions 

      Sala Lardies, Esther; Fernández Méndez, Sonia; Huerta, Antonio (2012)
      Text en actes de congrés
      Accés obert
      Solution of multiphase problems shows discontinuities across the material interfaces, which are usually weak. Using the eXtended Finite Element Method (X-FEM), these problems can be solved even for meshes that do not ...
    • Parametric solutions involving geometry: a step towards efficient shape optimization 

      Ammar, Amine; Huerta, Antonio; Chinesta, Francisco; Cueto Prendes, Elias; Leygue, Adrien (2014-01)
      Article
      Accés obert
      Optimization of manufacturing processes or structures involves the optimal choice of many parameters (process parameters, material parameters or geometrical parameters). Usual strategies proceed by defining a trial choice ...
    • Parametric solutions of turbulent incompressible flows in OpenFOAM via the proper generalised decomposition 

      Tsiolakis, Vasileios; Giacomini, Matteo; Sevilla Cárdenas, Rubén; Othmer, Carsten; Huerta, Antonio (Elsevier, 2022-01-15)
      Article
      Accés obert
      An a priori reduced order method based on the proper generalised decomposition (PGD) is proposed to compute parametric solutions involving turbulent incompressible flows of interest in an industrial context, using OpenFOAM. ...
    • Permeability and compressibility of slurries from seepage-induced consolidation 

      Huerta, Antonio; Kriegsmann, Gregory; Krizek, Raymond J. (1988-05)
      Article
      Accés obert
      A one-dimensional mathematical model based on finite-strain theory is developed to solve the problem of seepage-induced consolidation in sedimented slurries or very soft clays. The direct solution employs known or assumed ...