Ara es mostren els items 1-20 de 172

  • 3D nurbs-enhanced finite element method 

    Sevilla Cárdenas, Rubén; Fernandez Mendez, Sonia; Huerta, Antonio (2009-06-08T10:12:04Z)
    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 is able to exactly represent the geometry by means of the usual CAD description of the boundary ...
  • 3D NURBS-enhanced finite element method (NEFEM) 

    Sevilla Cárdenas, Rubén; Fernandez Mendez, Sonia; Huerta, Antonio (Wiley and Sons, 2011-10-14)
    Article
    Accés restringit per política de l'editorial
    This paper presents the extension of the recently proposed NURBS-enhanced finite element method (NEFEM) to 3D domains. NEFEM is able to exactly represent the geometry of the computational domain by means of its CAD boundary ...
  • A comparison of two formulations to blend finite elements and mesh-free methods 

    Huerta, Antonio; Fernandez Mendez, Sonia; Liu, W K (2004-03)
    Article
    Accés obert
    Mesh-free methods have since their early developments been blended to the finite element formulation in order to benefit from the advantages of both numerical techniques. In this paper, two recently proposed formulations ...
  • A critical comparison of two discontinuous galerkin methods for the navier-stokes equations using solenoidal aproximations 

    Villardi de Montlaur, Adeline de; Peraire Guitart, Jaume; Huerta, Antonio (2009-06-08T07:49:26Z)
    Text en actes de congrés
    Accés obert
    This paper compares two methods to solve incompressible problems, in particular the Navier-Stokes equations, using a discontinuous polynomial interpolation that is exactly divergence-free in each element. The first method ...
  • A discontinuous galerkin formulation for solid dynamics 

    Peraire Guitart, Jaume; Bonet Carbonell, Javier; Huerta, Antonio; Persson, Per Olof; Vidal Seguí, Yolanda (Omnipress, 2006)
    Presentació
    Accés obert
  • A flux-free a posteriori error estimator for the incompressible Stokes problem using a mixed FE formulation 

    Larsson, Fredrik; Díez, Pedro; Huerta, Antonio (2010-08-01)
    Article
    Accés obert
    In this contribution, we present an a posteriori error estimator for the incompressible Stokes problem valid for a conventional mixed FE formulation. Due to the saddle-point property of the problem, conventional error ...
  • A fractional-step method for the incompressible Navier-Stokes equations related to a predictor-multicorrector algorithm 

    Blasco Lorente, Jorge; Codina, Ramon; Huerta, Antonio (1998-12)
    Article
    Accés obert
    An implicit fractional-step method for the numerical solution of the time-dependent incompressible Navier-Stokes equations in primitive variables is studied in this paper. The method, which is first-order-accurate in the ...
  • A new damage model based on non-local displacements 

    Rodríguez Ferran, Antonio; Morata, I; Huerta, Antonio (2005-04)
    Article
    Accés obert
    A new non-local damage model is presented. Non-locality (of integral or gradient type) is incorporated into the model by means of non-local displacements. This contrasts with existing damage models, where a non-local strain ...
  • A new least-squares approximation of affine mappings for sweep algorithms 

    Roca Navarro, Francisco Javier; Sarrate Ramos, Josep; Huerta, Antonio (2010-06)
    Article
    Accés obert
    This paper presents a new algorithm to generate hexahedral meshes in extrusion geometries. Several algorithms have been devised to generate hexahedral meshes by projecting the cap surfaces along a sweep path. In all of ...
  • A note on a numerical benchmark test: an axisymmetric shell under ring loads 

    Vila Rius, Agnès; Rodríguez Ferran, Antonio; Huerta, Antonio (1997-03)
    Article
    Accés obert
    In this paper, a well-known numerical benchmark test which is usually solved with displacement control for low values of the load eccentricity is examined for a complete range of eccentricities of the ring load. For a ...
  • A note on upper bound formulations in limit analysis 

    Muñoz Romero, José; Huerta, Antonio; Bonet Carbonell, Javier; Peraire, Jaume (John Wiley & Sons, 2012-08-24)
    Article
    Accés restringit per política de l'editorial
    In this paper we study some recent formulations for the computation of upper bounds in limit analysis. We show that a previous formulation presented by the authors does not guarantee the strictness of the upper bound, ...
  • A posteriori error estimation for standard finite element analysis 

    Díez, Pedro; Egozcue Rubí, Juan José; Huerta, Antonio (1998-09)
    Article
    Accés obert
    A new residual type estimator based on projections of the error on subspaces of locally-supported functions is presented. The estimator is defined by a standard element-by-element refinement. First, an approximation of the ...
  • A simple shock-capturing technique for high-order discontinuous Galerkin methods 

    Huerta, Antonio; Casoni Rero, Eva; Peraire Guitart, Jaume (2012-08)
    Article
    Accés obert
    This article presents a novel shock-capturing technique for the discontinuous Galerkin (DG) method. The technique is designed for compressible flow problems, which are usually characterized by the presence of strong shocks ...
  • A unified approach to remeshing strategies for finite element h-adaptativity 

    Díez, Pedro; Huerta, Antonio (1999-07)
    Article
    Accés obert
    In h-adaptivity, a remeshing strategy is needed to compute the distribution of required element size using the estimated error distribution. Several authors have introduced different remeshing strategies yielding very ...
  • Accuracy of two stress update algorithms for shear-free large deformations paths 

    Rodríguez Ferran, Antonio; Huerta, Antonio (1999-06)
    Article
    Accés obert
    The behavior of two stress update algorithms for shear-free large deformation paths is analyzed. The first algorithm has a truncation error of order 1. The second algorithm has a truncation error of order 2. As a consequence, ...
  • Accurate upper and lower error bounds by solving flux-free local problems in 

    Díez, Pedro; Parés Mariné, Núria; Huerta, Antonio (2004-12)
    Article
    Accés obert
    Two implicit residual type estimators yielding upper bounds of the error are presented which do not require flux equilibration. One of them is based on the ideas introduced in [MAC 00, CAR 99, MOR 03, PRU 02]. The new ...
  • Adaptació de l’ensenyament semipresencial dels mètodes numèrics dins del marc del sistema ects 

    Sarrate Ramos, Josep; Rodríguez Ferran, Antonio; Fernandez Mendez, Sonia; Sevilla Cárdenas, Rubén; Rozados, Oriol; Díez, Pedro; Huerta, Antonio (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2008-02-07)
    Text en actes de congrés
    Accés obert
    En l’actualitat els mètodes numèrics s’han consolidat com una disciplina horitzontal en l’àmbit de l’enginyeria civil. En aquest sentit, les assignatures bàsiques relacionades directament amb els mètodes numèrics han ...
  • Adapting Broyden method to handle linear constraints imposed via Lagrange multipliers 

    Rodríguez Ferran, Antonio; Huerta, Antonio (Wiley and Sons, 1999-09)
    Article
    Accés obert
    Various non-linear equation solvers are adapted to handle linear constraints via the Lagrange-multiplier technique. This adaptation process turns out to be quite straightforward for Newton-Raphson methods and rank-two ...
  • Adaptive analysis based on error estimation for nonlocal damage models 

    Rodríguez Ferran, Antonio; Arbós, I; Huerta, Antonio (2001-05)
    Article
    Accés obert
    An adaptive finite element strategy for nonlocal damage computations is presented. The proposed approach is based on the combination of a residual-type error estimator and quadrilateral h-remeshing. A distinctive feature ...
  • Adaptive analysis of yield line patterns in plates with the Arbitrary Lagrangian-Eulerian method 

    Askes, Harm; Rodríguez Ferran, Antonio; Huerta, Antonio (1999-02)
    Article
    Accés obert
    Plasticity models provide suitable tools to describe the so-called yield line pattern that occurs with the failure of plates. However, in a Lagrangian description a huge number of finite elements are needed for accurate ...