Ara es mostren els items 1-20 de 189

  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Adaptive finite element strategies based on error assessment 

    Huerta, Antonio; Rodríguez Ferran, Antonio; Díez, Pedro; Sarrate Ramos, Josep (Wiley and Sons, 1999-09)
    Article
    Accés obert
    Two main ingredients are needed for adaptive finite element computations. First, the error of a given solution must be assessed, by means of either error estimators or error indicators. After that, a new spatial discretization ...
  • Adaptivity based on error estimation for viscoplastic softening materials 

    Díez, Pedro; Arroyo Balaguer, Marino; Huerta, Antonio (2000-02)
    Article
    Accés obert
    This paper focuses on the numerical simulation of strain softening mechanical problems. Two problems arise: (1) the constitutive model has to be regular and (2) the numerical technique must be able to capture the two scales ...
  • 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
  • Advanced harmonic techniques for solving the transient heat equation 

    Aguado, José Vicente; Huerta, Antonio; Chinesta, Francisco; Cueto Prendes, Elias; Leygue, Adrien (Sociedad Española de Métodos Numéricos en Ingeniería (SEMNI), 2013)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Simulation-based management of processes has always been a big challenge because of the difficulty to merge two apparently opposed idea s: the real time handling demanded by the process, and the traditionally strong ...
  • A face-centred finite volume method for second-order elliptic problems 

    Sevilla, Rubén; Giacomini, Matteo; Huerta, Antonio (John Wiley & sons, 2018-08-24)
    Article
    Accés restringit per política de l'editorial
    This work proposes a novel finite volume paradigm, the face-centred finite volume (FCFV) method. Contrary to the popular vertex (VCFV) and cell (CCFV) centred finite volume methods, the novel FCFV defines the solution on ...
  • 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 ...
  • ALE stress update for transient and quasistatic processes 

    Rodríguez Ferran, Antonio; Casadei, F.; Huerta, Antonio (Wiley and Sons, 1998-09)
    Article
    Accés obert
    A key issue in Arbitrary Lagrangian-Eulerian (ALE) non-linear solid mechanics is the correct treatment of the convection terms in the constitutive equation. These convection terms, which reflect the relative motion between ...
  • Algebraic PGD for tensor separation and compression: an algorithmic approach 

    Díez, Pedro; Zlotnik, Sergio; García González, Alberto; Huerta, Antonio (2018-07)
    Article
    Accés obert
    Proper Generalized Decomposition (PGD) is devised as a computational method to solve high-dimensional boundary value problems (where many dimensions are associated with the space of parameters defining the problem). The ...
  • A locking-free face-centred finite volume (FCFV) method for linear elastostatics 

    Sevilla, Rubén; Giacomini, Matteo; Huerta, Antonio (2019-02-01)
    Article
    Accés restringit per política de l'editorial
    A face-centred finite volume (FCFV) method is proposed for linear elastostatic problems. The FCFV is a mixed hybrid formulation, featuring a system of first-order equations, that defines the unknowns on the faces (edges ...