Now showing items 1-20 of 27

    • 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)
      Conference report
      Open Access
      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)
      Lecture
      Open Access
    • A distortion measure to validate and generate curved high-order meshes on CAD surfaces with independence of parameterization 

      Gargallo Peiró, Abel; Roca Navarro, Francisco Javier; Peraire Guitart, Jaume; Sarrate Ramos, Josep (John Wiley & Sons, 2016-06)
      Article
      Open Access
      A framework to validate and generate curved nodal high-order meshes on Computer-Aided Design (CAD) surfaces is presented. The proposed framework is of major interest to generate meshes suitable for thin-shell and 3D finite ...
    • A posteriori finite element error bounds for non-linear outputs of the Helmholtz equation 

      Sarrate Ramos, Josep; Peraire Guitart, Jaume; Patera, A. (1999-09)
      Article
      Open Access
      A Neumann subproblem a posteriori finite element procedure for the efficient and accurate calculation of rigorous, constant-free upper and lower bounds for non-linear outputs of the Helmholtz equation in two-dimensional ...
    • A simple shock-capturing technique for high-order discontinuous Galerkin methods 

      Huerta, Antonio; Casoni Rero, Eva; Peraire Guitart, Jaume (2012-08)
      Article
      Open Access
      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 ...
    • Aircraft Charging and its Influence on Triggered Lightning 

      Pavan, C.; Fontanes Molina, Pol; Urbani, Michele; Nguyen, Ngoc-Cuong; Martínez Sánchez, Manuel; Peraire Guitart, Jaume; Guerra García, Carmen (2020-01-16)
      Article
      Open Access
      This paper reports on a laboratory experiment to study the effect of vehicle net charge on theinception of a positive leader from an aircraft exposed to high atmospheric electric fields. The experimentmodels the first stage ...
    • Análisis no lineal de tanques criogénicos bajo cargas térmicas 

      Oliver Olivella, Xavier; Oñate Ibáñez de Navarra, Eugenio; Peraire Guitart, Jaume; Chueca Castedo, Rosa Mariana (1985-04)
      Article
      Open Access
    • Are high-order and hybridizable discontinuous galerkin methods competitive 

      Huerta, Antonio; Roca Navarro, Francisco Javier; Angeloski, Aleksander; Peraire Guitart, Jaume (2012)
      Conference report
      Restricted access - publisher's policy
      The talk covered several issues motivated by a practical engineering wave propagation problem: real-time evaluation of wave agitation in harbors. The first part, presented the application of a reduced order model in the ...
    • Bounds and adaptivity for 3D limit analysis 

      Muñoz, José J.; Bonet Carbonell, Javier; Huerta, Antonio; Peraire Guitart, Jaume (2009-06-08T10:28:14Z)
      Conference report
      Open Access
      In the present paper we compute upper and lower bounds for limit analysis in two and three dimensions. From the solution of the discretised upper and lower bound problems, and from the optimum displacement rate and stress ...
    • Computing bounds for linear functionals of exact weak solutions to Poisson's equation 

      Sauer-Budge, A. M.; Bonet Carbonell, Javier; Huerta, Antonio; Peraire Guitart, Jaume (2004-01)
      Article
      Open Access
      We present a method for Poisson’s equation that computes guaranteed upper and lower bounds for the values of piecewise-polynomial linear functional outputs of the exact weak solution of the infinite-dimensional continuum ...
    • Computing upper and lower bounds for the J-integral in two-dimensional linear elasticity 

      Xuan, Z C; Parés Mariné, Núria; Peraire Guitart, Jaume (2006-01)
      Article
      Open Access
      We present an a posteriori method for computing rigorous upper and lower bounds for the J-integral in two-dimensional linear elasticity. The J-integral, which is typically expressed as a contour integral, is recast as a ...
    • Defining quality measures for validation and generation of high-order meshes 

      Gargallo Peiró, Abel; Roca Navarro, Francisco Javier; Peraire Guitart, Jaume; Sarrate Ramos, Josep (Springer, 2013)
      Conference report
      Restricted access - publisher's policy
      A procedure to quantify the distortion (quality) of a high-order mesh composed by curved tetrahedral elements is presented. The proposed technique has two main applications. First, it can be used to check the validity and ...
    • Discontinuous Galerkin methods for the Navier–Stokes equations using solenoidal approximations 

      Villardi de Montlaur, Adeline de; Fernández Méndez, Sonia; Peraire Guitart, Jaume; Huerta, Antonio (2010-10-20)
      Article
      Open Access
      An interior penalty method and a compact discontinuous Galerkin method are proposed and compared for the solution of the steady incompressible Navier–Stokes equations. Both compact formulations can be easily applied using ...
    • Distortion and quality measures for validating and generating high-order tetrahedral meshes 

      Gargallo Peiró, Abel; Roca Navarro, Francisco Javier; Peraire Guitart, Jaume; Sarrate Ramos, Josep (2015-07-01)
      Article
      Open Access
      A procedure to quantify the distortion (quality) of a high-order mesh composed of curved tetrahedral elements is presented. The proposed technique has two main applications. First, it can be used to check the validity and ...
    • Efficiency of high-order elements for continuous and discontinuous Galerkin methods 

      Huerta, Antonio; Angeloski, Aleksandar; Roca Navarro, Francisco Javier; Peraire Guitart, Jaume (John Wiley & sons, 2013-11)
      Article
      Open Access
      To evaluate the computational performance of high-order elements, a comparison based on operation count is proposed instead of runtime comparisons. More specifically, linear versus high-order approximations are analyzed ...
    • GPU-accelerated sparse matrix-vector product for a hybridizable discontinuous Galerkin method 

      Roca Navarro, Francisco Javier; Nguyeny, N.C.; Peraire Guitart, Jaume (2011)
      Conference report
      Restricted access - publisher's policy
      The iterative solution of the large systems of equations that result from discontinuous Galerkin (DG) discretizations require the ability to carry out fast matrix-vector products. DG matrices have a sparse block structure ...
    • High-order mesh generation on CAD geometries 

      Gargallo Peiró, Abel; Roca Navarro, Francisco Javier; Peraire Guitart, Jaume; Sarrate Ramos, Josep (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2013)
      Conference report
      Restricted access - publisher's policy
      We present a technique to extend Jacobian-based distortion (quality) measures for planar triangles to high-order isoparametric elements of any interpolation degree on CAD parameterized surfaces. The resulting distortion ...
    • Inserting curved boundary layers for viscous flow simulation with high-order tetrahedra 

      Gargallo Peiró, Abel; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep; Peraire Guitart, Jaume (Springer, 2013)
      Conference lecture
      Restricted access - publisher's policy
      We propose an a posteriori approach for generating curved meshes for viscous flow simulations composed by high-order tetrahedra. The proposed approach is performed in the following three steps: (1) generate a linear ...
    • One-dimensional shock-capturing for high-order discontinuous Galerkin methods 

      Casoni Rero, Eva; Peraire Guitart, Jaume; Huerta, Antonio (2012-02)
      Article
      Open Access
      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)
      Conference lecture
      Open Access
      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 ...