• Physics-based balancing domain decomposition by constraints for multi-material problems 

  Badia, Santiago; Martín Huertas, Alberto Francisco; Nguyen, Hieu Trung (2018-11)
  Article
  Accés restringit per política de l'editorial

  In this work, we present a new variant of the balancing domain decomposition by constraints preconditioner that is robust for multi-material problems. We start with a well-balanced subdomain partition, and based on an ...
• Large-scale stochastic topology optimization using adaptive mesh refinement and coarsening through a two-level parallelization scheme 

  Baiges Aznar, Joan; Martínez Frutos, Jesús; Herrero Pérez, David; Otero, Fermín; Ferrer, Alex (2019-01)
  Article
  Accés restringit per política de l'editorial

  Abstract Topology optimization under uncertainty of large-scale continuum structures is a computational challenge due to the combination of large finite element models and uncertainty propagation methods. The former ...
• Balancing domain decomposition by constraints associated with subobjects 

  Badia, Santiago; Martín Huertas, Alberto Francisco; Nguyen, Hieu Trung (Elsevier, 2019-01)
  Article
  Accés restringit per política de l'editorial

  A simple variant of the BDDC preconditioner in which constraints are imposed on a selected set of subobjects (subdomain subedges, subfaces and vertices between pairs of subedges) is presented. We are able to show that the ...
• Variational multiscale error estimators for the adaptive mesh refinement of compressible flow simulations 

  Bayona Roa, Camilo Andrés; Codina, Ramon; Baiges Aznar, Joan (2018-08)
  Article
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  This article investigates an explicit a-posteriori error estimator for the finite element approximation of the compressible Navier–Stokes equations. The proposed methodology employs the Variational Multi-Scale framework, ...
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  Approximation of the shallow water equations with higher order finite elements and variational multiscale methods 

  Villota Cadena, Ángel Patricio; Codina, Ramon (2018-01)
  Article
  Accés obert

  In this article, we present approximations with finite elements of high order using stabilized variational multiscale methods to approximate the equations of motion of a fluid in shallow waters. We write these equations ...
• Multi-objective design optimisation of stamping process for advanced high strength steels 

  Lee, Dong Seop; Pons Prats, Jordi; Espinoza Román, Héctor Gabriel; Fruitós Bickham, Óscar Alejandro; Oñate Ibáñez de Navarra, Eugenio (2012)
  Text en actes de congrés
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  The paper investigates the multi-objective design optimisation of stamping process to control both the shape and quality of final Advanced High Strength Steels (AHSSs) in terms of springback and safety using Distributed ...
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  Driving mechanisms and streamwise homogeneity in molecular dynamics simulations of nanochannel flows 

  Bitrian Varea, Vicente; Principe, Ricardo Javier (2018-01-12)
  Article
  Accés obert

  In molecular dynamics simulations, nanochannel flows are usually driven by a constant force, that aims to represent a pressure difference between inlet and outlet, and periodic boundary conditions are applied in the ...
• The aggregated unfitted finite element method for elliptic problems 

  Badia, Santiago; Verdugo Rojano, Francesc; Martín Huertas, Alberto Francisco (2018-07)
  Article
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  Unfitted finite element techniques are valuable tools in different applications where the generation of body-fitted meshes is difficult. However, these techniques are prone to severe ill conditioning problems that obstruct ...
• Solution of low Mach number aeroacoustic flows using a Variational Multi-Scale finite element formulation of the compressible Navier–Stokes equations written in primitive variables 

  Bayona Roa, Camilo Andrés; Baiges Aznar, Joan; Codina, Ramon (2018-02)
  Article
  Accés restringit per política de l'editorial

  In this work we solve the compressible Navier–Stokes equations written in primitive variables in order to simulate low Mach number aeroacoustic flows. We develop a Variational Multi-Scale formulation to stabilize the finite ...
• Robust and scalable domain decomposition solvers for unfitted finite element methods 

  Badia, Santiago; Verdugo Rojano, Francesc (2018-12)
  Article
  Accés restringit per política de l'editorial

  Unfitted finite element methods, e.g., extended finite element techniques or the so-called finite cell method, have a great potential for large scale simulations, since they avoid the generation of body-fitted meshes and ...
• Nonlinear parallel-in-time Schur complement solvers for ordinary differential equations 

  Badia, Santiago; Olm Serra, Marc (2018-12)
  Article
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  In this work, we propose a parallel-in-time solver for linear and nonlinear ordinary differential equations. The approach is based on an efficient multilevel solver of the Schur complement related to a multilevel time ...
• Stabilized mixed finite element method for the M1 radiation model 

  Schmid, Quentin; Mesri, Youssef; Hachem, Elie; Codina, Ramon (2018-06)
  Article
  Accés restringit per política de l'editorial

  In this work, we present a computational approach for the numerical simulation of thermal radiation. Radiation is modeled by solving a set of two coupled partial differential equations, the so-called M1 model. A Variational ...

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