Exploració per autor "Codina, Ramon"
Ara es mostren els items 54-73 de 101
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Lecture Notes on the Mechanics of Beams
Codina, Ramon (Universitat Politècnica de Catalunya, 2022)
Apunts
Accés obert -
Logarithmic conformation reformulation in viscoelastic flow problems approximated by a VMS-type stabilized finite element formulation
Moreno Martínez, Laura; Codina, Ramon; Baiges Aznar, Joan; Castillo, Ernesto (2019-09)
Article
Accés obertThe log-conformation reformulation, originally proposed by Fattal and Kupferman (2004), allows computing incompressible viscoelastic problems with high Weissenberg numbers which are impossible to solve with the typical ... -
Long term stability estimates and existence of a global attractor in a finite element approximation of the Navier-Stokes equations with numerical sub-grid scale modeling
Badia, Santiago; Codina, Ramon; Gutiérrez Santacreu, Juan Vicente (2012)
Text en actes de congrés
Accés obertVariational multiscale methods lead to stable finite element approximations of the Navier-Stokes equations, both dealing with the indefinite nature of the system (pressure stability) and the velocity stability loss for ... -
Long-term stability estimates and existence of a global attractor in a finite element approximation of the Navier-Stokes equations with numerical sub-grid scale modeling
Badia, Santiago; Codina, Ramon; Gutiérrez Santacreu, Juan Vicente (2009-08-01)
Article
Accés obertVariational multiscale methods lead to stable finite element approximations of the Navier-Stokes equations, both dealing with the indefinite nature of the system pressure stability) and the velocity stability loss for high ... -
Mixed stabilized finite element methods in linear elasticity for the velocity–stress equations in the time and the frequency domains
Fabra Ruiz, Arnau; Codina, Ramon (2023-02)
Article
Accés restringit per política de l'editorialIn this work we present stabilized finite element methods for the mixed velocity–stress elasticity equations and for its irreducible velocity form. This is done both for the time and frequency domains, the latter being ... -
Mixed Stabilized Finite Element Methods in Nonlinear Solid Mechanics. Part I: Formulation
Cervera Ruiz, Miguel; Chiumenti, Michele; Codina, Ramon (2009-07-22)
Article
Accés obertThis paper exploits the concept of stabilized finite element methods to formulate stable mixed stress/displacement and strain/displacement finite elements for the solution of nonlinear solid mechanics problems. The different ... -
Mixed Stabilized Finite Element Methods in Nonlinear Solid Mechanics. Part II: Strain Localization
Cervera Ruiz, Miguel; Chiumenti, Michele; Codina, Ramon (2009-07-22)
Article
Accés obertThis paper deals with the question of strain localization associated with materials which exhibit softening due to tensile straining. A standard local isotropic Rankine damage model with strain-softening is used as exemplary ... -
Mixed stabilized finite element methods in nonlinear solid mechanics. Part III: compressible and incompressible plasticity
Cervera Ruiz, Miguel; Chiumenti, Michele; Benedetti, Lorenzo; Codina, Ramon (2015-03)
Article
Accés obertThis paper presents the application of a stabilized mixed strain/displacement finite element formulation for the solution of nonlinear solid mechanics problems involving compressible and incompressible plasticity. The ... -
Modal analysis of elastic vibrations of incompressible materials using a pressure-stabilized finite element method
Codina, Ramon; Türk, Önder (2022-09)
Article
Accés obertThis paper describes a modal analysis technique to approximate the vibrations of incompressible elastic solids using a stabilized finite element method to approximate the associated eigenvalue problem. It is explained why ... -
Model problems in magneto-hydrodynamics: individual numerical challenges and coupling possibilities
Codina, Ramon; Badia, Santiago; Planas Badenas, Ramon (2011)
Text en actes de congrés
Accés obertIn this work we discuss two model problems appearing in magneto-hydrodynamics (MHD), namely, the so called full MHD problem and the inductionless MHD problem. The first involves as unknowns the fluid velocity and pressure, ... -
Model problems in magneto-hydrodynamics: individual numerical challenges and coupling possibilities
Codina, Ramon; Badia, Santiago; Planas Badenas, Ramon (CIMNE, 2011)
Text en actes de congrés
Accés obertIn this work we discuss two model problems appearing in magneto-hydrodynamics (MHD), namely, the so called full MHD problem and the inductionless MHD problem. The first involves as unknowns the fluid velocity and pressure, ... -
Numerical analysis of a stabilized finite element approximation for the three-field linearized viscoelastic fluid problem using arbitrary interpolations
Castillo del Barrio, Ernesto; Codina, Ramon (2017-07)
Article
Accés obertIn this paper we present the numerical analysis of a three-field stabilized finite element formulation recently proposed to approximate viscoelastic flows. The three-field viscoelastic fluid flow problem may suffer from ... -
Numerical simulation of Fluid–Structure Interaction problems with viscoelastic fluids using a log-conformation reformulation
Moreno Martínez, Laura; Castañar Pérez, Inocencio; Codina, Ramon; Baiges Aznar, Joan; Cattoni, Domingo (2023-05)
Article
Accés obertIn this paper the numerical simulation of the interaction between Oldroyd-B viscoelastic fluid flows and hyperelastic solids is approached. The algorithm employed is a classical block-iterative scheme, in which the solid ... -
Numerical simulation of non-isothermal viscoelastic fluid flows using a VMS stabilized finite element formulation
Moreno Martínez, Laura; Codina, Ramon; Baiges Aznar, Joan (2021-10)
Article
Accés obertThe effect of temperature in viscoelastic fluid flows is studied applying a stabilized finite element formulation based on both a standard and a log-conformation reformulation (LCR), and the Variational Multiscale (VMS) ... -
On an unconditionally convergent stabilized finite element approximation of resistive magnetohydrodynamics
Badia, Santiago; Codina, Ramon; Planas Badenas, Ramon (2010-11-16)
Report de recerca
Accés obertIn this work, we propose a new stabilized finite element formulation for the approximation of the resistive magnetohydrodynamics equations. The novelty of this formulation with respect to existing ones is the fact that ... -
On an unconditionally convergent stabilized finite element approximation of resistive magnetohydrodynamics
Badia, Santiago; Codina, Ramon; Planas Badenas, Ramon (2013-02)
Article
Accés obertIn this work, we propose a new stabilized finite element formulation for the approximation of the resistive magnetohydrodynamics equations. The novelty of this formulation is the fact that it always converges to the physical ... -
On some time marching schemes for the stabilized finite element approximation of the mixed wave equation
Espinoza Román, Héctor Gabriel; Codina, Ramon; Badia, Santiago (2015-11)
Article
Accés obertIn this paper we analyze time marching schemes for the wave equation in mixed form. The problem is discretized in space using stabilized finite elements. On the one hand, stability and convergence analyses of the fully ... -
On the approximation of the subgrid scale for systems of equations
Principe, Ricardo Javier; Codina, Ramon (2008)
Ressenya
Accés obert -
On the design of discontinuous Galerkin methods for elliptic problems based on hybrid formulations
Codina, Ramon; Badia, Santiago (2012)
Report de recerca
Accés obertThe objective of this paper is to present a framework for the design of discontinuous Galerkin (dG) methods for elliptic problems. The idea is to start from a hybrid formulation of the problem involving as unknowns the ... -
On the stabilization parameter in the subgrid scale approximation of scalar convection-diffusion-reaction equations on distorted meshes
Principe, Ricardo Javier; Codina, Ramon (2010-04-01)
Article
Accés restringit per política de l'editorialIn this paper we revisit the definition of the stabilization parameter in the finite element approximation of the convection–diffusion–reaction equation. The starting point is the decomposition of the unknown into its ...