Exploració per autor "Codina, Ramon"
Ara es mostren els items 68-87 de 101
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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 ... -
Projection-based reduced order models for flow problems: a variational multiscale approach
Reyes, Ricardo; Codina, Ramon (2020-05)
Article
Accés obertIn this paper we present a Variational Multi-Scale stabilized formulation for a general projection-based Reduced Order Model. In the stabilized formulation we address techniques already analysed in Variational Multi-Scale-Finite ... -
Pseudoplastic fluid flows for different Prandtl numbers: steady and time-dependent solutions
Aguirre, A.; Castillo, Ernesto; Cruchaga, Marcela A.; Codina, Ramon; Baiges Aznar, Joan (2019-11)
Article
Accés obertIn this work, a variational multiscale (VMS) finite element formulation is used to approximate numerically the natural convection in square cavity with differentially heated from sidewalls problem for Newtonian and power-law ... -
Reduced order models for thermally coupled low Mach flows
Reyes, Ricardo; Codina, Ramon; Baiges Aznar, Joan; Idelsohn Barg, Sergio Rodolfo (Springer, 2018-12)
Article
Accés obertIn this paper we present a collection of techniques used to formulate a projection-based reduced order model (ROM) for zero Mach limit thermally coupled Navier–Stokes equations. The formulation derives from a standard ... -
Reduced-order subscales for POD models
Baiges Aznar, Joan; Codina, Ramon; Idelsohn Barg, Sergio Rodolfo (2015-07-01)
Article
Accés obertIn this work the Reduced-Order Subscales for Proper Orthogonal Decomposition models are presented. The basic idea consists in splitting the full-order solution into the part which can be captured by the reduced-order model ... -
Residual-based stabilization of the finite element approximation to the acoustic perturbation equations for low Mach number aeroacoustics
Guasch Fortuny, Oriol; Sánchez Martín, Patricia; Pont Ribas, Arnau; Baiges Aznar, Joan; Codina, Ramon (2016-12)
Article
Accés obertThe acoustic perturbation equations (APE) are suitable to predict aerodynamic noise in the presence of a non-uniform mean flow. As for any hybrid computational aeroacoustics approach, a first computational fluid dynamics ... -
Resolución numérica de las ecuaciones de la magnetohidrodinámica en el proceso Czochralski para la obtención de cristales semiconductores
Hernández Silva, Noel; Codina, Ramon (Universitat Politècnica de Catalunya. CIMNE, 2010)
Article
Accés obertEl objetivo de este trabajo es introducir y resolver numéricamente el modelo matemático para el comportamiento del líquido semiconductor en el proceso Czochralski de obtención de cristales semicondutores bajo la acción de ... -
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 (2019-02)
Article
Accés obertIn 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 ... -
Solution of transient viscoelastic flow problems approximated by a term-by-term VMS stabilized finite element formulation using time-dependent subgrid-scales
Moreno Martínez, Laura; Codina, Ramon; Baiges Aznar, Joan (2020-08)
Article
Accés obertSome finite element stabilized formulations for transient viscoelastic flow problems are presented in this paper. These are based on the Variational Multiscale (VMS) method, following the approach introduced in Castillo ... -
Space and time error estimates for a first order, pressure stabilized finite element method for the incompressible Navier-Stokes equations
Blasco Lorente, Jorge; Codina, Ramon (1999)
Article
Accés obertIn this paper we analyse a pressure stabilized, finite element method for the unsteady, incompressible Navier-Stokes equations in primitive variables; for the time discretization we focus on a fully implicit, monolithic ... -
Spatial approximation of the radiation transport equation using a two-scale finite element method
Ávila, Matías; Codina, Ramon; Principe, Ricardo Javier (2009-08-11)
Article
Accés obertIn this paper we present stabilized finite element methods to discretize in space the monochromatic radiation transport equation. These methods are based on the decomposition of the unknowns into resolvable and subgrid ... -
Stabilised variational multi-scale finite element formulations for viscoelastic fluids
Castillo, Ernesto; Moreno Martínez, Laura; Baiges Aznar, Joan; Codina, Ramon (2021-05)
Article
Accés obertThe objective of this article is to summarise the work that we have been doing as a group in the context of stabilised finite element formulations for viscoelastic fluid flows. Viscoelastic fluids are complex non-Newtonian ... -
Stabilized continuous and discontinuous Galerkin techniques for Darcy flow.
Badia, Santiago; Codina, Ramon (2008-12-09)
Article
Accés obertWe design stabilized methods based on the variational multiscale decomposition of Darcy's problem. A model for the subscales is designed by using a heuristic Fourier analysis. This model involves a characteristic length ... -
Stabilized finite element formulation for the mixed convected wave equation in domains with driven flexible boundaries
Guasch Fortuny, Oriol; Arnela, Marc; Codina, Ramon; Espinoza Román, Héctor Gabriel (2015)
Text en actes de congrés
Accés restringit per política de l'editorialA stabilized finite element (FEM) formulation for the wave equation in mixed form with convection is presented, which permits using the same interpolation fields for the acoustic pressure and the acoustic particle velocity. ... -
Stabilized mixed finite element method for the M1 radiation model
Schmid, Quentin; Mesri, Youssef; Hachem, Elie; Codina, Ramon (2018-06)
Article
Accés obertIn 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 ...