Exploració per autor "Codina, Ramon"
Ara es mostren els items 34-53 de 101
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Computational aeroacoustics to identify sound sources in the generation of sibilant /s/
Pont Ribas, Arnau; Guasch Fortuny, Oriol; Baiges Aznar, Joan; Codina, Ramon; van Hirtum, Annemie (John Wiley & sons, 2019-01)
Article
Accés obertA sibilant fricative /s/ is generated when the turbulent jet in the narrow channel between the tongue blade and the hard palate is deflected downwards through the space between the upper and lower incisors and then impinges ... -
Concurrent finite element simulation of quadrupolar and dipolar flow noise in low Mach number aeroacoustics
Guasch Fortuny, Oriol; Pont Ribas, Arnau; Baiges Aznar, Joan; Codina, Ramon (Elsevier, 2016-07)
Article
Accés obertThe computation of flow-induced noise at low Mach numbers usually relies on a two-step hybrid methodolgy. In the first step, an incompressible fluid dynamics simulation (CFD) is performed and an acoustic source term is ... -
Development of an algebraic fractional step scheme for the primitive formulation of the compressible Navier-Stokes equations
Parada Bustelo, Samuel; Codina, Ramon; Baiges Aznar, Joan (2021-05)
Article
Accés obertIn this work we address the compressible Navier-Stokes equations written in the so-called primitive formulation. The proposed methodology is a finite-element solver based on a fractional step scheme in time, which allows ... -
Dynamic term-by-term stabilized finite element formulation using orthogonal subgrid-scales for the incompressible Navier–Stokes problem
Castillo, Ernesto; Codina, Ramon (2019-06)
Article
Accés obertIn this paper, we propose and analyze the stability and the dissipative structure of a new dynamic term-by-term stabilized finite element formulation for the Navier–Stokes problem that can be viewed as a variational ... -
Element boundary terms in reduced order models for flow problems: domain decomposition and adaptive coarse mesh hyper-reduction
Reyes, Ricardo; Codina, Ramon (2020-08)
Article
Accés obertIn this paper we present a finite-element based reduced order model and, in particular, we consider two aspects related to the introduction of inter-element boundary terms in the formulation. The first is a domain decomposition ... -
Error analysis of discontinuous Galerkin methods for Stokes problem under minimal regularity
Badia, Santiago; Codina, Ramon; Gudi, Thirupathi; Guzmán, Johnny (2012)
Report de recerca
Accés obertIn this article, we analyze several discontinuous Galerkin methods (DG) for the Stokes problem under the minimal regularity on the solution. We assume that the velocity u belongs to [H1 0 ()]d and the pressure p 2 L2 0 ... -
Error estimates for a viscosity-splitting, finite element method for the incompressible Navier-Stokes equations
Blasco Lorente, Jorge; Codina, Ramon (2000)
Article
Accés obert -
Field-to-field coupled fluid structure interaction: a reduced order model study
Tello Guerra, Alexis; Codina, Ramon (2021-01)
Article
Accés obertThe standard Fluid-Structure Interaction (fsi) coupling, that uses as unknowns velocity and pressure for the fluid and displacements for the solid, is compared against two novel types of coupling, the first one a three-field ... -
Finite element analysis of hot rolling processes
Oñate Ibáñez de Navarra, Eugenio; Codina, Ramon (1993-10)
Report de recerca
Accés obert -
Finite element approximation of the three field formulation of the Stokes problem using arbitrary interpolations
Codina, Ramon (2008-07-16)
Article
Accés obertIn this paper we propose stabilized finite element methods for both Stokes’ and Darcy’s problems that accommodate any interpolation of velocities and pressures. Apart from the interest of this fact, the important issue is ... -
Finite element approximation of the viscoelastic flow problem: a non-residual based stabilized formulation
Castillo del Barrio, Ernesto; Codina, Ramon (Elsevier, 2017-01)
Article
Accés obertIn this paper, a three-field finite element stabilized formulation for the incompressible viscoelastic fluid flow problem is tested numerically. Starting from a residual based formulation, a non-residual based one is ... -
Finite element approximation of turbulent thermally coupled incompressible flows with numerical sub-grid scale modeling
Codina, Ramon; Principe, Ricardo Javier; Ávila, Matías (2009-08-14)
Article
Accés obertThe objective of this work is to describe a variational multiscale finite element approximation for the incompressible Navier-Stokes equations using the Boussinesq approximation to model thermal coupling. The main feature ... -
Finite element approximation of wave problems with correcting terms based on training artificial neural networks with fine solutions
Fabra Ruiz, Arnau; Baiges Aznar, Joan; Codina, Ramon (2022-09)
Article
Accés restringit per política de l'editorialIn this paper we present a general idea to correct coarse models by introducing a correcting term designed from fine solutions that can be then applied to situations in which a fine solution is not available. We apply this ... -
Finite element computation of diphthong sounds using tuned two-dimensional vocal tracts
Arnela, Marc; Guasch Fortuny, Oriol; Codina, Ramon; Espinoza Román, Héctor Gabriel (European Acoustics Association (EEA), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialFinite element methods (FEM) are increasingly being used to simulate the acoustics of the vocal tract. For vowel production, the irreducible wave equation for the acoustic pressure is typically solved. However, diphthong ... -
Finite element dynamical sub-grid scale approximation of low mach number flow equations
Ávila, Matias; Principe, Ricardo Javier; Codina, Ramon (2010)
Comunicació de congrés
Accés obert -
Finite element dynamical subgrid-scale model for low Mach number flows with radiative heat transfer
Ávila Salinas, Matias Oscar; Codina, Ramon; Principe, Ricardo Javier (2015)
Article
Accés restringit per política de l'editorialThe purpose of this paper is to present a finite element approximation of the low Mach number equations coupled with radiative equations to account for radiative heat transfer. For high-temperature flows this coupling can ... -
Finite element procedures for incompressible and compressible flows
Oñate Ibáñez de Navarra, Eugenio; Quintana Domínguez, Francisca; Codina, Ramon; Miguel López, José María (1991-10)
Report de recerca
Accés obert -
Fluid structure interaction by means of variational multiscale reduced order models
Tello Guerra, Alexis; Codina, Ramon; Baiges Aznar, Joan (2020-06)
Article
Accés obertA reduced order model designed by means of a variational multiscale stabilized formulation has been applied successfully to fluid-structure interaction problems in a strongly coupled partitioned solution scheme. Details ... -
Implementation of a stabilized finite element formulation for the incompressible Navier-Stokes equations based on a pressure gradient projection
Codina, Ramon; Blasco Lorente, Jorge; Buscaglia, G C; Huerta, Antonio (2001-10)
Article
Accés obertWe discuss in this paper some implementation aspects of a finite element formulation for the incompressible Navier-Stokes equations which allows the use of equal order velocity-pressure interpolations. The method consists ... -
Interpolation with restrictions between finite element meshes for flow problems in an ALE setting
Pont Ribas, Arnau; Codina, Ramon; Baiges Aznar, Joan (John Wiley & Sons, 2017-06)
Article
Accés obertThe need for remeshing when computing flow problems in domains suffering large deformations has motivated the implementation of a tool that allows the proper transmission of information between finite element meshes. Because ...