Exploració per autor "Baiges Aznar, Joan"
Ara es mostren els items 33-52 de 53
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Parameter-free, weak imposition of Dirichlet boundary conditions and coupling of trimmed and non-conforming patches
Kollmannsberger, Stefan; Oezcan, A; Baiges Aznar, Joan; Ruess, M; Rank, Ernst; Reali, A (John Wiley & Sons, 2015-03-02)
Article
Accés obertWe present a parameter-free domain sewing approach for low-order as well as high-order finite elements. Its final form contains only primal unknowns; that is, the approach does not introduce additional unknowns at the ... -
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 ... -
Refficientlib: an efficient load-rebalanced adaptive mesh refinement algorithm for high-performance computational physics meshes
Baiges Aznar, Joan; Bayona Roa, Camilo Andrés (2017-03)
Article
Accés obertIn this paper we present a novel algorithm for adaptive mesh refinement in computational physics meshes in a distributed memory parallel setting. The proposed method is developed for nodally based parallel domain partitions ... -
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 ... -
Simulació de la qualitat de la visió al voltant d'un telescopi
Baiges Aznar, Joan (Universitat Politècnica de Catalunya, 2007-06)
Tesina
Accés obertEls telescopis astronòmics recullen els raigs de llum procedents dels objectes celests i els transformen en imatges el més nítides possible. No obstant, al travessar l’atmosfera, aquests raigs de llum pateixen tot un seguit ... -
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 ... -
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 ... -
Stationary and time-dependent numerical approximation of the lid-driven cavity problem for power-law fluid flows at high Reynolds numbers using a stabilized finite element formulation of the VMS type
Aguirre, A.; Castillo, Ernesto; Cruchaga, Marcela A.; Codina, Ramon; Baiges Aznar, Joan (2018-07)
Article
Accés obertIn this work, a variational multiscale finite element formulation is used to approximate numerically the lid-driven cavity flow problem for high Reynolds numbers. For Newtonian fluids, this benchmark case has been extensively ... -
The Fixed-Mesh ALE approach for the numerical approximation of flows in moving domains
Codina, Ramon; Houzeaux, Guillaume; Coppola Owen, Ángel H.; Baiges Aznar, Joan (2008-07-30)
Article
Accés obertIn this paper we propose a method to approximate flow problems in moving domains using always a given grid for the spatial discretization, and therefore the formulation to be presented falls within the category of ... -
The Fixed-Mesh ALE method applied to multiphysics problems using stabilized formulations
Baiges Aznar, Joan (Universitat Politècnica de Catalunya, 2011-01-14)
Tesi
Accés obertThe finite element method is a tool very often employed to deal with the numerical simulation of multiphysics problems.Many times each of these problems can be attached to a subdomain in space which evolves in time. Fixed ... -
Topological derivative-based topology optimization of incompressible structures using mixed formulations
Castañar Pérez, Inocencio; Baiges Aznar, Joan; Codina, Ramon; Venghaus, Henning (2022-02)
Article
Accés obertIn this work an algorithm for topological optimization, based on the topological derivative concept, is proposed for both nearly and fully incompressible materials. In order to deal with such materials, a new decomposition ... -
Unified solver for fluid dynamics and aeroacoustics in isentropic gas flows
Pont Ribas, Arnau; Codina, Ramon; Baiges Aznar, Joan; Guasch Fortuny, Oriol (2018-06)
Article
Accés obertThe high computational cost of solving numerically the fully compressible Navier–Stokes equations, together with the poor performance of most numerical formulations for compressible flow in the low Mach number regime, has ... -
Variational multi-scale finite element approximation of the compressible Navier-Stokes equations
Bayona Roa, Camilo Andrés; Baiges Aznar, Joan; Codina, Ramon (2016-03)
Article
Accés restringit per política de l'editorialPurpose - The purpose of this paper is to apply the variational multi-scale framework to the finite element approximation of the compressible Navier-Stokes equations written in conservation form. Even though this formulation ... -
Variational multiscale approximation of the one-dimensional forced Burgers equation: the role of orthogonal subgrid scales in turbulence modeling
Bayona Roa, Camilo Andrés; Baiges Aznar, Joan; Codina, Ramon (2018-02)
Article
Accés obertA numerical approximation for the one-dimensional Burgers equation is proposed by means of the orthogonal subgrid scales–variational multiscale (OSGS-VMS) method. We evaluate the role of the variational subscales in ... -
Variational multiscale based dissipation models for the estimation of atmospheric seeing
Baiges Aznar, Joan; Codina, Ramon (Elsevier, 2015-01)
Article
Accés obertIn this work we present a numerical model for the estimation of atmospheric seeing in observation sites. The particularity of the method is that it is based on a Variational Multiscale turbulence model, its main feature ... -
Variational Multiscale error estimators for solid mechanics adaptive simulations: an Orthogonal Subgrid Scale approach
Baiges Aznar, Joan; Codina, Ramon (2017-10)
Article
Accés obertIn this work we present a general error estimator for the finite element solution of solid mechanics problems based on the Variational Multiscale method. The main idea is to consider a rich model for the subgrid scales as ... -
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
Accés obertThis 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, ...