Exploració per autor "Baiges Aznar, Joan"
Ara es mostren els items 24-43 de 53
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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 ... -
Experimental and numerical modeling of a sloshing problem in a stepped based rectangular tank
Gandara Imilqueo, Tomás; Castillo del Barrio, Ernesto; Cruchaga, Marcela A.; Baiges Aznar, Joan (2021-03)
Article
Accés obertIn this study, the two-dimensional sloshing of water in a stepped based tank partially filled was analyzed using an arbitrary Lagrangian–Eulerian adaptive fixed-mesh method and including the Smagorinsky turbulence model. ... -
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 ... -
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 ... -
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 ... -
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 obertAbstract 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 ... -
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 ... -
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) ... -
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 ...