Browsing by Author "Baiges Aznar, Joan"
Now showing items 21-40 of 47
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Finite element approximation of wave problems with correcting terms based on training artificial neural networks with fine solutions
(2022-09)
Article
Restricted access - publisher's policyIn 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
(2020-06)
Article
Open AccessA 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
(John Wiley & Sons, 2017-06)
Article
Open AccessThe 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
(2019-01)
Article
Open AccessAbstract 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
(2019-09)
Article
Open AccessThe 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 non-isothermal viscoelastic fluid flows using a VMS stabilized finite element formulation
(2021-10)
Article
Restricted access - publisher's policyThe 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
(John Wiley & Sons, 2015-03-02)
Article
Open AccessWe 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
(2019-11)
Article
Open AccessIn 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
(Springer, 2018-12)
Article
Open AccessIn 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
(2015-07-01)
Article
Open AccessIn 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
(2017-03)
Article
Open AccessIn 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
(2016-12)
Article
Open AccessThe 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
(Universitat Politècnica de Catalunya, 2007-06)
Minor thesis
Open AccessEls 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
(2019-02)
Article
Open AccessIn 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
(2020-08)
Article
Open AccessSome 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
(2021-05)
Article
Open AccessThe 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
(2018-07)
Article
Open AccessIn 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
(2008-07-30)
Article
Open AccessIn 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
(Universitat Politècnica de Catalunya, 2011-01-14)
Doctoral thesis
Open AccessThe 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
(2022-02)
Article
Restricted access - publisher's policyIn 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 ...
