Browsing by Author "Codina, Ramon"
Now showing items 1-20 of 100
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A finite Element model for incompressible flow problems
(Universitat Politècnica de Catalunya, 1992-06-30)
Doctoral thesis
Open Access -
A finite element reduced-order model based on adaptive mesh refinement and artificial neural networks
(John Wiley & sons, 2020-02)
Article
Open AccessIn this work, a reduced-order model based on adaptive finite element meshes and a correction term obtained by using an artificial neural network (FAN-ROM) is presented. The idea is to run a high-fidelity simulation by using ... -
A fractional step method for computational aeroacoustics using weak imposition of Dirichlet boundary conditions
(Elsevier, 2020-01)
Article
Open AccessIn this work we consider the approximation of the isentropic Navier–Stokes equations. The model we present is capable of taking into account acoustic and flow scales at once. After space and time discretizations have been ... -
A fractional-step method for the incompressible Navier-Stokes equations related to a predictor-multicorrector algorithm
(1998-12)
Article
Open AccessAn implicit fractional-step method for the numerical solution of the time-dependent incompressible Navier-Stokes equations in primitive variables is studied in this paper. The method, which is first-order-accurate in the ... -
A free surface finite element model for low Froude number mould filling problems on fixed meshes
(2011-07-10)
Article
Restricted access - publisher's policyThe simulation of low Froude number mould filling problems on fixed meshes presents significant difficulties. As the Froude number decreases, the coupling between the position of the interface and the resulting flow field ... -
A heuristic argument for the sole use of numerical stabilization with no physical LES modeling in the simulation of incompressible turbulent flows
(2009-07-14)
Article
Open AccessWe aim at giving support to the idea that no physical Large Eddy Simulation (LES) model should be used in the simulation of turbulent flows. It is heuristically shown that the rate of transfer of subgrid kinetic energy ... -
A mixed three-field FE formulation for stress accurate analysis including the incompressible limit
(2015-01)
Article
Open AccessIn previous works, the authors have presented the stabilized mixed displacement/pressure formulation to deal with the incompressibility constraint. More recently, the authors have derived stable mixed stress/displacement ... -
A nodal-based finite element approximation of the Maxwell problem suitable for singular solutions
(2009-11-17)
Article
Open AccessA new mixed finite element approximation of Maxwell’s problem is proposed, its main features being that it is based on a novel augmented formulation of the continuous problem and the introduction of a mesh dependent ... -
A nodal-based finite element approximation of the Maxwell problem suitable for singular solutions
(2012)
Article
Open AccessA new mixed finite element approximation of Maxwell’s problem is proposed, its main features being that it is based on a novel augmented formulation of the continuous problem and the introduction of a mesh dependent ... -
A numerical strategy to compute optical parameters in turbulent flow: application to telescopes
(2008-07-29)
Article
Open AccessWe present a numerical formulation to compute optical parameters in a turbulent air flow. The basic numerical formulation is a large eddy simulation (LES) of the incompressible Navier-Stokes equations, which are approximated ... -
A numerical strategy to compute optical parameters in turbulent flow: application to telescopes
(2010-01)
Article
Open AccessWe present a numerical formulation to compute optical parameters in a turbulent air flow. The basic numerical formulation is a large eddy simulation (LES) of the incompressible Navier–Stokes equations, which are approximated ... -
A posteriori error estimates in a finite element VMS-based reduced order model for the incompressible Navier-Stokes equations
(2021-03)
Article
Open AccessIn this paper we present an a posteriori error estimate for a reduced order model (ROM) for the incompressible Navier-Stokes equations that is based on the fact that the full order model is a finite element (FE) approximation. ... -
A pseudo-compressible variational multiscale solver for turbulent incompressible flows
(2016-12)
Article
Open AccessIn this work, we design an explicit time-stepping solver for the simulation of the incompressible turbulent flow through the combination of VMS methods and artificial compressibility. We evaluate the effect of the artificial ... -
A Sommerfeld non-reflecting boundary condition for the wave equation in mixed form
(2014-07-01)
Article
Restricted access - publisher's policyIn this paper we develop numerical approximations of the wave equation in mixed form supplemented with non-reflecting boundary conditions (NRBCs) of Sommerfeld-type on artificial boundaries for truncated domains. We consider ... -
A stabilised displacement–volumetric strain formulation for nearly incompressible and anisotropic materials
(2021-04)
Article
Open AccessThe simulation of structural problems involving the deformations of volumetric bodies is of paramount importance in many areas of engineering. Although the use of tetrahedral elements is extremely appealing, tetrahedral ... -
A stabilized finite element method for the mixed wave equation in an ALE framework with application to diphthong production
(2016-01)
Article
Open AccessWorking with the wave equation in mixed rather than irreducible form allows one to directly account for both, the acoustic pressure field and the acoustic particle velocity field. Indeed, this becomes the natural option ... -
A stabilized finite element method for the two-field and three-field Stokes eigenvalue problems
(2016-10)
Article
Open AccessIn this paper, the stabilized finite element approximation of the Stokes eigenvalue problems is considered for both the two-field (displacement–pressure) and the three-field (stress–displacement–pressure) formulations. The ... -
A stabilized mixed finite element approximation for incompressible finite strain solid dynamics using a total Lagrangian formulation
(2020-08)
Article
Open AccessIn this work a new methodology for both the nearly and fully incompressible transient finite strain solid mechanics problem is presented. To this end, the momentum equation is complemented with a constitutive law for the ... -
A stabilized mixed three-field formulation for stress accurate analysis including the incompressible limit in finite strain solid dynamics
(2023)
Article
Restricted access - publisher's policyIn this work a new methodology for finite strain solid dynamics problems for stress accurate analysis including the incompressible limit is presented. In previous works, the authors have presented the stabilized mixed ... -
A variational multiscale stabilized finite element formulation for Reissner–Mindlin plates and Timoshenko beams
(Elsevier, 2023-05)
Article
Open AccessThe theories for thick plates and beams, namely Reissner–Mindlin’s and Timoshenko’s theories, are well known to suffer numerical locking when approximated using the standard Galerkin finite element method for small ...
