Browsing by Author "Trias Miquel, Francesc Xavier"
Now showing items 1-20 of 155
-
A 3D symmetry-preserving simulation of a concentrated photovoltaic thermal (CPVT) solar collector
Santos Serrano, Daniel; Rigola Serrano, Joaquim; Castro González, Jesús; Trias Miquel, Francesc Xavier (Institute of Physics (IOP), 2024)
Conference report
Open AccessIn this work, a general collocated and unconditionally stable framework on unstructured meshes for solving Conjugate Heat Transfer (CHT) problems is presented by means of preserving the underlying symmetries of the continuous ... -
A CFD-based surrogate model for predicting flow parameters in a ventilated room using sensor readings
Morozova, Nina; Trias Miquel, Francesc Xavier; Capdevila Paramio, Roser; Schillaci, Eugenio; Oliva Llena, Asensio (2022-07-01)
Article
Open AccessIn this work, we develop a computational fluid dynamics (CFD)-based surrogate model, which predicts flow parameters under different geometrical configurations and boundary conditions in a benchmark case of a mechanically ... -
A checkerboard-free symmetry-preserving conservative method for magnetohydrodynamic flows
Hopman, Johannes Arend; Trias Miquel, Francesc Xavier; Rigola Serrano, Joaquim (Institute of Physics (IOP), 2024)
Conference report
Open AccessSimulating MHD flows at high Hartmann numbers and low magnetic Reynolds numbers is of high interest for the design of a nuclear fusion breeding blanket, for which high accuracy and conservation of physical properties are ... -
A General Method to Compute Numerical Dispersion Error
Ruano Pérez, Jesús; Baez Vidal, Aleix; Rigola Serrano, Joaquim; Trias Miquel, Francesc Xavier (2021)
Conference report
Open AccessThis article presents a new methodology to compute numerical dispersion error. The analysis here presented is not restricted to uniform structured meshes nor linear discrete operators as it does not rely on sinusoids to ... -
A hierarchical parallel implementation for heterogeneous computing. Application to algebra-based CFD simulations on hybrid supercomputers
Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier (Elsevier, 2021-01)
Article
Open AccessThe quest for new portable implementations of simulation algorithms is motivated by the increasing variety of computing architectures. Moreover, the hybridization of high-performance computing systems imposes additional ... -
A highly portable heterogeneous implementation of a Poisson solver for flows with one periodic direction
Alsalti Baldellou, Àdel; Trias Miquel, Francesc Xavier; Álvarez Farré, Xavier; Oliva Llena, Asensio (2021)
Conference report
Restricted access - publisher's policyThe portability of codes has become a major advantage given the continuous development of new architectures for numerical applications, as well as the progressive incorporation of accelerators in modern supercomputers. ... -
A new general method to compute dispersion errors on Cartesian stretched meshes for both linear and non-linear operators
Ruano Pérez, Jesús; Baez Vidal, Aleix; Rigola Serrano, Joaquim; Trias Miquel, Francesc Xavier (2022-02-01)
Article
Restricted access - publisher's policyThe present article presents a new analysis for the dispersion error and the methodology to evaluate it numerically. Here we present the spectral properties of several convective schemes, including non-linear ones, on ... -
A new subgrid characteristic length for turbulence simulations on anisotropic grids
Trias Miquel, Francesc Xavier; Gorobets, Andrei; Silvis, Maurits; Verstappen, Roel W.C.P.; Oliva Llena, Asensio (2017-11-29)
Article
Open AccessDirect numerical simulations of the incompressible Navier-Stokes equations are not feasible yet for most practical turbulent flows. Therefore, dynamically less complex mathematical formulations are necessary for coarse-grained ... -
A priori study of subgrid-scale features in turbulent Rayleigh-Bénard convection
Dabbagh, Firas; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (2017-10-06)
Article
Open AccessAt the crossroad between flow topology analysis and turbulence modeling, a priori studies are a reliable tool to understand the underlying physics of the subgrid-scale (SGS) motions in turbulent flows. In this paper, ... -
A Projected Ghost Fluid Method for a mimetic approach for extreme contrast interfaces in multiphase flows
Valle Marchante, Nicolás; Trias Miquel, Francesc Xavier; Castro González, Jesús; Oliva Llena, Asensio (2018)
Conference report
Restricted access - publisher's policyIn the context of a multimaterial domain, the GFM for the Laplacian operator is reformulated from an algebraic perspective, where operators are represented by matrices. From this perspective, a whole new level of analysis ... -
A pure virtual approach for managing platform portability on hybrid supercomputers
Álvarez Farré, Xavier; Gorobets, Andrei; Alsalti Baldellou, Àdel; Trias Miquel, Francesc Xavier (2019)
Conference report
Restricted access - publisher's policyCommonly, the development of scientific computing software follows a stencilbased approach: the numerical methods and algorithms are introduced into computing systems through stencil data structures and sweeps (i.e. ... -
A self-adaptive strategy for the time integration of navier-stokes equations
Trias Miquel, Francesc Xavier; Lehmkuhl Barba, Oriol (2011-08)
Article
Restricted access - publisher's policyAn efficient self-adaptive strategy for the explicit time integration of Navier-Stokes equations is presented. Unlike the conventional explicit integration schemes, it is not based on a standard CFL condition. Instead, the ... -
A simple approach to discretize the viscous term with spatially varying (eddy-)viscosity
Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (2013-11-15)
Article
Restricted access - publisher's policyA simple approach to discretize the viscous dissipation term in the incompressible Navier–Stokes equations with spatially varying viscosity is presented. Unlike the case where the viscosity remains constant, its discretization ... -
A simple optimization approach for the insulation thickness distribution in household refrigerators
Trias Miquel, Francesc Xavier; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (Elsevier, 2018-09)
Article
Open AccessDetermination of the optimal insulation thickness is of great relevance in many thermal engineering applications. In this paper, a simple optimization strategy based on the Lagrange multipliers is presented. The optimal ... -
A symmetry-preserving second-order time-accurate PISO-based method
Komen, E.M.J.; Hopman, Johannes Arend; Frederix, E.M.A.; Trias Miquel, Francesc Xavier; Verstappen, Roel W.C.P. (Elsevier, 2021-07-15)
Article
Open AccessA new conservative symmetry-preserving second-order time-accurate PISO-based pressure-velocity coupling for solving the incompressible Navier-Stokes equations on unstructured collocated grids is presented in this paper. ... -
A time-average filtering technique to improve the efficiency of two-layer wall models for large eddy simulation in complex geometries
Calafell Sandiumenge, Joan; Trias Miquel, Francesc Xavier; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (Elsevier, 2019-06-30)
Article
Open AccessTwo-Layer wall models have been recurrently studied since they represent a good physical model for Large Eddy Simulations with underresolved wall regions. Specifically, those based on the Reynolds Averaged Navier-Stokes ... -
Advanced techniques for grau area mitigation in DES simulations and their effectes on the subsonic round jet acoustic spectra
Duben, Alexey; Ruano Pérez, Jesús; Trias Miquel, Francesc Xavier; Rigola Serrano, Joaquim (2021)
Conference report
Restricted access - publisher's policyThe research dedicated to the investigation of different gray-area mitigation approaches towards accurate aerodynamics and aeroacoustics is presented. The recent modifications of hybrid RANS-LES DDES approach based on ... -
Algebraic implementation of a flux limiter for heterogeneous computing
Valle Marchante, Nicolás; Álvarez Farré, Xavier; Trias Miquel, Francesc Xavier; Castro González, Jesús; Oliva Llena, Asensio (2018)
Conference report
Restricted access - publisher's policy -
An efficient strategy of parcel modeling for polydispersed multiphase turbulent flows
Bahramian, Linda; Muela Castro, Jordi; Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Trias Miquel, Francesc Xavier (Scipedia, 2022)
Conference report
Open AccessA three-dimensional particle-laden two-phase turbulent flow by employing the Eulerian-Lagrangian method using multiphase Particle-In-Cell model is implemented to analyze the effects of parcel modeling. In order to achieve ... -
An efficient Two-Layer wall model for accurate numerical simulations of aeronautical applications
Calafell Sandiumenge, Joan; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2019)
Conference report
Open AccessTwo-Layer wall models have been widely studied since they allow wall modeled Large Eddy Simulationsof general non-equilibrium flows. However, they are plagued by two persistent problems, the "log-layermismatch" and the ...