Exploració per autor "Trias Miquel, Francesc Xavier"
Ara es mostren els items 71-90 de 150
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HPC² - A fully-portable, algebra-based framework for heterogeneous computing. Application to CFD
(Elsevier, 2018-09)
Article
Accés obertThe variety of computing architectures competing in the exascale race makes the portability of codes of major importance. In this work, the HPC2 code is presented as a fully-portable, algebra-based framework suitable for ... -
Hybrid MPI+OpenMP parallelization of a Navier-Stokes solver for large-scale DNS
(2011)
Comunicació de congrés
Accés restringit per política de l'editorialThis work presents a parallel Navier-Stokes solver for the large-scale direct numerical simulation (DNS) of incompressible flows with one periodic direction. It is based on a scalable Poisson solver that combines an FFT ... -
Hybrid MPI+OpenMP parallelization of an FFT-based 3D Poisson solver that can reach 100000 CPU cores
(2011)
Text en actes de congrés
Accés obertThis work is devoted to the development of efficient parallel algorithms for the direct numerical simulation (DNS) of incompressible flows on modern supercomputers. A Poisson solver for problems with one uniform periodic ... -
Hybrid MPI+OpenMP parallelization of an FFT-based 3D Poisson solver with one periodic direction
(2011-10)
Article
Accés restringit per política de l'editorialThis work is devoted to the development of efficient parallel algorithms for the direct numerical simulation (DNS) of incompressible flows on modern supercomputers. In doing so, a Poisson equation needs to be solved at ... -
Implementation of a flux-limiter into a fully-portable, algebra-based framework for heterogeneous computing
(2018)
Text en actes de congrés
Accés restringit per política de l'editorialDuring the last years, there has been a signi¿cant increment in the variety of hardware to overcome the power constraint in the context of the exascale challenge. This progress is leading to an increasing hybridisation of ... -
Improving DES capabilities for predicting Kelvin-Helmholtz instabilities. Comparison with a backward-facing step DNS.
(2020-05-10)
Text en actes de congrés
Accés restringit per política de l'editorialThe Detached Eddy Simulation (DES) turbulence model presented by Spalart et al. (Comments on the Feasibility of LES for Wings, and on a Hybrid RANS/LES Approach, [1]) in the late 90s, was specifically designed to simulate ... -
Investigating the capabilities of CFD-based data-driven models for indoor environmental design and control
(International Centre for Numerical Methods in Engineering (CIMNE), 2021)
Text en actes de congrés
Accés obertIn this work, we study the accuracy of CFD-based data-driven models, which predict comfort-related flow parameters in a ventilated cavity with a heated floor. We compare the computational cost and accuracy of three different ... -
Large eddy and direct numerical simulations of a turbulent water-filled differentially heated cavity of aspect ratio 5
(2014-10-01)
Article
Accés obertNatural convection in a differentially heated cavity is characterized by different phenomena such as laminar to turbulent flow transition in the boundary layer, turbulent mixing, and thermal stratification in the core of ... -
Lighter and faster simulations on domains with symmetries
(Elsevier, 2024-05-15)
Article
Accés obertA strategy to improve the performance and reduce the memory footprint of simulations on meshes with spatial reflection symmetries is presented in this work. By using an appropriate mirrored ordering of the unknowns, discrete ... -
Low-rank corrections for increasing the arithmetic intensity of the preconditioners
(Parallel Computational Fluid Dynamics (ParCFD), 2023)
Text en actes de congrés
Accés restringit per política de l'editorialSpatial reflection symmetries are common in many academic and industrial CFD configurations. Given a mesh with s symmetries, it is possible to transform Poisson’s equation into a set of 2^s fully-decoupled subsystems. By ... -
Memory aware poisson solver for peta-scale simulations with one FFT diagonalizable direction
(Institute of Electrical and Electronics Engineers (IEEE), 2017)
Text en actes de congrés
Accés obertProblems with some sort of divergence constraint are found in many disciplines: computational fluid dynamics, linear elasticity and electrostatics are examples thereof. Such a constraint leads to a Poisson equation which ... -
New differential operators and discretization methods for large-eddy simulation and regularization modeling
(International Association for Computational Mechanics (IACM), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialDirect numerical simulations (DNS) of the incompressible Navier-Stokes equations are limited to relatively low-Reynolds numbers. Therefore, dynamically less complex mathematical formulations are necessary for coarse-grain ... -
New Strategies for Mitigating the Gray Area in Delayed-Detached Eddy Simulation Models
(2021-09)
Article
Accés obertThis paper presents a new approach for mitigating the unphysical delay in the Reynolds-averaged Navier–Stokes (RANS) to large-eddy simulation (LES) transition, often referred to as the gray area, which is a common issue ... -
New subgrid-scale models for large-eddy simulation of Rayleigh-Bénard convection
(Institute of Physics (IOP), 2016)
Text en actes de congrés
Accés obertAt the crossroad between flow topology analysis and the theory of turbulence, a new eddy-viscosity model for Large-eddy simulation has been recently proposed by Trias et al.[PoF, 27, 065103 (2015)]. The S3PQR-model has the ... -
Non-Oberbeck-Boussinesq effects in a turbulent tall water-filled differentially heated cavity
(Begell House, 2015)
Text en actes de congrés
Accés restringit per política de l'editorialThe present work studies the non-Oberbeck-Boussinesq (NOB) effects in a tall water-filled differentially heated cavity by means of direct numerical simulation. The obtained results reveal significant NOB effects for this ... -
NUMA-Aware strategies for the efficient execution of CFD simulations on CPU supercomputers
(2021)
Text en actes de congrés
Accés restringit per política de l'editorialThe growing variety of computing architectures and the hybridization of high-performance computing systems encourage the research for portable implementations of numerical methods in simulation codes. However, the pursuit ... -
NUMA-Aware Strategies for the Heterogeneous Execution of SPMV on Modern Supercomputers
(2021)
Text en actes de congrés
Accés obertThe sparse matrix-vector product is a widespread operation amongst the scientific computing community. It represents the dominant computational cost in many large-scale simulations relying on iterative methods, and its ... -
Numerical analysis of parcel tracking in large eddy simulation of polydispersed multiphase flows: assessment of different parcel modeling techniques
(2023)
Text en actes de congrés
Accés restringit per política de l'editorialIn order to assess the impacts of parcel modeling, the Eulerian-Lagrangian method, by using the Particle-In-Cell model, is implemented for a three-dimensional polydispersed two-phase turbulent flow. First, the benchmark ... -
Numerical assessment of parcel modeling in large eddy simulation for dispersed multiphase flows
(2023)
Text en actes de congrés
Accés obertThe particle-laden turbulent flow benchmark case of a confined jet by Hishida (1987) was selected for validation purposes of the Eulerian-Lagrangian method in Large Eddy Simulation (LES). After validation, a particle size ...
