Exploració per autor "Gorobets, Andrei"
Ara es mostren els items 38-57 de 80
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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 ... -
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 ... -
Noise Radiated by an Open Cavity at Low Mach Number
(2018)
Text en actes de congrés
Accés restringit per política de l'editorialThe present work focuses on the study of noise generation and radiation of unsteady laminar flow over an open three dimensional cavity at low Mach number, that is of interest to understand noise generation mechanisms in ... -
Noise radiated by an open cavity at low Mach number: Effect of the cavity oscillation mode
(2019-09-17)
Article
Accés obertThe present work focuses on the study of noise generation and radiation of an infinite open three-dimensional cavity at low Mach number with laminar upstream conditions that is of interest to understand noise generation ... -
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 simulation of turbulence at lower costs: regularization modeling
(2011)
Comunicació de congrés
Accés restringit per política de l'editorialThis work is devoted to the development of efficient methods for the numerical simulation of incompressible flows on modern supercomputers. Direct simulation of the Navier-Stokes equations is nowadays an essential tool ... -
On a physically-consistent nonlinear subgrid-scale heat flux model for LES of buoyancy driven flows
(2018)
Text en actes de congrés
Accés restringit per política de l'editorialSmall-scale dynamics is the spirit of turbulence physics. It delivers complex mechanisms when turbulence is purely sustained by buoyancy. This takes place in Rayleigh-Bénard convection (RBC). Most of the existing RBC ... -
On a Proper Tensor-Diffusivity Model for Large-Eddy Simulation of Buoyancy-Driven Turbulence
(Springer, 2020-03-26)
Article
Accés obertIn this work, we aim to shed light to the following research question: can we find a nonlinear tensorial subgrid-scale (SGS) heat flux model with good physical and numerical properties, such that we can obtain satisfactory ... -
On a proper tensor-diffusivity model for large-eddy simulations of buoyancy driven flows
(2019)
Text en actes de congrés
Accés restringit per política de l'editorial -
On a Proper Tensorial Subgrid Heat Flux Model
(2021)
Text en actes de congrés
Accés obertIn this work, we aim to shed light to the following research question: can we find a nonlinear tensorial subgrid-scale (SGS) heat flux model with good physical and numerical properties, such that we can obtain satisfactory ... -
On Preconditioning Variable Poisson Equation with Extreme Contrasts in the Coefficients
(International Centre for Numerical Methods in Engineering (CIMNE), 2021)
Text en actes de congrés
Accés obertIt is well known that the solution by means of iterative methods of very ill-conditioned systems leads to very poor convergence rates. In this context, preconditioning becomes crucial in order to modify the spectrum of the ... -
On the benefits and applications of sparse matrix-matrix product on various parallel architectures
(Parallel Computational Fluid Dynamics (ParCFD), 2022)
Text en actes de congrés
Accés restringit per política de l'editorialSparse matrix-vector multiplications are essential in the numerical resolution of partial differential equations. However, the sparse matrix-vector product is a strongly memory-bound kernel that suffers from data starving. ... -
On the blending of regularization and large-eddy simulation
(International Association for Computational Mechanics (IACM), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialDirect simulations of the incompressible Navier-Stokes equations at high Reynolds numbers are not feasible because the convective term produces far too many relevant scales of motion. Therefore, in the foreseeable future, ... -
On the effect of prandtl number to subgrid-scale heat flux models
(Scipedia, 2022)
Text en actes de congrés
Accés obertEstimations of the grid size and computational cost for direct numerical simulation (DNS) and large-eddy simulation (LES) of Rayleigh-Bénard convection (RBC) are presented in the {Ra, P r} phase space. Computational ... -
On the evolution of flow topology in turbulent Rayleigh-Bénard convection
(2016-11-22)
Article
Accés obertSmall-scale dynamics is the spirit of turbulence physics. It implicates many attributes of flow topology evolution, coherent structures, hairpin vorticity dynamics, and mechanism of the kinetic energy cascade. In this work, ... -
On the implementation of flux limiters in algebraic frameworks
(2022-02-01)
Article
Accés obertThe use of flux limiters is widespread within the scientific computing community to capture shock dis- continuities and are of paramount importance for the temporal integration of high-speed aerodynamics, multiphase flows ... -
Parameter-free modelling of a turbulent differentially heated cavity with Rayleigh number up to 10e11
(2009-09-14)
Comunicació de congrés
Accés restringit per política de l'editorialSince direct numerical simulations of natural convection in a differentially heated cavity cannot be performed at high Rayleigh numbers, a dynamically less complex mathematical formulation is sought. In the quest for such ...
