Exploració per autor "Gorobets, Andrei"

Ara es mostren els items 34-53 de 80

    • HPC² - A fully-portable, algebra-based framework for heterogeneous computing. Application to CFD 

      Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Oyarzun Altamirano, Guillermo (Elsevier, 2018-09)
      Article
      Accés obert
      The 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 

      Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Soria Guerrero, Manel; Oliva Llena, Asensio (2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This 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 

      Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Soria Guerrero, Manel; Oliva Llena, Asensio (2011)
      Text en actes de congrés
      Accés obert
      This 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 

      Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (2011-10)
      Article
      Accés restringit per política de l'editorial
      This 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 

      Álvarez Farré, Xavier; Valle Marchante, Nicolás; Gorobets, Andrei; Trias Miquel, Francesc Xavier (2018)
      Text en actes de congrés
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      During 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 

      Trias Miquel, Francesc Xavier; Gorobets, Andrei; Pérez Segarra, Carlos David; Oliva Llena, Asensio (International Association for Computational Mechanics (IACM), 2014)
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      Direct 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 

      Pont Vilchez, Arnau; Duben, Alexey; Gorobets, Andrei; Revell, Alistair; Oliva Llena, Asensio; Trias Miquel, Francesc Xavier (2021-09)
      Article
      Accés obert
      This 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 

      Dabbagh, Firas; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (Institute of Physics (IOP), 2016)
      Text en actes de congrés
      Accés obert
      At 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 

      Martín Navarrete, Rocío; Soria Guerrero, Manel; Lehmkuhl Barba, Oriol; Gorobets, Andrei; Cante Terán, Juan Carlos; Vidal Pairot, Pere (2018)
      Text en actes de congrés
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      The 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 

      Martín Navarrete, Rocío; Soria Guerrero, Manel; Lehmkuhl Barba, Oriol; Duben, Alexey; Gorobets, Andrei (2019-09-17)
      Article
      Accés obert
      The 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 

      Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2021)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The 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 

      Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2021)
      Text en actes de congrés
      Accés obert
      The 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 

      Trias Miquel, Francesc Xavier; Gorobets, Andrei; Soria Guerrero, Manel; Oliva Llena, Asensio (2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This 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 

      Trias Miquel, Francesc Xavier; Dabbagh, Firas; Gorobets, Andrei; Oliva Llena, Asensio (2018)
      Text en actes de congrés
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      Small-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 

      Trias Miquel, Francesc Xavier; Dabbagh, Firas; Gorobets, Andrei; Oliet Casasayas, Carles (Springer, 2020-03-26)
      Article
      Accés obert
      In 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 

      Trias Miquel, Francesc Xavier; Dabbagh, Firas; Gorobets, Andrei; Oliva Llena, Asensio (2019)
      Text en actes de congrés
      Accés restringit per política de l'editorial

    • On a Proper Tensorial Subgrid Heat Flux Model 

      Trias Miquel, Francesc Xavier; Dabbagh, Firas; Santos Serrano, Daniel; Gorobets, Andrei; Oliva Llena, Asensio (2021)
      Text en actes de congrés
      Accés obert
      In 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 

      Alsalti Baldellou, Àdel; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (International Centre for Numerical Methods in Engineering (CIMNE), 2021)
      Text en actes de congrés
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      It 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 

      Álvarez Farré, Xavier; Alsalti Baldellou, Àdel; Gorobets, Andrei; Oliva Llena, Asensio; Trias Miquel, Francesc Xavier (Parallel Computational Fluid Dynamics (ParCFD), 2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Sparse 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 

      Folch, David; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (International Association for Computational Mechanics (IACM), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Direct 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, ...