Browsing by Author "Gorobets, Andrei"

A simple approach to discretize the viscous term with spatially varying (eddy)viscosity
Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (20131115)
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 ... 
Blending regularization and largeeddy simulation. From homogeneous isotropic turbulence to wind farm boundary layers
Folch Flórez, David; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (2013)
Conference lecture
Restricted access  publisher's policyThe incompressible NavierStokes equations form an excellent mathematical model for turbulent flows. However, direct simulations at high Reynolds numbers are not feasible because the convective term produces far too many ... 
Building proper invariants for eddyviscosity subgridscale models
Trias Miquel, Francesc Xavier; Folch, David; Gorobets, Andrei; Oliva Llena, Asensio (20150623)
Article
Open AccessDirect simulations of the incompressible NavierStokes equations are limited to relatively lowReynolds numbers. Hence, dynamically less complex mathematical formulations are necessary for coarsegrain simulations. ... 
Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 10(11)  Part I: Numerical methods and timeaveraged flow
Trias Miquel, Francesc Xavier; Gorobets, Andrei; Soria Guerrero, Manel; Oliva Llena, Asensio (20100131)
Article
Restricted access  publisher's policyA set of direct numerical simulations of a differentially heated cavity of aspect ratio 4 with adiabatic horizontal walls is presented. The five configurations selected here (Rayleigh numbers based on the cavity height ... 
Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 10(11)  Part II: Heat transfer and flow dynamics
Trias Miquel, Francesc Xavier; Gorobets, Andrei; Soria Guerrero, Manel; Oliva Llena, Asensio (20100131)
Article
Restricted access  publisher's policyThis is the second of a twopart paper on five direct numerical simulations of a differentially heated cavity of aspect ratio 4 with adiabatic horizontal walls (Rayleigh numbers based on the cavity height. The numerical ... 
DNS of turbulent natural convection flows on the MareNostrum supercomputer
Trias Miquel, Francesc Xavier; Gorobets, Andrei; Soria Guerrero, Manel; Oliva Llena, Asensio (2009)
Article
Restricted access  publisher's policyA code for the direct numerical simulation (DNS) of incompressible turbulent flows that provides a fairly good scalability for a wide range of computer architectures has been developed. The spatial discretization of the ... 
Efficiency of largescale CFD simulations on modern supercomputers using thousands of CPUS and hybrid MPI+OPENMP parallelization
Gorobets, Andrei; Borrell Pol, Ricard; Trias Miquel, Francesc Xavier; Kozubskaya, T.K.; Oliva Llena, Asensio (2010)
Conference lecture
Restricted access  publisher's policyThis work represents an experience in using the hybrid parallel model to perform largescale DNS. Advantages of the hybrid approach compared to the MPIonly approach are presented and discussed. The use of OpenMP in addition ... 
From extruded2D to fully3D geometries for DNS: a multigridbased extension of the Poisson solver
Gorobets, Andrei; Trias Miquel, Francesc Xavier; Soria Guerrero, Manel; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2010)
Article
Restricted access  publisher's policyDirect numerical simulation (DNS) of incompressible flows is an essential tool for improving the understanding of the physics of turbulence and for the development of better turbulence models. The Poisson equation, the ... 
Hybrid MPI+OpenMP parallelization of a NavierStokes solver for largescale DNS
Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Soria Guerrero, Manel; Oliva Llena, Asensio (2011)
Conference lecture
Restricted access  publisher's policyThis work presents a parallel NavierStokes solver for the largescale 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 FFTbased 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)
Conference report
Open AccessThis 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 FFTbased 3D Poisson solver with one periodic direction
Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (201110)
Article
Restricted access  publisher's policyThis 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 ... 
Parameterfree modelling of a turbulent differentially heated cavity with Rayleigh number up to 10e11
Trias Miquel, Francesc Xavier; Soria Guerrero, Manel; Gorobets, Andrei; Verstappen, R.W.C.P. (20090914)
Conference lecture
Restricted access  publisher's policySince 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 ... 
Parameterfree symmetrypreserving regularization modeling of a turbulent differentially heated cavity
Trias Miquel, Francesc Xavier; Verstappen, R.W.C.P.; Gorobets, Andrei; Soria Guerrero, Manel; Oliva Llena, Asensio (20100623)
Article
Restricted access  publisher's policySince direct numerical simulations of buoyancy driven flows cannot be computed at high Rayleigh numbers, a dynamically less complex mathematical formulation is sought. In the quest for such a formulation, we consider ... 
Regularization modeling of wallbounded turbulent flows
Trias Miquel, Francesc Xavier; Gorobets, Andrei; Verstappen, R.W.C.P.; Oliva Llena, Asensio (2010)
Conference lecture
Restricted access  publisher's policySince direct numerical simulations cannot be computed at high Reynolds numbers, a dynamically less complex formulation is sought. In the quest for such a formulation, we consider regularizations of the convective term ... 
Spectrallyconsistent regularization modeling at very high Rayleigh numbers
Trias Miquel, Francesc Xavier; Gorobets, Andrei; Verstappen, R.W.C.P.; Oliva Llena, Asensio (Begell House, 2012)
Conference report
Restricted access  publisher's policyThe incompressible NavierStokes equations constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively lowRayleigh numbers because ... 
Spectrallyconsistent regularization modeling of turbulent natural convection flows
Trias Miquel, Francesc Xavier; Verstappen, R.W.C.P.; Gorobets, Andrei; Oliva Llena, Asensio (Université de Poitiers, 2012)
Conference report
Open AccessThe incompressible NavierStokes equations constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively lowReynolds numbers because ... 
Spectrallyconsistent regularization modeling of wind farm boundary layers
Trias Miquel, Francesc Xavier; Folch, David; Gorobets, Andrei; Oliva Llena, Asensio (2012)
Conference report
Open AccessThe incompressible NavierStokes equations constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively lowReynolds numbers because ... 
Spectrallyconsistent regularization of turbulent RayleighBénard convection
Dabbagh, Firas; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (International Association for Computational Mechanics (IACM), 2014)
Conference report
Restricted access  publisher's policyDirect numerical simulation (DNS) of turbulent RayleighBénard convection in an air filled (Pr = 0,7) rectangular cell of squared crosssection with periodic boundary conditions in the spanwise direction, has been carried ... 
Symmetrypreserving regularization of wallbounded turbulent flows
Trias Miquel, Francesc Xavier; Gorobets, Andrei; Verstappen, Roel; Oliva Llena, Asensio (2011)
Article
Open AccessThe incompressible NavierStokes equations constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively lowReynolds numbers because ... 
Symmetrypreserving regularization of wallbounded turbulent flows
Trias Miquel, Francesc Xavier; Gorobets, Andrei; Verstappen, R.W.C.P.; Oliva Llena, Asensio (2011)
Conference lecture
Restricted access  publisher's policyThe incompressible NavierStokes equations constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively lowReynolds numbers because ...