Browsing by Author "Gorobets, Andrei"
Now showing items 1-20 of 76
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A hierarchical parallel implementation for heterogeneous computing. Application to algebra-based CFD simulations on hybrid supercomputers
(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 new subgrid characteristic length for turbulence simulations on anisotropic grids
(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
(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 pure virtual approach for managing platform portability on hybrid supercomputers
(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 simple approach to discretize the viscous term with spatially varying (eddy-)viscosity
(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 ... -
An OpenCL-based parallel CFD code for simulations on hybrid systems with massively-parallel accelerators
(Elsevier, 2013)
Conference report
Open AccessA parallel finite-volume CFD algorithm for modeling of incompressible flows on hybrid supercomputers is presented. It is based on a symmetry-preserving high-order numerical scheme for structured meshes. A multilevel ... -
Blending regularization and large-eddy simulation. From homogeneous isotropic turbulence to wind farm boundary layers
(2013)
Conference lecture
Restricted access - publisher's policyThe incompressible Navier-Stokes 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 a new subgrid characteristic length for LES
(Keldysh Institute of Applied Mathematics, 2016)
Conference report
Restricted access - publisher's policy -
Building a proper tensor-diffusivity model for large-eddy simulation of buoyancy-driven flows
(International Centre for Numerical Methods in Engineering (CIMNE), 2018)
Conference report
Restricted access - publisher's policyIn this work, we plan to shed light on the following research question: can we ¿nd a nonlinear tensorial subgrid-scale (SGS) heat ¿ux model with good physical and numerical properties, such that we can obtain satisfactory ... -
Building proper invariants for eddy-viscosity subgrid-scale models
(2015-06-23)
Article
Open AccessDirect simulations of the incompressible Navier-Stokes equations are limited to relatively low-Reynolds numbers. Hence, dynamically less complex mathematical formulations are necessary for coarse-grain simulations. ... -
Building proper invariants for large eddy simulation
(Springer, 2015)
Conference report
Restricted access - publisher's policy -
Building proper invariants for subgrid-scale eddy-viscosity models
(2015)
Conference report
Restricted access - publisher's policySince direct simulations of the incompressible Navier-Stokes equations are limited to relatively low-Reynolds numbers, dynamically less complex mathematical formulations are necessary for coarse-grain simulations. ... -
Development of a low-level, algebra-based library to provide platform portability on hybrid supercomputers
(Scipedia, 2022)
Conference report
Open AccessContinuous enhancement in hardware technologies enables scientific computing to advance incessantly and reach further aims. Since the start of the global race for exascale high-performance computing, massively-parallel ... -
Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 10(11) - Part I: Numerical methods and time-averaged flow
(2010-01-31)
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
(2010-01-31)
Article
Restricted access - publisher's policyThis is the second of a two-part 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 ... -
Direct numerical simulation of a fully developed turbulent square duct flow up to Re-tau=1200
(2015-08-01)
Article
Open AccessVarious fundamental studies based on a turbulent duct flow have gained popularity including heat transfer, magnetohydrodynamics as well as particle-laden transportation. An accurate prediction on the turbulent flow field ... -
Direct numerical simulation of backward-facing step flow at Ret = 395 and expansion ratio 2
(2019-03-25)
Article
Open AccessBackward-facing step (BFS) constitutes a canonical configuration to study wallbounded flows subject to massive expansions produced by abrupt changes in geometry. Recirculation flow regions are common in this type of flow, ... -
Direct numerical simulation of turbulent flows with parallel algorithms for various computing architectures
(International Association for Computational Mechanics (IACM), 2014)
Conference report
Restricted access - publisher's policyThe purpose of the work is twofold. Firstly, it is devoted to the development of efficient parallel algorithms for large-scale simulations of turbulent flows on different supercomputer architectures. It reports experience ... -
DNS and LES on unstructured grids: playing with matrices to preserve symmetries using a minimal set of algebraic kernels
(Scipedia, 2022)
Conference report
Open AccessThe essence of turbulence are the smallest scales of motion. They result from asubtle balance between two differential operators differing in symmetry: The convective operator is skew-symmetric, whereas the diffusive is ... -
DNS and regularization modeling of a turbulent differentially heated cavity of aspect ratio 5
(2013-01-15)
Article
Open AccessThis work is devoted to the study of turbulent natural convection flows in differentially heated cavities. The adopted configuration corresponds to an airfilled (Pr = 0.7) cavity of aspect ratio 5 and Rayleigh number Ra ...
