Application of a parallel solver to the LES modelling of turbulent buoyant flows with heat transfer
Journal article, 2018

An existing fully implicit, non-dissipative direct numerical simulation (DNS) algorithm is reformulated to utilise the sub-grid scale (SGS) models in large eddy simulation (LES). The Favre-filtered equations with low-Mach number scaling are derived. The wall-adapting local eddy-viscosity (WALE) is used as SGS model. A fully parallel, finite volume solver is developed based on the resulting LES algorithm using PETSc library and applied to buoyancy- and thermally-driven transitional/turbulent flows in Rayleigh-Taylor instability and turbulent Rayleigh-Bénard convection. Results verify that the proposed low-Mach number LES approach, which is physically more accurate than pure incompressible methods for flows with variable properties, perfectly captures the evolution and complex physics of turbulent buoyant flows with or without heat transfer by taking the effects of density and viscosity changes into account without the Oberbeck-boussinesq (OB) assumption even at large temperature differences with uniform accuracy and efficiency.

Rayleigh-Taylor instability

Variable-density

RBC

WALE

Large eddy simulation

Wall-adapting local eddy-viscosity

Low-Mach

LES

RTI

Rayleigh-Bénard convection

Author

I yilmas

Istanbul Bilgi University

H saygin

Istanbul Aydın University

Lars Davidson

Chalmers, Mechanics and Maritime Sciences, Fluid Dynamics

Progress in Computational Fluid Dynamics

1468-4349 (ISSN) 1741-5233 (eISSN)

Vol. 18 2 89-107

Subject Categories

Applied Mechanics

Computational Mathematics

Fluid Mechanics and Acoustics

DOI

10.1504/PCFD.2018.090338

More information

Latest update

4/5/2018 1