QUASIEQUILIBRIUM LATTICE BOLTZMANN MODELS WITH TUNABLE PRANDTL NUMBER FOR INCOMPRESSIBLE HYDRODYNAMICS

Chakradhar Thantanapally (), Shiwani Singh (), Dhiraj V. Patil (), Sauro Succi () and Santosh Ansumali ()
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Chakradhar Thantanapally: EMU, JNCASR, Jakkur, Bangalore 560064, India
Shiwani Singh: EMU, JNCASR, Jakkur, Bangalore 560064, India
Dhiraj V. Patil: EMU, JNCASR, Jakkur, Bangalore 560064, India
Sauro Succi: Istituto Applicazioni Calcolo "Mauro Picone", C.N.R., Via dei Taurini, 19, 00185, Rome, Italy
Santosh Ansumali: EMU, JNCASR, Jakkur, Bangalore 560064, India

International Journal of Modern Physics C (IJMPC), 2013, vol. 24, issue 12, 1-12

Abstract: Recently, it was shown that energy conserving (EC) lattice Boltzmann (LB) model is more accurate than athermal LB model for high-resolution simulations of athermal flows. However, in the sub-grid (SG) domain, the behavior is found to be opposite. In this work, we show that via multi-relaxation model, it is possible to preserve the accuracy of the EC LB for both SG and direct numerical simulation (DNS) models. We show that by introducing a nonunit Prandtl number, under-resolved simulations can also be performed quite efficiently, a property which we attribute to the enhanced sound-relaxation.

Keywords: Turbulence; lattice Boltzmann; direct numerical simulation; multi-relaxation; 47.27.ek; 47.11.+j; 05.20.Dd (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1142/S0129183113400044

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