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Parallel Direct Method of DNS for Two-Dimensional Turbulent Rayleigh-Bénard Convection

Published online by Cambridge University Press:  17 July 2017

Y. Bao ,
J. Luo  and
M. Ye
Y. Bao*
Affiliation:
Department of MechanicsSun Yat-sen UniversityGuangzhou, China
J. Luo
Affiliation:
Department of MechanicsSun Yat-sen UniversityGuangzhou, China
M. Ye
Affiliation:
Department of MechanicsSun Yat-sen UniversityGuangzhou, China
*
*Corresponding author ([email protected])
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Abstract

A highly efficient parallelization scheme of direct numerical simulation (DNS) for two-dimensional Rayleigh-Bénard convection is presented. By introducing the parallel diagonal dominant (PDD) algorithm to solve the pressure Poisson equation and adjusting the domain decomposition accordingly, all-to-all communication as the usual obstacle to parallel computing can be eliminated. Excellent strong scaling and weak scaling for the parallel efficiency are achieved. Numerical results show that very complex structures in flow exist at very high Ra numbers. The required high resolution both in space and in time can be obtained by the present method at low parallel overhead.

Keywords

PDM-DNSParallel computationRayleigh-Bénard convectionTurbulence
Type
Research Article
Information
Journal of Mechanics , Volume 34 , Issue 2 , April 2018 , pp. 159 - 166
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2018 

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