Lattice Boltzmann Simulation of Double Diffusive Natural Convection in an Enclosure with Soret and Dufour Effects

doi:10.19596/j.cnki.1001-246x.7658

Abstract

Abstract: We adopt lattice Boltzmann method to investigate double diffusive natural convection around a heated cylinder in an enclosure with Soret and Dufour effects. The inner heated cylinder is located at center of a square enclosure and four surrounding walls are assumed with low temperature and concentration. In the model, distributions of velocity, temperature and concentration are solved with three independent LBGK equations which are combined into a coupled equation through Boussinesq approximation. Influences of Soret number and Dufour number on double diffusive natural convection are analyzed. Streamlines, isotherms, isoconcentrations, average Nusselt and Sherwood numbers around heated cylinder in enclosure are presented. It shows that Soret and Dufour effects have significant influence on double diffusive natural convection.

Key words: enclosure, Soret and Dufour effects, double diffusive natural convection, lattice Boltzmann method

CLC Number:

TK124

WANG Jun, LOU Qin, XU Hongtao, CHEN Jian, YANG Mo. Lattice Boltzmann Simulation of Double Diffusive Natural Convection in an Enclosure with Soret and Dufour Effects[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2018, 35(4): 405-412.

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