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Non-orthogonal Multiple-Relaxation-Time Lattice Boltzmann Simulation of mixed convection in porous cavity with an isothermally heated block
Author(s): ying zhang, Jin Bao, Mengjun Yao, Yuxian Xie, Yichen Huang, peisheng li
Keywords: Lattice Boltzmann method,Mixed convection, Lid-driven cavity, Porous media,isothermally heated block
Laminar mixed convection in porous cavity with an isothermally heated block has been investigated numerically by using the Non-orthogonal multiple-relaxation time lattice Boltzmann method (MRT-LBM). The effects of six different cold source arrangements on the characteristics of fluid flow and heat transfer in the porous cavity have been studied. The top and bottom walls of the cavity maintaining constant cold temperature, the effects of four different lid directions are studied. The results show that both cold sources and lid directions have great impacts on fluid flow and heat transfer. It is found that different cold source arrangements produce different numbers of vortices with the Richardson number increases. As for Top-Left,Top-Right and Top-Bottom arrangements, these three arrangements always show high heat teansfer level. Additionally, the case of both top and bottom walls moving right displays best heat transfer characteristic than other three cases when Ri≤1,and the case of top and bottom walls moves in the opposite directions has best heat transfer performance than other three cases when Ri>1.