Laminar mixed convection characteristics in a wall driven porous cavity with an isothermally heated square blockage inside have been investigated numerically by the Non-orthogonal multiple-relaxation time lattice Boltzmann method (MRT-LBM). Various directions of wall driven and placement of the blockage have been considered. In the current study, the geometrical and flow parameters being investigated are the directions of wall driven, blockage position (ex, ey), the Richardson number (Ri). From the analysis of the mixed convection process with different directions of wall driven, the results show that under the configuration of central placement of the blockage, the most preferable heat transfer is obtained in the right wall driven at any values of the Richardson number. Because the movement of the wall can lead to an assisting effect on the buoyancy flow in the right wall driven. Since the right wall driven has the best heat transfer effects, the influences of blockage location and Richardson number is investigated in this condition. When the value of the Richardson number is 0.1, the most preferable heat transfer is obtained when the blockage is placed at the top right and bottom right. When the value of the Richardson number is 1.0 or 10.0, both the middle left and middle right blockage placement have the best heat transfer rate. That is mainly due to the influence of the size, strength and position of the vortex, the combined effect of forced convection and natural convection is stronger when the blockage is placed at those locations.

通过非正交多重弛豫时间格子玻尔兹曼方法（MRT-LBM），对壁驱动的多孔腔内的层流混合对流特性进行了数值研究。已经考虑了墙壁驱动的各种方向和障碍物的放置。在当前的研究中，要研究的几何参数和流动参数是壁驱动的方向，阻塞位置（ex，ey），理查森数（Ri）。通过对不同壁驱动方向的混合对流过程的分析，结果表明，在阻塞物居中放置的配置下，在任何理查森数下，右壁驱动的传热效果均最佳。因为壁的运动会导致对右壁驱动的浮力流的辅助作用。由于右驱动壁具有最佳的传热效果，因此在这种情况下研究了堵塞位置和Richardson数的影响。当理查森数的值为0.1时，将阻塞物放置在右上和右下将获得最理想的传热效果。当理查森数的值为1.0或10.0时，左中和右中的阻塞位置都具有最佳的传热速率。这主要是由于涡流的大小，强度和位置的影响，当将阻塞物放置在这些位置时，强制对流和自然对流的组合效果会更强。