Simulation of the reconstruction of the boundary layer by moving cylinders

摘要

In this paper, the reconstruction of the boundary layer of the fluid in the channel is studied by lattice Boltzmann method (LBM). By comparing the distribution of velocity in the channel, the conclusion that LBM has the feasibility and superiority in dealing with moving boundary is obtained. Based on this, physical model of moving square cylinders with different height are set up to simulate the effect on the thickness of boundary layer, and the results indicate that the thickness of the boundary layer decreases with the cylinders' height increasing in the given range. Furthermore, double cylinders model is also set up, and the results show that the optimal interval distance of the cylinders is between 90 and 140 lattice unit. It is found that the moving cylinders have significant effect on the thickness of the boundary layer, which will change the fluid flow and enhance the heat transfer.