lid driven cavity solver mrt lbm

基于多松弛因子的LB方法，运用C++编写方腔顶盖驱动流，计算方腔内流体的流场(Based on the LB method with multiple relaxation factors, the flow field of the square cavity top cover is written by C++, and the flow field of the fluid in the square cavity is calculated)

MRT LBM计算Lid driven cavity(multi relaxation time lattice boltzmann method for lid driven cavity test)

运用多松弛时间，相对于单松弛，具有更好的稳定性，且数值结果更精确(Compared with single relaxation, multi-relaxation time is more stable and the numerical results are more accurate.)