圆柱绕流。圆柱表面采用FH格式，均匀速度入口、自由出流、上下壁面非平衡态外推格式。让自由出流边界格点的密度也等于临近一层的。

-Flow around a circular cylinder. Cylindrical surface using FH format, uniform speed entrance, free flow, upper and lower wall non-equilibrium extrapolation scheme. Let free flow lattice point density is equal to the adjacent layer.