用Lattice Boltzmann方法模拟方柱绕流

用Lattice Boltzmann方法模拟了两种情况下的方柱绕流：方柱位于流场的边壁和方柱位于流场的中央。在第1情况中，分析了流场的流线、速度矢量分布以及方柱后面绕流形成的回流区长度随Reynolds数的变化曲线；在第2种情况中，除了给出稳定时流场的流线、速度矢量分布和压力分布以外，还模拟了Re＝150时方柱后面形成的周期旋涡现象。两种情况下的计算结果与其他文献中的计算数值和试验数据是一致的。

Simulation of flow fields around a square cylinder with Lattice Boltzmann Method

The flow field around a square cylinder in two cases was simulated with the Lattice Boltzmann Method (LBM). In case 1, with the square cylinder located at a wall of the flow field, the streamline and velocity distribution of the flow field and the variation of the length of the reattachment region behind the square cylinder with the Reynolds number were analyzed. In case 2, with the square cylinder located at the center of the flow field, besides the streamline, velocity distribution, and pressure contour of the steady flow, the unsteady vortex shedding behind the square cylinder at Re=150 was also simulated. Results in both cases are in good agreement with the data from other literature and experiments.