基于格子Boltzmann方法的固定方柱绕流研究

Study on the Flow Past Static Square Cylinders Based on the Lattice Boltzmann Method

研究了格子Boltzmann方法的基本原理和边界条件处理方法,并利用该方法对不同雷诺数下固定单方柱绕流流场进行分析,探究了方柱产生卡门涡街的临界雷诺数和范围,验证了格子Boltzmann方法边界处理和数值模拟的正确性和便捷性.对雷诺数为200时并列双方柱不同分布间距的流场进行了模拟,结果表明,当柱间距为2倍方柱边长时,流体绕流方柱的涡流彼此影响最为明显.

The basic principle and the boundary conditions of the lattice Boltzmann method were studied.With this method,the flow field of flow around a single square cylinder at different Reynolds numbers was studied,and the critical Reynolds number and range of the Carmen vortex street produced by the square cylinder were explored,so that the correctness and convenience of the boundary processing and numerical simulation of the lattice Boltzmann method were verified.The flow field of parallel square cylinders with different distribution distances was simulated with Reynolds number at 200.The results showed that the interplay among the vortex around the square cylinder was the most obvious when the cylinder spacing was 2 times the length of the square cylinder.