格子Boltzmann方法在串列双圆柱绕流数值模拟中的应用研究

Application of lattice Boltzmann method in flow past two cylinders in tandem arrangement

基于格子Boltzmann方法,对二维静止串列双圆柱绕流进行了数值模拟,并将模拟结果与已有研究结果进行了对比分析。为提高计算效率和计算精度,采用了多块网格耦合算法,并在圆柱曲边界处采用了较为精确的边界处理方法。提取了圆柱的升阻力系数,讨论了圆柱间距对圆柱受力情况和尾流特征的影响。数值模拟在雷诺数Re=200条件下进行,对两圆柱中心间距为1.5~4.0D(D为圆柱直径)之间的典型间距进行了数值模拟,获得了圆柱升阻力系数以及尾流中涡和流线的变化,验证了临界间距的存在,模拟结果和已有研究结果符合得较好。

The problem of the two-dimensional flow past two cylinders in tandem arrangement is investigat-ed by using lattice Boltzmann method, and the numerical results are compared with the results of other doc-uments. To improve computational efficiency and accuracy, multi-block strategy is developed, and bound-ary treatment method is adopted at the boundaries of cylinders. Besides, the lift and drag coefficients of cylin-ders are extracted, after that the influence of spacing to the wake characteristics and loading conditions is investigated. The simulation is conducted under the condition of Reynolds number Re =200 with typical spacingbetweencylindersfrom1.5？4.0D （D iscylinderdiameter）.Thechangesofcoefficientsofcylinders, vorticity and streamline of wake flow are obtained under the above conditions. And the existence of the criti-cal spacing is verified. The simulation results have good agreements with existing research results.