低Reynolds数下单排方柱绕流尾迹涡型的LBM模拟

LBM simulations of wake vortex patterns at low Reynolds numbers behind a row of square cylinders

针对工程中遇到的周期柱体绕流问题,采用格子Boltzmann方法(LBM)对低Reynolds数下单排周期排列方柱的定常绕流进行数值模拟,详细分析了柱体后面的尾迹涡型随着Reynolds数的变化情况,并通过对不同Reynolds数下尾迹涡型结构的分析,得到了二射流、三射流和四射流发生合并现象的临界Reynolds数,其中二射流出现合并的临界Reynolds数与文献的数值模拟结果一致,三射流和四射流出现合并的临界Reynolds数则偏大,但更接近实验结果。

The steady flow at low Reynolds numbers past a single row of square cylinders was studied numerically using the lattice Boltzmann method （LBM） to analyze flows typical of many engineering applications with periodic flows around cylinders. The vortex patterns in the wake agree well with experimental data in the literature with wakes given for several Reynolds numbers. The critical Reynolds numbers were obtained by analyzing the structure of the vortex pattern behind the cylinders to identify when two jets, three jets and four jets join together. The critical Reynolds number for two jets to join is consistent with results in the literature, while those for three and four jets are larger than numerical results in the literature, but closer to experimental reports.