三维方管中柱体可压绕流的大涡模拟

Large Eddy Simulation of 3-D Square Channel Flow Around Wall-mounted Rectangle Cylinder

该文利用大涡模拟,对可压缩流体绕经安装在方管底部的长方体和矩形体的绕流现象进行了三维数值模拟。模拟结果显示了流体绕经障碍物后各涡的形成和耗散过程。分析了不同Re时柱体绕流流场的结构。发现长方体壁面上的各个涡在小雷诺数时基本稳定,在大雷诺数时涡容易脱落,流场呈现复杂的湍流结构。通过改变柱体障碍物的高度,得到了绕流流场在不同阻塞比下的结构变化,发现湍流现象随着阻塞比的增大而增强。

The large eddy simulation is applied to simulate a 3-D square channel compressible flow around a wall-mounted rectangle cylinder. The calculated results show the formation and the diffusion of eddies around the cylinder. This paper analyzes the construction of flow field with the different Reynolds numbers. It can be found that the eddies on the wall of cylinder are stable in the situation of small Reynolds number and shed easily in the situation of large Reynolds number. The variational construction of flow field is obtained in the different blockage ratios by adjusting the height of the rectangle cylinder. The turbulence is enhanced by increasing blockage ratio.