等边布置三圆柱绕流的数值分析

Numerical Simulation of Three Equispaced Circular Cylinders

用有限元方法对于等边三角形布置的三个相同直径的二维圆柱绕流问题进行了数值模拟 ,分别求得了在不同间距比下的流场分布和各圆柱的升、阻力系数以及斯托哈罗数。计算结果表明 ,小间距比情形下三圆柱之间的干扰是严重的 ,流动并不对称于中心轴线 ,而是偏向下游的某个圆柱。数值计算结果与有关文献和实验进行了对比 。

In this paper, the flow interference among three circu la r cylinders with different equilateral-triangular arrangements is calculated by the finite element method (FEM). The lift and drag coefficient, and St number a re resolved at different spacing ratios. The results show that the interference is serious when the cylinders are closely. When the spacing ratio is smaller tha n a certain value, the gap flow is biased to one side of certain downstream cyli nders. Some areas of the cylinder surface may be suffered very strong negative p ressure in downstream. The calculation results are compared with other experimen tal data, and the agreement can be satisfied.