均匀流场中串列双圆柱水动力特性的数值实验研究

Numerical research on hydrodynamic characteristics of two circular cylinders in tandem arrangement across flow

采用计算流体软件CFX-5中Large-eddy simulation(LES)模型计算了二维不可压缩均匀流中孤立圆柱及串列双圆柱的水动力特性.使用非结构化网格六面体单元和有限体积法对二维N-S方程进行求解.数值实验着重研究了高雷诺数时串列双圆柱在不同间距比时的压力分布、阻力、升力及St数随Re数的变化趋势.稳态力及St数的数值计算结果与实验结果吻合较好.

The hydrodynamic characteristics of two circular cylinders in tandem arrangement in a two-dimensional incompressible uniform cross flow were calculated using the large-eddy simulation （LES） method. Solutions to the two-dimensional Navier-Stokes equations were obtained using finite volume method and an unstructured mesh arrangement with hexahedral elements. The focus of this research was to study pressure distribution （drag and lift forces） variations of the number with Reynolds numbers at different spacing （L/D= 3, 4, 5）. The calculated steady forces and number were in accordance with the experimental results.