高雷诺数下并列双圆柱绕流的DES法三维数值模拟

Three-dimensional numerical simulation of flow around two side-by-side circular cylinders at high Reynolds numbers using DES method

该文采用基于S-A的DES方法对雷诺数为104且不同间距比下并列双圆柱的湍流模型进行了三维数值模拟,取间距比T/D为1.1、1.5、2.0、3.0和4.0(T为两圆柱中心之间的距离,D为圆柱直径)。数值模拟研究了流场形态,升阻力系数及升力频谱,发现了不同间距比下的各种紊流形态及流体动力情况,它们与实验结果一致且显示了明显的三维特性,同时这也验证了DES方法在高雷诺数柱群数值模拟方面的准确性。

In this paper, Three-dimensional flow over two side-by-side circular cylinders is numerically simulated using DES method based on Spalart-Allmaras turbulence model for varied spacing ratios at Re = 10000. The computational simulations were performed for five different spacing ratios T/D = 1.1, 1.5, 2.0, 3.0 and 4.0 （T is the transverse distance between the centers of two circular cylinders, D is the diameter of the circular cylinders）. The numerical simulation focuses on investigating the flow patterns, the time histories of lift and drag coefficients, and the spectrum of lift coefficients. The results show various turbulent wake patterns and hydrodynamic forces for varied spacing ratios. They have a good agreement with experimental results and show vivid 3D characters. Moreover, all these verify the calculation accuracy of DES method for cylinder groups at high Reynolds numbers.