高雷诺数下单圆柱绕流的DES三维数值模拟

3Dnumerical simulation of flow over a circular cylinder at high Reynolds numbers using DES method

采用Spalart-Allmaras基的DES模型对不同雷诺数下单圆柱绕流的湍流流场进行了三维数值模拟,取雷诺数Re=2×104,1×105,3×105和1×106,数值模拟研究分析了流场形态,给出了阻力系数及升阻力频谱,并与前人的实验和其他方法模拟的结果进行了对比.结果显示,它们与实验数据一致且图形的三维特性明显,这也验证了DES方法在高雷诺数时在圆柱绕流模拟方面的准确性.

Three-dimensional flow over a circular cylinder was numerically simulated using the DES method based on the Spalart-Allmaras turbulence model.The computational simulations were performed for four different Reynolds numbers Re=2×104,1×105,3×105 and 1×106.The numerical simulation focused on investigating the flow patterns,the time histories drag coefficients,and the spectrum of lift and drag coefficients.Compared with experimental data and results obtained from other methods,the results show that they have a good agreement with the experimental results and show vivid 3Dcharacters.Moreover,all these verify the calculation accuracy of the DES method for flow over cylinders at high Reynolds numbers.