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使用基于SA(Spalart-Allmaras)湍流模型的分离涡模拟(DES,Detached-Eddy Simulation)方法,对圆柱绕流和超声速圆柱底部流动等高雷诺数大分离流动进行了数值模拟.无粘通量的计算采用二阶迎风格式,时间推进使用二阶隐式双时间步法.计算表明相对于雷诺平均N-S方程(RANS,Reynolds-Averaged Navier-Stokes)模拟,时空均为二阶精度的DES模拟能够分辨更为精细的分离区三维旋涡结构,对分离区主要湍流结构的捕捉和平均压力分布的预测取得了满意的结果.
Numerical simulation of the high Reynolds number large separation flow around the cylindrical flow and the supersonic cylindrical bottom was carried out using the Spatial-Eddy Simulation (DES) method based on SA (Spalart-Allmaras) turbulence model. The second-order upwind method is used in the calculation, and the second-order implicit two-time method is used in the time advancement. The calculation shows that the DES simulation with second-order precision can distinguish the Reynolds-Averaged Navier-Stokes The finer three-dimensional vortex structure in the separation zone has obtained satisfactory results for the capture of the main turbulent structure in the separation zone and the prediction of the average pressure distribution.