LRR雷诺应力模型在圆柱体底部流场计算中的应用

Application of LRR Reynolds Stress Model to Numerical Simulation of Base Flow Field for a Cylindrical Model

采用三维RANS方程结合LRR雷诺应力模型对圆柱体底部流动特性进行了模拟,研究了来流马赫数为2. 46条件下无喷流和有喷流两种情况的底部流场,分析了底部压力分布、轴向流动速度分布、流场结构等。结果表明,在无喷流和小喷流条件下,LRR雷诺应力模型预测能较好预测再附点位置和底部压力等参数。所得结果与已有的实验和计算结果非常接近,表明LRR雷诺应力模型能够较好地模拟圆柱体底部流动。

The characteristics of base flow for a cylindrical model in supersonic flow were simulated with 3-D RANS equations and LRR Reynolds Stress Model （RSM）. The base flow-fields of the model in a free-stream of Mach 2. 46 with and without base bleed flow results were investigated, and base pressure distribution, axial velocity distribution and flow field structure were analyzed. It is shown that the pa- rameters such as reattachment location and base pressure are predicted well with the LRR RSM for the low injection bleed and without bleed cases. The results are agreed well with other researcher＇ s experimental data and numerical results, which shows that the LRR RSM gives a good performance for simulation of base flow.