为了控制后向台阶分离流动的再附过程，采用雷诺平均N-S方程（RANS）方法和延迟分离涡模拟（DDES）方法对剪切层上方布置了微小圆柱的后向台阶进行数值模拟研究，分析了离体微小圆柱对流动再附位置的影响及其控制分离流动再附过程的内在机理。数值模拟结果表明：圆柱的布置位置和直径对分离流动再附过程有明显的影响，当圆柱布置在剪切层上方特定位置时会使再附位置提前，布置在剪切层内部核心区则会导致再附位置靠后；随着圆柱直径增大，台阶下游分离区长度先减小后增大。

In order to control the separation flow and reattachment of the backwardfacing step (BFS), the ReynoldsAveraged NavierStokes equations (RANS) and the delayed detached eddy simulation (DDES) methods were used to numerically simulate the BFS with a micro cylinder arranged above the shear layer, and analyze the influence of detached micro cylinder on flow reattachment position and its intrinsic mechanism for controlling the reattachment process of the seperation flow. The numerical simulation results show that the position and diameter of the micro cylinder have an obvious influence on the reattachment process of the separation flow. When the cylinder is placed at a specific position above the shear layer, the reattachment position will be advanced. When the cylinder is placed in the core region inside the shear layer, the reattachment position will be backward. With the increase of cylinder diameter, the length of the downstream separation zone of the step decreases first and then increases.

O357.5

上海理工大学学位点引导布局与建设培育项目(XWDA2021104)