物体穿越激波非定常流场的统一分区加强解

Unified Zonal Fortified Solutions for the Unsteady Flow Fields Induced by a Body Overtaking Shock Waves

用数值方法求解非定常可压缩Navier Stokes方程,模拟了物体以超音速穿越与之同向运动激波及逆向运动激波的全过程.为确保数值模拟中的激波和物体的相对运动有足够的网格分辨率,使用了统一分区加强解算法,详细给出了追击穿越和碰撞穿越的流场结构和气动力,并且通过和单区结果的对比,说明统一分区加强解算法是一种处理复杂几何外形和提高网格分辨率的简单有效方法.

Numerical simulations of the flow field around a double\|wedge shaped projectile overtaking shocks, which move in two different directions, are carried out by solving unsteady compressible Navier\|Stokes equations. In order to have enough grid resolution, the unified zonal fortified solution algorithm is used. Two test cases, the pursuing overtaking and the colliding overtaking are considered and discussed. The complex structure of wave systems and the aerodynamic forces are discussed. By comparing with the results acquired with the original methods, it is shown that the developed unified zonal method can be an effective and simple tool for handling complex bodies and enhancing the accuracy of numerical simulation.