二维带动力吸气式高超声速飞行器绕流的PNS-NS混合求解

对于数值模拟高超声速飞行器带动力整机流动，采用单纯的时间迭代方法非常耗时。本文结合空间推进求解PNS方程和时间迭代求解NS方程的CFD方法来模拟高超声速飞行器整机流动。高超声速飞行器的流场是超声速占主导的，但在流场中也存在局部分离以及亚声速占主导的区域。本文采用的CFD方法，在超声速占主导的流动区域采用空间推进求解PNS方程的方法，在亚声速和分离区采用时间迭代求解NS方程的方法，整机流动在划分的各个区域之间自动推进求解。对于求解带动力高超声速二维整机流动，目前的CFD方法在大大节约计算时间和计算资源的同时，可以得到和完全时间迭代方法同等准确的数值模拟结果。

PNS-NS Combined Simulation of Powered 2D Air-breathing Hypersonic Vehicle

For numerical simulation powered whole air-breathing hypersonic vehicle flow field, it is very time consuming when uses traditional NS time iteration CFD methods. Present paper using a combined PNS space marching and NS time iteration procedure simulate powered whole vehicle flow field. Most of vehicle flow filed is supersonic dominated. But there still have large subsonic or stream direction separation regions. According present combined space marching and time iteration CFD method, in the supersonic dominated region space marching method is used to solve the PNS equations and in the stream direction separation or subsonic dominated regions, time iteration method is used to solve the NS equations. The entire flow field is solved by CFD software marching through regions by regions automatically. For solving the whole vehicle flow field, present combined CFD procedure can get results with the same level of accuracy comparing with traditional time iteration methods and saving computational time dramatically with decreasing consuming computational resources.