二维带动力吸气式高超声速飞行器绕流的PNS-NS混合求解

为了提高吸气式高超声速飞行器绕流的求解效率,采用空间推进求解抛物化PNS(parabolizedNavier-Stokes)方程和时间迭代求解Navier-Stokes(N-S)方程的混合计算流体动力学(CFD)方法来求解高超声速飞行器整机绕流.在超声速占主导的流动区域采用空间推进求解抛物化N-S方程的方法,在亚声速和分离区采用时间迭代求解N-S方程的方法.对于求解二维带化学反应的吸气式高超声速飞行器绕流,混合CFD方法和完全时间迭代方法相比,可得到同等准确的数值模拟结果,并且求解效率提高了数倍. 

PNS-NS combined method for solving two-dimensional powered airbreathing hypersonic vehicle's flowfield

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.