用CSCM格式模拟二维收缩管道内的流动

 采用Lombard等人提出的CSCM(Conservative Supra-Characteristics Method)差分方法数值模拟二维收缩管道内波系干扰及激波边界层干扰等问题。所得结果同已往计算结果进行了比较。通过压力场和速度场的计算结果可看到Ma数对流场的影响。在Ma数较小时激波角较大,可看到激波经两次相交一次反射逐渐变弱的情况。Re数改变对流场也有明显影响,且给出由于激波干扰引起边界层分离的计算结果。最后还给出收缩管道内激波由正激波逐步形成斜激波的非定常过程。

NUMERICAL SIMULATION OF THE INLET FLOW WITH CSCM

The viscous laminar flow in the inlet is simulated by solving compressible Navier-Stokes equation. The partial differential equations are approximated by CSCM (Conservative Supra - Characteristics Method). The problems of the interaction among the shock wave systems and the interaction between shock and boundary layer in the inlet are researched. The computed results are compared with experiment results. The influences of Mach number in the flow can be seen in the computed results. The smaller Mach number is, the larger the shock angle in the inlet. The shock waves become weak with twice intersections and one reflection. The Reynold number also influences the flow in the inlet. The results of separation in boundary layer due to the interaction between shock and boundarv are obtained.