预处理方法求解低马赫数流场的边界条件

摘要

The influences of three common boundary conditions at low speed entrance on stability and convergence are present by solving 2-D compressible Euler equations that have been preconditioned. The test shows that by preconditioning the boundary condition based on the Riemann invariants at low Mach numbers is reflective boundary condition while the other two are unreflective boundary conditions.%通过求解预处理后的二维可压缩Euler方程，数值试验了常见的三种进口边界条件的提法及其对稳定性和收敛性的影响。数值试验结果表明，预处理后，在低马赫数时基于黎曼不变量的边界条件为反射边界条件，而另两种边界条件为无反射边界条件。