文中通过耦合高精度加权本质无振荡格式和LevelSet方法,实现了固体火箭发动机点火阶段运动激波与动态裂纹相互作用的数值模拟。考虑到移动网格技术在处理复杂界面以及界面拓扑变形时的困难,利用LevelSet方法对不断推移的裂纹界面进行追踪,实现了运动激波同裂纹移动边界的耦合计算。计算得到了激波绕射裂纹的流场图谱,清晰的分辨出了激波在裂纹中的传播过程,并分析了激波在裂纹中传播引起压力振荡的机理。通过动态边界条件和静态边界条件计算结果的对比,探讨了引入移动边界计算的必要性。

Numerical simulations of moving shock wave diffraction over a propellant crack during rocket ignition carried out by using the weighted essentially non-oscillatory (WENO) scheme combing with the Level Set method. Considering the difficulties of the dynamic meshes in dealing with topology change of the complicated surface, the Level Set method employed to track the evolving surface of the grain crack to couple the moving boundaries of the crack with ignition pressurization. A set of changing flow field obtained, in which the evolution process of the shock waves can be clearly observed. The mechanism of shock wave diffraction over a crack analyzed. The necessity of the dynamic boundary conditionss discussed by comparing the difference between the results obtained from static and dynamic boundary conditions.