多体分离非定常气动特性数值模拟

The numerical simulation of unsteady multi-body separating flows

发展建立了用于研究多体分离的非定常流场数值模拟方法,该方法采用网格弹性变形的结构网格动网格技术,采用有限体积法求解ALE(Arbitrary Lagrangian-Eulerian)描述形式的三维非定常Euler方程,与刚体运动方程耦合,数值模拟了子弹穿越母弹头部激波的子母弹分离过程,并与采用攻角修正的准定常计算结果进行了对比分析,表明多数情况下两种数值方法得到的结果比较接近。

Numerical methods using dynamic structured meshes for time-accurately solving unsteady multi-body flow problems involving moving boundaries are implemented. The Godunov finite-volume scheme is presented for solving the 3-D time-dependent Euler equations cast in an Arbitrary Lagrangian-Eulerian （ALE） framework. The processes of submuniton separating from dispenser is simulated by coupling Euler equations and moving equations. The results of unsteady simulation and the results of quasi-steady simulation show the quasi-steady numerical methods are also efficient in most situations.