一种基于新型动态混合重叠网格的数值模拟方法

A Numerical Simulation Method Based on the New Dynamic Mixing Overlapping Grid

外挂导弹发射时导弹处于载机复杂干扰流场中,会导致空气动力的非定常、非线性特性。此时运用常规风洞实验数据插值作为工程气动数据基础在一定程度上存在误差。本文提出一种基于计算流体力学(CFD)的非定常数值模拟方法,将飞行力学方程与空气动力学方程耦合求解,更精确地模拟真实的飞行状态。所采用的新型动态混合重叠网格相比于以往重叠网格具有生成简便、针对运动过程可自适应调整等优点。以标准投弹算例作为验证算例,结果体现了本文网格和数值模拟方法的工程应用价值。

During launching of the external-carried missile,the missile is in a complex flow field of airborne,which will cause the unsteady and nonlinear characteristics of aerodynamic. At this time,using common method of wind tunnel test data interpolation as the aerodynamic data base will create error to a certain extent. An unsteady numerical simulation method based on the computational fluid dynamics（ CFD） is proposed,and the flight mechanics equations and aerodynamic equations are coupled and solved,so as to simulate the real flight status more accurately. Compared with the past overlapping grids,the used new dynamic mixing overlapping grid has advantages such as easy generation,selfadapting adjustment for moving process. Taking the standard bomb-dropping example as a verification example,the results indicate the engineering importance of the dynamic mixing overlapping grid and the numerical simulation method.