飞机外挂物离机过渡过程的有限元算法.

研究飞机外挂物在按给定轨迹下沉旋转的离机过渡过程中，流场非结构网格的调整和再生成方法以及过渡过程欧拉方程有限元数值解法。中指出外挂物运动时流场网格调整或再生成仅需在围绕在外挂物的一小区内进行以减少计算量，而且固定网格的欧拉方程的有限元数值解法也可适用于运动网格情况，只要将固定网格的守恒通量项Fk用运动网格的Ek来代替，并建立了Fk和Ek之间的关系。末给出了带外挂物飞机的实例计算结果。

Finite Element Method for the Transient Processof the Separation of External Stores from Aircraft

The adjustment and the regeneration of the flow field unstructured mesh as well as the finite element solutions for the Euler equations in the transient process of the separation of external stores from an aircraft at a predetermined downward translation and rotation are investigated. It is shown that the adjustment or regeneration of grids needed for moving store can be confined within a small region around the store and the finite element numerical solution method of Euler equations for fixed grids can also be used for moving grids if the conservative fluxes F k of fixed grids are replaced by E k of moving grids. The relation ships between F k and E k are also established. The numerical results for practical examples of aircraft with external stores are shown.