平面斜激波固壁反射的镶嵌网格解法

ADAPTIVE GRID EMBEDDING FOR REFLECTION OFOBLIQUE SHOCK WAVE ON SOLID WALL

镶嵌网格法是自适应网格法的一种。本文提出的镶嵌网格法以Ｎｉ的二阶有限体积法为基础，用密度一阶差分作为察觉激波的特征参数，给出网格局部加密（一分为四）的原则，构造了较节省存贮的数据结构。用于平面斜激波固壁反射的计算结果表明：镶嵌网格对激波的分辨能力不仅比粗网格强得多，而且也稍好于细网格；计算时间仅为细网格的一半稍多些．可见，此方法对解决计算效率和精度的矛盾是有利的。

Embedding grid is one of adaptive grids. The study makes the Ni's second-order method of finite volume as a base, adopts first-order difference of density as the characteristics Parameter of detecting shock wave, Presents the principles of local fining grids (one divedes into four )and establishes the daal structure of fewer memory. The computational results for solid wall refleCtion of planar oblique shock wave show that the resulotion of shock wave of embedding grid not only appears to be much better than coarse grid, but also slight better than fine grid, and CPU time is slight higher than half of fine grid. Therefore this method facilitates solving of contradiction between computational effeciency and accuracy.