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本文主要介绍三维理想气体钝体流计算中一个行之有效的方法,即非定常差分方法。它的主要思想是内点用二阶精度的Lax-Wendroff格式,边界点用特征概念。使用结果表明,方法的特点是:适用范围比较广,对较大范围的攻角与M数,对较复杂的物形都能给出精度较好的结果。同时它所需的计算时间并不比同类型方法来得多。文后给出部分计算结果,对有些钝双锥物体,在较小的M数情况下,发现流场中存在一个形状不同的M数很接近于1的区域。
In this paper, we mainly introduce an effective method for the calculation of bluff body fluid flow in three-dimensional ideal gas, which is unsteady difference method. Its main idea is the Lax-Wendroff format with the second-order precision of interior points and the concept of the boundary points. The results show that the method is characterized by a wide range of applications, a better accuracy for more complex shapes with respect to a wide range of angles of attack and M numbers. At the same time it does not require much computation time than the same type of method. Some results are given. For some obtuse biconvex objects, with a small number of M-numbers, it is found that there exists a region in the flow with a different number of M-numbers close to one.