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针对结构嵌套网格计算,提出一种实用的初始洞面构造方法,成功应用于自动化嵌套网格生成过程。首先采用封闭物面作为嵌套网格“挖洞”的初始洞边界,然后通过分别给定期望的壁面距离及初始洞间距比例因子的方法进行优化,得到真正的挖洞曲面。通过对NACA4412单段翼型、30P30N三段高升力翼型等算例计算,结果表明:本文提出的方法能有效解决嵌套网格计算中初始洞边界自动构造问题,并能有效避免在近壁面区域进行流场传值,在不需要额外采用洞面优化技术的情况下解决壁面狭缝网格重叠问题,获得更优的嵌套网格流场计算结果。结合本文方法对传统嵌套网格方法进行改进,可为自动化嵌套网格生成提供有效的途径。
Aiming at the nested grid computing of structures, a practical method of constructing initial caverns is proposed, which is successfully applied to the process of automated nested grid generation. Firstly, the closure surface is used as the initial hole boundary of the nested grid “digging hole”, and then the real tunneling surface is obtained by optimizing the ratio of the initial wall spacing and the desired wall distance respectively. The results show that the method proposed in this paper can effectively solve the problem of the initial construction of the initial hole boundary in nested grid calculation and can effectively avoid the problems of near wall The flow field value is used to solve the problem of the overlap of wall slot mesh without using additional hole optimization technology to obtain better nested mesh flow field calculation results. The improvement of the traditional nested grid method combined with this method can provide an effective way for the automated nested grid generation.