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复杂外形粘性流动的计算网格生成一直是阻碍CFD实际工程应用的瓶颈问题之一,虽然三棱柱/四面体混合网格的出现极大地缓解了这一问题,但是在飞行器几何外形非常复杂的情况下,在粘性边界层内生成高质量的贴体三棱柱网格仍然是非常困难的事情。本文从“各向异性”四面体网格的生成算法中得到启示,发展了一种基于“各向异性”四面体网格聚合的混合网格生成方法。通过对DLR-F6翼身组合体和F16战斗机外形的混合网格生成及数值模拟表明,该方法生成的混合网格具有网格质量好、自动化程度高等特点,对提高复杂外形飞行器关键气动参数的模拟精度具有重要意义。
Complicated shape viscous flow of computational grid generation has been one of the bottlenecks impeding the practical application of CFD. Although the appearance of the triangular prism / tetrahedron hybrid grid greatly ameliorates this problem, in the case of complex geometry of the aircraft , It is still very difficult to generate high-quality solid triangular prismatic grids in the viscous boundary layer. In this paper, we get enlightenment from the generation algorithm of “anisotropic ” tetrahedral mesh and develop a hybrid mesh generation method based on “anisotropic ” tetrahedral mesh aggregation. Through the hybrid mesh generation and numerical simulation of DLR-F6 wing-body combination and F16 fighter shape, it shows that the hybrid mesh generated by this method has the characteristics of good mesh quality and high degree of automation. It is very important to improve the key aerodynamic parameters of complex profile aircraft Simulation accuracy is of great significance.