网格生长动力学模型的建立和求解及其混合黏性网格生成中的应用

MESH GROWING DYNAMICS MODEL FOR HYBRID VISCOUS MESH GENERATION METHOD FOR COMPLEX GEOMETRY

真实飞行器外形复杂,涉及的流动结构和现象对数值模拟中所需的网格提出了较高的要求。本文首先研究了各向异性黏性网格的生成方法,提出了网格生长动力学模型,并建立了松弛算法求解该模型,从而得到合理的层状网格;提出并建立了各向同性四面体网格的阵面推进Delaunay网格细化算法。最后通过数个算例对所建立的混合黏性网格生成方法的适用性和可靠性进行考察。结果表明,本文建立的混合黏性网格生成方法适用于复杂飞行器的网格生成,具有较高的可靠性。

A real aircraft has a complex geometry,in its simulation,a high quality mesh is required for its structure and the related flow field.In this paper,first we discuss the grid generation method for the anisotropic viscous mesh and propose a grid growing-iteration model,with a relax algorithm to generate a reasonable layered grid.We also propose an advancing front-Delaunay(AF-D)refine algorithm for the isotropic tetrahedron grid.Finally we study a few cases to see algorithm’s feasibility and reliability.The results indicate that the method of the hybrid viscous grid generation for complex geometry is reliable.