一种基于Delaunay背景图改进的网格变形方法  

Improved mesh deformation method based on Delaunay background map

作　　者：蒋波[1,2] 朱目成 曾磊[2] 刘深深[2] 刘骁 Jiang Bo;Zhu Mucheng;Zeng Lei;Liu Shenshen;Liu Xiao(College of Manufacturing Science&Engineering,Southwest University of Science&Technology,Mianyang Sichuan 621010,China;Computational Aerodynamics Institute,China Aerodynamics Research&Development Center,Mianyang Sichuan 621000,China)

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010 [2]中国空气动力研究与发展中心计算空气动力研究所,四川绵阳621000

出　　处：《计算机应用研究》2018年第4期1088-1091,共4页Application Research of Computers

基　　金：国家科技工程基金资助项目(91216204)

摘　　要：针对Delaunay网格变形方法中因计算网格点在背景网格中映射不够精细导致的大变形失效问题,提出了一种改进后的网格变形方法,旨在进一步提高大变形情形时变形后的网格质量。该方法将原始的Delaunay网格变形方法中的背景网格远场边界进行加密,增加了映射背景网格单元的数量,改善了计算网格在背景网格中的映射精细程度,从而提升了变形后网格的质量。通过一正方形网格变形基础算例和30P30N三段翼型流场网格变形算例分别进行了测试与验证,结果表明该改进方法可以在保证计算效率的前提下,显著提升大变形时变形后的网格质量。与原始的Delaunay网格变形方法相比较,改进后的网格变形方法变形能力较强,所生成的网格质量较高。This paper proposed an improved mesh deformation method based on Delaunay background map to increase the mesh quality after large deformation,which could be efficient to avoid failure due to bad mapping of the computational grid points to the Delaunay background mesh.Setting up much more far field boundary points than the original Delaunay deformation method make the number of mapping units in the background mesh increase,and the mapping accuracy for computational grid in the background mesh improve.Then,the quality of the grid after deformation became much better.Finally,it tested and verified the method separately through a deformation square grid case and 30P30N airfoil model case,the results indicate that the improved method can significantly increase the mesh quality after large deformation while ensuring the computational efficiency.Compared with the original method,the improved method can keep better ability of deformation and mesh quality.

关 键 词：动网格 网格变形 Delaunay图映射 边界加密 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]