A meshless geometric multigrid method for a grid with a high aspect ratio

被引：0
作者：
Sang Truong Ha
Hyoung Gwon Choi
Seong Ju Do
Han Young Yoon
机构：
[1] Le Quy Don Technical University,Dept. of Mechanical Engineering
[2] Seoul National University of Science and Technology,Dept. of Mechanical and Automotive Engineering
[3] Korea Atomic Energy Research Institute,undefined
来源：
Journal of Mechanical Science and Technology | 2022年 / 36卷
关键词：
CUPUD; High aspect ratio; Hybrid grid; Meshless geometric multigrid; Semi-coarsening; Unstructured grid;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In this paper, a new semi-coarsening method is proposed by extending the meshless geometric multigrid method based on full-coarsening for an anisotropic unstructured mesh. The present semi-coarsening method is based on the distance weighting for a finite volume grid and validated by solving the pressure equation of CUPID, which is a CFD code with an unstructured grid. Although the present semi-coarsening method requires more coarsening steps than the full-coarsening method to build the coarsest grid, the numbers of V-cycles required to the convergence are nearly the same for the two methods. Therefore, the proposed semi-coarsening method is found to perform much better than the conventional full-coarsening method when an unstructured grid with a high aspect ratio is involved in the V-cycle multi-grid computation. Furthermore, the present method works well with a hybrid mesh, where brick elements with high aspect ratios near the wall boundary are coupled with isotropic tetrahedrons.
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页码：5551 / 5559
页数：8
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