关键词: 重叠网格, 隐式装配, 并行, 自动化, 壁面距离, 集合论

Abstract: Overset grid assembly is one of the key technologies dealing with multi-body motion in the field of computational fluid dynamics. Existing implicit assembly methods usually have problems of complicated geometric analysis and low assembly efficiency caused by the search operation among all nodes. To address these issues, a highly automated overset grid implicit assembly method is proposed. First, based on fast algorithms such as the covariance analysis and box cutting, the calculation of wall distance is decoupled from the existence judgment of contribution units, realizing automatic identification of the dynamic overset relationship of grid groups. Secondly, combined with the set analysis, a parallel automatic digging algorithm is designed. Finally, a quick query method is used to establish the interpolation relationship between overset cells and denoting cells. In view of the implemented parallel overset grid implicit assembly library, a five-sphere component is used to verify the accuracy of the automatic digging scheme, and the accuracy of the interpolation relationship between the overset cells and denoting cells is also verified by the Wing-Pylon-Finned Store(WPFS) model.

Key words: overset grids, implicit assembly, parallel, automatic, wall distance, set theory