Fast Dynamic Mesh Moving Based on Background Grid Morphing

摘要

The dynamic mesh moving method based on Delaunay graph is non-iterative and therefore efficient. However, intersections occur occasionally among the background graph elements for complex geometries with large relative movements, especially for the large boundary rotations. It not only consumes more time but also deteriorates mesh quality to regenerate the graph and to relocate mesh points. In this work, a dynamic mesh generation method based on background grid morphing is proposed. By appending some assistant points in the initial graph, a new background graph in conjunction with a new mapping is generated. Then, the ball-vertex method with boundary improvement is employed to move the new graph which drives the moving of the object mesh. The examples demonstrate that the improved method have better ability of keeping the shape for the regions concerned and can improve the intersection problems even with large boundary rotations. In general, the method proposed shows better performance in mesh quality and efficiency.