关键词: 高速列车；数值模拟；结构化六面体网格；非结构化四面体网格；网格融合

Abstract:

In numerical simulation of turbulent flow around a highspeed train passing through a tunnel, in order to get more physically accurate results, detailed local compositions such as bogies, pantograph cover and windshield have to be considered, thus the model becomes increasingly complicated. The multiblock mesh generation and mesh fusion method are adopted to obtain a computational grid with high quality and applicability. Unstructured tetrahedral meshes are generated around the highspeed train, and structured hexahedral meshes are generated in the moving zone and the rest of solution domain. On the interfaces, the triangular and quadrangular surface meshes of two blocks are fused by controlling the change of node positions, which makes the topology consistent and the grids connected. The subsequent simulation results of the computational grids are compared with those of one dimensional characteristics method, which shows that the presented method can provide less grids points and higher generation rate under the same accuracy requirement. The method can be further used in similar studies.

Key words: high-speed train;numerical simulation;structured hexahedral mesh;unstructured tetrahedral mesh;grid fusion