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在高速列车过隧道问题的数值模拟中,为提高模拟准确性而考虑转向架、受电弓导流罩、车厢连接处等细部结构后,几何模型变得复杂。为了得到质量高、适用性强的计算网格,在列车附近生成非结构化四面体网格,运动网格及计算区域其余部分划分块结构化六面体网格。在融合面上,利用网格融合技术处理四面体网格的三角形面网格和六面体网格的四边形面网格的联结问题,通过控制节点位置的变化满足拓扑一致,实现无缝连接。通过三维数值模拟计算结果与一维实验结果的对比发现,在同等精度要求下,采用网格融合技术及分区思想生成的网格整体上数量更少,生成速率更高,该方法可推广应用于更复杂几何模型的网格划分中。
In the numerical simulation of high-speed train passing through a tunnel, the geometric model becomes complicated after considering the detailed structure such as the bogie, pantograph shroud and carriage connection in order to improve the simulation accuracy. In order to obtain high-quality and adaptable computing grids, an unstructured tetrahedral grid is generated near the train, and the moving grids and the rest of the computing area are divided into block structured hexahedral grids. In the fusion surface, the mesh fusion technique is used to deal with the connection problem of the tetrahedral mesh of the tetrahedron mesh and the tetrahedral mesh of the tetrahedron mesh, and the topological consistency is satisfied by controlling the change of the position of the nodes to achieve seamless connection. Comparing the 3D numerical simulation results with the one-dimensional experimental results, it is found that the grids generated by the grid fusion technology and zoning thought are fewer in number and higher in generation rate under the same precision requirements. This method can be widely applied to Mesh in more complex geometric models.