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首页> 外文会议>2011 International Conference on Electric Information and Control Engineering >Research on numerical method of air flow around the high-speed train under crosswind using tetrahedron unstructured mesh
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Research on numerical method of air flow around the high-speed train under crosswind using tetrahedron unstructured mesh

机译：基于四面体非结构网格的侧风下高速列车绕流的数值计算研究。

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Because of the ability to reveal the characteristics of fluid flow in detail, the numerical simulation method becomes more important in designing high-speed train parts with better aerodynamic performance, such as nose shape, lower-drag body and so on. Using a CFD code based on the finite volume method, the present study carried out numerical simulation of air flow around ICE2 high-speed train under crosswind. The SIMPLE algorism was used in solution of N-S equations of three dimensional, steady state and incompressible flow of fluid which possesses constant physical properties. Tetrahedron unstructured mesh was generated using ICEM CFD software. Comparison study of present work with a classical experimental research performed by overseas scholars shows that the results of solution method using QSKE turbulence model and MARS scheme is reliable. Thereafter, the grid independence research was performed in two ways, one is to fix the height of the first layer cells around the body but change the overall number of cells, and the other is to fix the overall number of cells but change the height of the first layer cells around the body. It is shown that the mesh with both the proper number of cells and the height of the first layer can produce better simulation results. The conclusion of present study could be used in further numerical study of high-speed train with rather complicated geometry.
机译：由于能够详细揭示流体的流动特性，因此数值模拟方法在设计具有更好空气动力学性能的高速火车零件（如机头形状，下拖曳车身等）时变得尤为重要。使用基于有限体积法的CFD代码，在侧风作用下，对ICE2高速列车周围的气流进行了数值模拟。 SIMPLE算法用于求解具有恒定物理特性的三维，稳态和不可压缩流体流动的N-S方程。使用ICEM CFD软件生成四面体非结构化网格。通过对当前工作与国外学者进行的经典实验研究的比较研究表明，采用QSKE湍流模型和MARS方案求解方法的结果是可靠的。此后，通过两种方式进行了网格独立性研究，一种是固定围绕身体的第一层细胞的高度，但改变细胞的总数，另一种是固定细胞的总数，但改变细胞的高度。身体周围的第一层细胞。结果表明，具有适当数量的像元和第一层高度的网格可以产生更好的模拟结果。本研究的结论可用于几何较为复杂的高速列车的进一步数值研究。

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