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首页> 外文会议>第一届现代铁路创新与可持续发展国际会议（The First International Symposium on Innovation amp; Sustainability of Modern Railway） >AN INVESTIGATION ON NUMERICAL SIMULATION OF FLOW OVER CROSS-SECTION OF TRAIN UNDER CROSSWIND CONDITION
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AN INVESTIGATION ON NUMERICAL SIMULATION OF FLOW OVER CROSS-SECTION OF TRAIN UNDER CROSSWIND CONDITION

机译：横风条件下列车横断面流动的数值模拟研究

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摘要

Based on the 2D incompressible unsteady Navier-Stokes equations, an investigation on transient numerical simulation of crosswind over the cross-section of the CRH-2 (China Railways High-speed 2) has been carried out by the numerical calculation of space-time Galerkin/ least square method in this paper. Base on space-time Galerkin formulation, a program is developed to solve such problems on the FORTRAN platform, and is verified to be reliable based on the example of unsteady cavity flow when the Reynolds is equal to 400. In order to simulate crosswind past the cross-section of CRH-2, the Similarity Criterion is adopted. Three conditions are considered, under which the velocity of crosswind is 5m/s, 10m/s and 15m/s respectively. The results show that the maximum pressure appears in the windward of crosswind, and the minimum pressure appears on top of the upper boundary of the cross-section, besides, vortexes are found in top of the upper boundary of the cross-section. With the increment of the crosswind velocity, the total drag coefficient and pressure drag coefficient become larger, the lift coefficient become smaller, but there is no apparently difference in the friction drag coefficient.
机译：基于二维不可压缩的非稳态Navier-Stokes方程，通过时空Galerkin的数值计算，对CRH-2（中国铁路高速2）横截面的侧风瞬态数值模拟进行了研究。 /最小二乘法基于时空Galerkin公式，开发了一个程序来解决FORTRAN平台上的此类问题，并基于雷诺等于400时的非定常腔流实例验证了该程序的可靠性。在CRH-2横截面中，采用相似性准则。考虑三个条件，在此条件下，侧风的速度分别为5m / s，10m / s和15m / s。结果表明，最大压力出现在侧风的上风，最小压力出现在横截面的上边界的顶部，此外，在横截面的上边界的顶部发现了涡流。随着侧风速度的增加，总阻力系数和压力阻力系数变大，升力系数变小，但是摩擦阻力系数没有明显差异。

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