【摘要】 利用有限体积法对横风作用下列车周围的空气流场进行计算。结合车辆-轨道耦合动力学,采用任意拉格朗日-欧拉(ALE)方法处理列车与空气间存在的运动边界,实现了车辆系统动力学与计算流体力学之间的结合。以某国产客运列车为例,计算列车在20 m/s的横风作用下以160 km/h的速度运行时的动力学响应,给出列车周围的流场分布;分析了考虑与不考虑风-车之间流固耦合效应时,作用在车辆上的气动力和气动力矩的变化情况。结果表明,流固耦合效应对车体摇头力矩的影响比较大,而对于车体垂向、横向位移和加速度的影响甚微。更多还原

【Abstract】 A numerical method is presented to analyze the train and air interaction problems.The Finite Volume Method(FVM) is applied in computation of the unsteady three-dimensional wind field around the train in cross-winds.The dynamical responses of the vehicles to the resulting aerodynamical loads and rail irregularities are simulated by a program based on the vehicle-track coupling dynamics.A co-simulation VSD/CFD is implemented by employing the Arbitrary Lagrangian-Eulerian(ALE) Method to deal with the moving boundary between train and air.As an example,in which a typical Chinese-made passenger train runs at the speed of 160 km/h in cross-winds,and the winds are normal to the moving direction of the vehicle with the speed of 20 m/s,the flow structure and air forces and moments are predicted.Results show that the fluid-structure interaction(FSI) has significant influence on the yawing moment of the car body.As to the vertical displacement,lateral displacement and acceleration of the intermediate car body,there are very little difference between the results considering the FSI effect and the results without considering the FSI effect.更多还原