高速列车穿越有竖井隧道流场的特性研究

给出了高速列车穿越隧道压力波的三维粘性流场数值模拟过程,控制方程为三维粘性、可压缩、等熵和非定常流的Navier-Stokes方程,空间离散采用了中心有限体积法格式,时间采用预处理二阶精度多步后差分格式进行离散,对隧道壁面采用壁面函数处理。在模拟中考虑了竖井的位置、竖井的断面积、竖井的数目等因素对隧道内压力及压力梯度的影响。计算结果表明,竖井的存在改变了压缩波的波前形状,从而使得隧道内的压力变化的最大值降低,因而能够降低隧道内的压力梯度最大值,但它并不能延长压力上升的时间。

Numerical simulation on an unsteady three-dimensional flow while high-speed train passing through tunnel with a shaft

A cell-centered finite volume scheme for numerical integration of Navier-Stokes equations has been presented here in three-dimensional unsteady viscous compressible isentropic flow to model the propagation of compression wave while the high-speed train passing through tunnel with shaft.The numerical procedure uses the on preconditioned second-order backward difference in time,the wall and bottom related to of tunnel are treated with wall functions and the motion of the train the tunnel is treated with sliding mesh technique.During the calculation,the effect of the shaft position,the shaft crosssection area and the numbers of the shaft to the pressure and pressure gradient magnitude are considered.The result shows that the shaft can alter the shape of the compression wave front during its propagation,so it decreases the maximum pressure amplitude and the maximum pressure gradient,but it can not delay the time of pressure rising.