Numerical Simulations Of Pressure Wave Characterizations And Transient Mechanical Behavior Of Two High-Speed Trains Passing By Each Other

For the aerodynamic problem of two high-speed trains passing by each other in a two-lane tunnel, this paper carried out the following two tasks:1. The pressure wave of high-speed trains passing by each other in the tunnel was simulated numerically, by means of the technology of moving grids in computational fluid dynamics method, for seven different speed cases(200、250、300、350km/h and 200-250、 200-300、200-350 km/h). Here, the three-dimensional time related viscous compressible fluid Reynolds average Navier-Stokes equations and k-εtwo-equations turbulent model were employed. The waveform, peak value and the pressure amplitude of pressure waves for the seven different speed cases were discussed.2. Using FE software LS-DYNA 3D, based on the obtained pressure wave curves, the transient analysis of the train, including the stress-time curves and the Y-displacement time curves were conducted. And then the contribution rate of the pressure wave to the body structural strength was analyzed, and results indicate that within the scope of this study, the contribution rate increases with the relative speed of trains when the relative speed is more than 450km/h. And when it less than 450km/h, the contribution rate is very small. Finally, the difference of the dynamic response of windows of high-speed trains under pressure waves and static loads was compared, respectively. The results show that the use of pressure wave method is better for studying the safety of windows when high-speed train traveling in tunnels, compared to the use of static load method.The research results are significant for the investigation of pressure wave and the issue of the speed limit when high-speed trains travel in the tunnel, and ensuring the safety of the trains travelling in tunnels.