Pressure wave characteristics of high-speed maglev train passing through tunnel groups

In order to explore the influence of tunnel group effect on aerodynamic safety of vehicle body and tunnel structure, the pressure wave characteristics of high-speed maglev trains passing through tunnel groups with different spacing distances were investigated by numerical simulation and compared with that of single short and long tunnels. The results show that the tunnel group effect has greater impact on the train than on the tunnel. As the tunnel spacing distance equals to 0.2 times of the train length, the maximum pressure amplitude of train is 14.7% larger than that of a single short tunnel and 16.3% larger than that of a single long tunnel. Furthermore, the maximum pressure amplitude on the train surface decreases with the increase of the tunnel spacing distance in ladder-type. When the tunnel spacing distance grows from 0.2 times of the train length to 1.0 times of the train length, the maximum pressure amplitude increases by 10% approximately, but the change of the maximum pressure amplitude on the tunnel surface is only less than 2%. © 2022, Central South University Press. All right reserved.