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The aerodynamic problems occuring need to be taken seriously with the increase of the design speed of subway trains, one of is the pressure wave in the tunnel. Therefore, it is important to study the pressure fluctuations when two trains passing through Urban Regional Railway Tunnel in the same direction. In this study, one-dimensional compressible unsteady non-hometropic flow model is used to establish the airflow equations, and the method of characteristics of generalized Riemann variables is adopted to solve the set of equations effectively. The exterior and interior pressure fluctuations of two trains are investigated and compared with that of a single train. The maximum negative pressure values, the maximum peak pressures and the maximum pressures change per 3 seconds of the two-trains situation are both larger than those of a single train. The results of this paper show that it is necessary to study the pressure fluctuations when there are multiple trains running in the tunnel.

Characteristics of the Pressure Wave Caused by Two Trains with the Same Speed Tracking in the Urban Regional Railway Tunnel