Numerical Simulation of 1-D Unsteady Compressible Flow in Railway Tunnels

When a train travels through a tunnel at high speed, large pressure variations are generated in the tunnel. It is thus essential to accurately predict these pressure variations when planning to increase the speed of Shinkansen or Maglev trains. We have developed a one-dimensional flow simulation program to calculate the pressure variations and the wind velocity in a high-speed railway tunnel. This program can perform predictions for tunnels with shafts and/or stations/terminals for train speeds up to about 500 km/h. The simulation results agree well with the results of model experiments.