Numerical Simulation of 1-D Unsteady Compressible Flow in Railway Tunnels(Fluids Engineering)

When a train runs through a tunnel at high speed, large pressure changes are generated in the tunnel. It is necessary, therefore, to predict these pressure changes accurately in planning speed-up of Shinkansen or Maglev trains. For this purpose, we have developed a one-dimensional flow simulation program to calculate the pressure changes and wind velocity in a high-speed railway tunnel. This program can make the prediction for tunnels with shafts and/or stations/terminal up to about 500km/h of the train-speed. The results of the simulation are found to be in good agreement with those of model experiments performed for verification.