Numerical Simulation On Wind Pressure
Transients In High Speed Train Tunnels
Author(s)
S.-W. Nam
Abstract
When a train passes through a tunnel with high speed, pressure waves are
generated due to the entry of the front and the rear of the train respectively.
These pressure waves are alternately propagated and reflected at the exit and
entrance of the tunnel. Severe pressure transients cause the repeated fatigue load
to the car-body and tunnel wall, ear-discomfort to passengers, and micro
pressure wave to the surroundings of the tunnel exit. To clarify quantitative
pressure change in the tunnel is very important for the optimal design of the
tunnel size. Partial differential equations also can be converted into ordinary
differential equations by using the method of characteristics. In this study, we
have developed a simulation program to calculate pressure transients in a
railroad tunnel. The method of characteristics based on a fixed mesh system is
used to solve the governing equations. By using this program, we have predicted
pressure transients in KTX (Korea Train eXpress)-tunnel and compared with
experimental results that are obtained in Unju tunnel with KTX high speed
trains. The results of calculation coincide with the ones of the Unju tunnel tests,
and the pressure transient mechanism was made clear. To analyze the effects of
train speed and blockage ratio, we have conducted parametric simulations. The
results show that pressure rise in a tunnel is proportional to the square of train
speed and to the blockage of train/tunnel cross sectional area.
Keywords: wind pressure, high speed train, tunnel flow, pressure wave.
Keywords
wind pressure, high speed train, tunnel flow, pressure wave.
Related Book
Other papers in this volume
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