Abstract
Compression wave is generated when a high-speed train enters a tunnel. Intention of micro-pressure wave is roughly proportional to pressure gradient. We are obtain it 3-dimentional large eddy simulation. The train enters to the tunnel at three different tunnel pattern, one is only tunnel, the other pattern is with portal hood without window, and the other is hood with window. This simulation uses weakly-compressible fluid with involvement of viscosity analysis method and sliding mesh method. Analysis result show that hood and window have slow the formation of a compression wave. So, maximum pressure gradient reduce. The maximum pressure gradient is reduced 42% compared to only tunnel and hood with window.
