고속철도차량의 터널교행시 터널압력파분석을 위한 3차원 비정상해석

초록

Flow field in tunnel as well as around tunnel portals induced when two trains pass through the tunnel in opposite direction has been simulated using 3 dimensional CFD program, FLUENT™. Unsteady Navier-Stokes calculation employing standard k-ε turbulence model has been conducted during the entrance and exit of trains through tunnel. To present the relative motion between the trains and tunnel, dynamic mesh method provided by FLUENT™. The train model is based on HEMU train which is being developed by Korea Railway Research Institute and the tunnel model is based on Honam high-speed line tunnel with 96.7m2 cross-sectional area and 1,140m length. Tetrahedral mesh and prism layer on the train model has been used and the number of mesh amounts to 5,700,000 cell for half of the tunnel with one train using rotational periodic boundary condition. The results show that the numerical methodology employing FLUENT™ was successful to simulate the flow field with relative motion between the trains and tunnel. The methodology developed in this study is expected to be used in the evaluation of pressure transient in high-speed railway tunnels with 3-dimensional shapes.