열차/터널 공력 모델에 대한 전산 해석법

초록

When a train passes through a tunnel, various aerodynamic phenomena occur. When a vehicle enters a tunnel with smaller cross-sectional area than open area, pressure increase occurs. First, pressure waves generated at entrance of the tunnel propagate toward the exit of the tunnel, causing micro-pressure waves. Second, pressure increase generated in the tunnel propagates into the train cabin and causes ear-discomfort. Third, pressure increase in the tunnel causes an increase in aerodynamic drag of the train. Fourth, yawing motion of vehicle increases due to pressure unbalance on left and right sides of vehicle traveling inside the tunnel. To understand these phenomena, aerodynamic analysis of the train/tunnel model is required. In this study, a computational characteristic analysis method using a fixed grid system was developed for an aerodynamic model of train tunnels.

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