In recent years, exhaust gas emission out of tunnel portals has been a problem. In order to maintain the environment around the tunnel portal, a concentrated exhaustion system is installed in some tunnels. In the area between the suction port and the portal, the air flows in the opposite direction to the traffic, so that the pollutant is sucked toward the exhaustion port. In order to grasp the detailed phenomena, the authors investigated quantitatively the extent of the pollutant, which is brought out of the tunnel portal, in terms of a three-dimensional numerical analysis. This simulation system includes a sliding mesh algorithm in order to express the movement of vehicles. A typical result of the suction velocity of 1.0 m/s showed that almost no emission out of the tunnel is observed in small car traffic.
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机译：近年来，从隧道入口排出的废气一直是一个问题。为了维护隧道入口周围的环境，在某些隧道中安装了集中排气系统。在吸气口和入口之间的区域中，空气以与交通相反的方向流动，因此污染物被吸向排气口。为了掌握详细的现象，作者通过三维数值分析定量地研究了从隧道入口带出的污染物的程度。该仿真系统包括一个滑动网格算法，以表达车辆的运动。吸气速度为1.0 m / s的典型结果表明，在小型汽车通行中几乎没有观察到从隧道出来的排放物。
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