Abstract
As the volume of road traffic in Seoul, South Korea increases, underground transportation use and reach has expanded. Today, the subway system is a popular mode of transportation throughout Seoul. The authors have investigated indoor air quality (IAQ) within Seoul’s subway tunnels. Several factors influence the IAQ in a subway tunnel. However, the factor of train-induced wind has not been sufficiently studied, and understanding this factor is important in order to make comprehensive IAQ improvements. The airflow generated by a train entering and running through a tunnel is studied experimentally and numerically with the aim of gaining a solid understanding of the flow in the tunnel geometry and in the configuration with airshafts along the tunnel surface. To analyze the unsteady three-dimensional flow in the underground tunnel caused by the passage of a train, both experimental and computational studies have been conducted. The three-dimensional unsteady numerical analysis using the sharp interface method for the moving boundary of an immersed solid was carried out for the same geometric configurations as the experimental analysis.
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