Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Numerical analysis of airflow around a passenger train entering the tunnel
Highlights Unsymmetrical effect of train entry only influences the maximum pressure. Blockage ratio and train speed are two main factors affect the first pressure wave. Maximum side force is generated when train is running the tunnel and equates to 900N.
Abstract In this paper, the characteristics of train-tunnel interaction at a tunnel entrance has been investigated numerically. A three-dimensional numerical model using the remeshing method for the moving boundary of a passenger train in Iran railway was applied. The turbulent flows generated by the moving train in a tunnel were simulated by the RNG κ−ε turbulence model. The simulations have been carried out to understand the effect of the train speed as well as the influences of the hoods and air vents on the pressure waves, drag, and side force coefficients. The results show that the maximum drag coefficient occurs when the train enters the tunnel and is equal to 2.2. The air vents and enlarged hood at the portal are demonstrated to attenuate the pressure gradient and drag coefficient about 28% and 36%, respectively. Furthermore when train is entering the tunnel asymmetrically, a side force is created that pushes the train toward the tunnel wall, which the maximum side force is 900N.
Numerical analysis of airflow around a passenger train entering the tunnel
Highlights Unsymmetrical effect of train entry only influences the maximum pressure. Blockage ratio and train speed are two main factors affect the first pressure wave. Maximum side force is generated when train is running the tunnel and equates to 900N.
Abstract In this paper, the characteristics of train-tunnel interaction at a tunnel entrance has been investigated numerically. A three-dimensional numerical model using the remeshing method for the moving boundary of a passenger train in Iran railway was applied. The turbulent flows generated by the moving train in a tunnel were simulated by the RNG κ−ε turbulence model. The simulations have been carried out to understand the effect of the train speed as well as the influences of the hoods and air vents on the pressure waves, drag, and side force coefficients. The results show that the maximum drag coefficient occurs when the train enters the tunnel and is equal to 2.2. The air vents and enlarged hood at the portal are demonstrated to attenuate the pressure gradient and drag coefficient about 28% and 36%, respectively. Furthermore when train is entering the tunnel asymmetrically, a side force is created that pushes the train toward the tunnel wall, which the maximum side force is 900N.
Numerical analysis of airflow around a passenger train entering the tunnel
Rabani, Mehrdad (Autor:in) / Faghih, Ahmadreza K. (Autor:in)
Tunnelling and Underground Space Technology ; 45 ; 203-213
13.10.2014
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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