Semnan University Press Journal of Transportation Infrastructure Engineering 2423-5350 4 3 2018 11 22 Analysis and Modeling of Pressure Wave at the Entrance of the High-Speed Train to Tunnel Analysis and Modeling of Pressure Wave at the Entrance of the High-Speed Train to Tunnel 45 63 3305 10.22075/jtie.2018.14682.1307 FA Mehrdad Jafari MSc. Student, School of Railway Engineering, Iran University of Science and Technology, Tehran, I. R. Iran. Mohammad Reza Talaee Assistant Professor, School of Railway Engineering, Iran University of Science and Technology, Tehran, I. R. Iran. Journal Article 2018 05 02 When a high-speed train enters into a tunnel, a pressure wave will be created. This leads to piston phenomenon in the tunnel, which affects all air currents in the tunnel. This phenomenon may lead to some problems in the long time like destruction of tunnel wall layers, safety of the passengers, ventilation of the subway stations and disturbing train balance. In this research, this phenomenon was investigated for entering of an ICE2 train to a single-line tunnel. Simulation is performed by using numerical solution in ANSYS Fluent CFD software considering sliding mesh, three-dimensional, incompressible and turbulent flow. The numerical method has been validated with an experimental test for the flow speed in the tunnel. Simulations have been done for 60, 80 and 100 m/s train speeds. Overal results showed that with increasing the train speed, the pressure domain and aerial wave speed will increase too. Finally, the strength of train’s front glass against maximum air wave has been studied and permissible train-speed range for entering the tunnel has been obtained. When a high-speed train enters into a tunnel, a pressure wave will be created. This leads to piston phenomenon in the tunnel, which affects all air currents in the tunnel. This phenomenon may lead to some problems in the long time like destruction of tunnel wall layers, safety of the passengers, ventilation of the subway stations and disturbing train balance. In this research, this phenomenon was investigated for entering of an ICE2 train to a single-line tunnel. Simulation is performed by using numerical solution in ANSYS Fluent CFD software considering sliding mesh, three-dimensional, incompressible and turbulent flow. The numerical method has been validated with an experimental test for the flow speed in the tunnel. Simulations have been done for 60, 80 and 100 m/s train speeds. Overal results showed that with increasing the train speed, the pressure domain and aerial wave speed will increase too. Finally, the strength of train’s front glass against maximum air wave has been studied and permissible train-speed range for entering the tunnel has been obtained. https://jtie.semnan.ac.ir/article_3305_24b549b3400cf45376cebd9f281a324b.pdf