Study of Parameters Influencing Aerodynamics of Train-Tunnel System

Various aerodynamic effects are produced as the train passes through a tunnel, especially when the train speed is high. These effects depend on a wide range of variables such as train speed, tunnel geometry, and train area. For the safety of the train and the passengers, it is crucial to understand the relationship between these variables and the aerodynamic effects. The goal of the current study is to determine which combination of these factors has the highest impact on the train-tunnel aerodynamics by analysing the pressure variation of these combinations. For different set of parameters, the pressure-time history curves are plotted and analysed to obtain the critical combination of parameters. The aerodynamic loads coming on to the train and the passenger comfort criteria for this critical combination are also discussed.