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Aerodynamic of the trains in tunnels

Faramehr, Samane (2014)
M.Res. thesis, University of Birmingham.

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Abstract

When a train moves through air, it generates a turbulent flow around it called a slipstream. The slipstream is associated with high air velocities and rapidly-changing pressure fields. These aerodynamic issues are still valid when a train passes a tunnel and in addition to these, the compressibility of the air around high-speed trains produces what are called “micro-pressure waves” as a result of running in a confined space. The air velocity, pressure variation and direction of the flow inside tunnels is different to the slipstream in open air. These differences depend on the size of the tunnel (cross section and length of the tunnel) and the shape and speed of the train. In the present thesis, the effect of tunnel length on the flow and pressure inside is investigated. The investigation uses computational fluid dynamics techniques (CFD), in which a 1/25th model of the ICE2 train is used. Two tunnel lengths are investigated; one is double the length of the other. The sliding technique is employed to simulate the movement of the train in the tunnel. The simulation uses unsteady RANS and applies the Shear Stress Transport (SST) turbulence model. The effect of tunnel length on both pressure and velocity fields is discussed. The variation of the pressure at the entrance and exit of the tunnel is also analysed and conclusions are drawn.

Type of Work:M.Res. thesis.
Supervisor(s):Hemida, Hassan
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Civil Engineering
Subjects:TF Railroad engineering and operation
Institution:University of Birmingham
ID Code:5468
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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