Effect of crosswinds on aerodynamic characteristics around a generic train model

Izuan Amin Ishak, Mohamed Sukri Mat Ali, Mohamad Fitri Mohd Yakub and Sheikh Ahmad Zaki Shaikh Salim

International Journal of Rail Transportation, 2019, vol. 7, issue 1, 23-54

Abstract: In this article, simulations of crosswinds over a rectangular prism with two types of train nose shapes (i.e. blunt and ellipse) that are running on flat ground case are discussed. The incident flow angle is varied from 0° to 90°. The flow around the train is solved using the incompressible form of the unsteady Reynolds Navier-Stokes (URANS) equations combined with the Shear-Stress-Transport $$k - \omega $$k−ω turbulence model. The Reynolds number used, based on the height of the train is 3.7 × 105. Two distinctive flow regimes appear which represent a slender body behaviour at a smaller range of incident flow angles (below 45°) and bluff body behaviour at a much higher range of incident flow angles (above 45°). The safety guidelines for train’s operation suggested that both the train’s nose geometry and the wind speed condition are the two major factors that limit the maximum allowable speed for a particular train to be travelling.

Date: 2019
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DOI: 10.1080/23248378.2018.1424573

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