Effect of crosswinds on aerodynamic characteristics around a generic train model
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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2019
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/5000/ http://eprints.uthm.edu.my/5000/1/AJ%202018%20%28809%29%20Effect%20of%20crosswinds%20on%20aerodynamic%20characteristics%20around%20a%20generic%20train%20model.pdf |
| Summary: | 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 � 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. |
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