A numerical investigation is presented in which the effect of crosswinds on the slipstream of a fully-loaded model-scale freight train is studied. The work used delayed detached-eddy simulation in order to produce accurate time-averaged data and also allowed for the instantaneous flow to be analysed. Significant slipstream amplification is shown for both pressure and velocity transients on the leeward side of the train. The most significant slipstream amplification is observed at the 30° yaw angle case where high velocities remain almost constant at the furthest measurement position from train side. Instantaneous slipstream velocities on the leeward side of the train were inputted into a mathematical model which was used to predict the effect of wind gusts on a representative sample of the population. It was found that at 4 m from train side the person instability due to slipstream amplification for the 30° case is nearly double that from the 10° case. The results presented highlight the potential risk associated with slipstream amplification around freight trains, although due to the immaturity of the field, no amendments are made to the codes of practice.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:675771 |
| Date | January 2015 |
| Creators | Flynn, Dominic |
| Publisher | University of Birmingham |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://etheses.bham.ac.uk//id/eprint/6327/ |
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