Detached-eddy simulation of the slipstream of an operational freight train

Flynn, Dominic and Hemida, Hassan and Soper, David and Baker, Chris (2014) Detached-eddy simulation of the slipstream of an operational freight train. Journal of Wind Engineering and Industrial Aerodynamics, 132 (Sep-14). pp. 1-12. ISSN 0167-6105

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With increasing train speeds the subsequent increase in slipstream velocities can have a detrimental effect on the safety of persons in close proximity to the vehicle. Due to their uneven loading and bluff geometries, freight trains can produce higher slipstream velocities than passenger trains at given measurement locations. The highly turbulent non-stationary slipstream of a model-scale Class 66 locomotive and wagons was investigated using delayed detached-eddy simulation (DDES). The Reynolds number of the flow was 300,000 and results were compared for meshes of 25 and 34 million hexahedral cells. Good agreement was observed between the DDES and model-scale physical experiments. Slipstream velocities along the train side and roof were investigated and the bogie region was seen to produce the highest slipstream velocities. A comparison between time-averaged and ensemble-averaged data from the simulations gave comparable results. The technical standards for interoperability (TSI) analysis showed that the slipstream velocities generated were below half of the maximum permissible value of the standard whereas the pressure was 43% greater than the limiting value. Furthermore the presence of a periodic phenomenon is detected above the roof of the locomotive.

Item Type: Article
Identification Number:
Date: 5 July 2014
Uncontrolled Keywords: Freight train; Slipstream; Computational fluid dynamics (CFD); TSI; Numerical simulation; DDES
Subjects: G100 Mathematics
G900 Others in Mathematical and Computing Sciences
H100 General Engineering
H900 Others in Engineering
Divisions: Faculty of Computing, Engineering and the Built Environment
Faculty of Computing, Engineering and the Built Environment > School of Engineering and the Built Environment
REF UoA Output Collections > REF 2021 UoA12: Engineering
Depositing User: Euan Scott
Date Deposited: 25 Jan 2019 16:01
Last Modified: 08 Oct 2020 16:16

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