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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 104
PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Paper 38

Unsteady Simulations in Train Aerodynamics

S. Krajnovic

Department of Applied Mechanics, Vehicle Aerodynamics Laboratory, Chalmers University of Technology, Göteborg, Sweden

Full Bibliographic Reference for this paper
S. Krajnovic, "Unsteady Simulations in Train Aerodynamics", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 38, 2014. doi:10.4203/ccp.104.38
Keywords: large-eddy simulation, LES, partially-averaged Navier-Stokes, PANS, URANS, DES, train aerodynamics.

Summary
This paper presents the present status of unsteady simulations in train aerodynamics. The approaches range from large-eddy simulation, hybrid RANS-LES in the form of detached-eddy simulations and partially-averaged Navier-Stokes to unsteady Reynolds-averaged Navier-Stokes. Use of a hybrid technique called partially-averaged Navier-Stokes is discussed. Applications of different techniques are illustrated with examples from predictions of flows around generic train vehicles. Numerical prediction of crosswind stability and flow control of train-like vehicles is discussed.

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