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Numerical and Experimental Studies of Train Geometries subject to Cross Winds

Fragner, Moritz and Weinman, Keith and Deiterding, Ralf and Fey, Uwe and Wagner, Claus (2014) Numerical and Experimental Studies of Train Geometries subject to Cross Winds. Civil-Comp Press, Stirlingshire, UK. The Second International Conference on Railway Technology: Research, Development and Maintenance, 08. - 11. April 2014, Ajaccio, Corsica, France. ISSN 1759-3433

Full text not available from this repository.

Official URL: http://www.civil-comp.com/conf/railways2014.htm

Abstract

Safety assessments of cross-wind influence on high-speed train operation requires a detailed investigation of the aerodynamic forces acting on a vehicle. European norm 14067-6 permits the derivation of required integral force and moment coefficients by experiments as well as by numerical simulation. Utilising the DLR’s Next Generation Train 2 model geometry, we have performed a case study using incompressible steady RANS simulations from the OpenFOAM fluid dynamics solver software. Validation data for the exact same model configuration and moderate Reynolds numbers 250,000 and 450,000 is provided by side wind tunnel experiments. Highly resolved cross verification computations with the compressible DLR TAU code confirm that yaw angles > 30 degrees create major vortex systems on the leeward side of the train leading to sizeable uncertainties in predicted integral coefficients. At low to intermediate wind angles the flow remains attached and absolute errors in integral quantities decline with decreasing yaw angles. A consistent relative difference to the experimental results greater than 10%, however, raises doubts about the suitability of the RANS approach for accurately assessing such configurations in general and indicates that such comparably inexpensive simulations, presently performed by routine in industry, will typically not be sufficient to satisfy the accuracy requirements of EN 14067-6.

Item URL in elib:https://elib.dlr.de/87271/
Document Type:Conference or Workshop Item (Speech)
Additional Information:doi: 10.4203/ccp.104.24
Title:Numerical and Experimental Studies of Train Geometries subject to Cross Winds
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fragner, Moritzmoritz.fragner (at) dlr.deUNSPECIFIED
Weinman, Keithkeith.weinman (at) dlr.deUNSPECIFIED
Deiterding, Ralfralf.deiterding (at) dlr.deUNSPECIFIED
Fey, Uweuwe.fey (at) dlr.deUNSPECIFIED
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Date:2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-19
Editors:
EditorsEmail
Pombo, J.UNSPECIFIED
Publisher:Civil-Comp Press, Stirlingshire, UK
Series Name:Conference Proceedings on USB-Stick, Civil Comp Proceedings
ISSN:1759-3433
Status:Published
Keywords:trains aerodynamics, cross-wind stability, drag prediction, computational fluid dynamics, experiments, vortex shedding, RANS
Event Title:The Second International Conference on Railway Technology: Research, Development and Maintenance
Event Location:Ajaccio, Corsica, France
Event Type:international Conference
Event Dates:08. - 11. April 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Project Next Generation Train II (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Micknaus, Ilka
Deposited On:20 May 2014 13:20
Last Modified:20 Oct 2014 13:55

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