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On the aerodynamics of car body vibrations of high-speed trains crusing inside tunnels
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology.ORCID iD: 0000-0002-2571-4662
2008 (English)In: ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS, ISSN 1994-2060, Vol. 2, no 1, 51-75 p.Article in journal (Refereed) Published
Abstract [en]

Aerodynamically induced car body vibrations of high-speed trains inside tunnels have for approximately two decades been recognized as a problem in Japan, while other nations' high-speed rail services have not reported similar problems. In order to shed light on this contradiction the scope of the present paper is to primarily explore tail car vibrations of Deutsche Bahn AG's high-speed train ICE 2 and Japan Railways series 300 Shinkansen train. Despite similarities of these two trains the problems are reported only for the latter. Several large eddy simulations are carried out to predict the aerodynamics around simplified and smooth models of the above mentioned trains inside tunnels. The results focus on the ability to resolve PPD (propagating pressure disturbances) generated alongside the bodies, unsteady aerodynamic forces and their corresponding frequencies. Mesh refinement studies are undertaken for both train models, where mesh independence is quite a challenge for this type of application. Affordable meshes appropriate for LES could only be achieved for models confined to a typical car length. For smooth models and for a model with three generic inter-car gaps, the high spatial frequency of the resolved PPD does not make them sufficient to upset the ride quality of a car. A low frequency mode that strongly affects the forces of the tail of the Shinkansen models is described, which is caused by the confinement of the tunnel walls. A study of the implications of the lateral distance to the wall is further investigated. The findings reveal that the effects of the low frequency mode intensify with a narrow wall clearance, corresponding to the nominal lateral position of the train.

Place, publisher, year, edition, pages
2008. Vol. 2, no 1, 51-75 p.
Keyword [en]
train aerodynamics, tunnel aerodynamics, tail vehicle oscillation, flow-induced vibrations, lateral ride comfort, ride instability and large eddy simulation
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6372ISI: 000207526900006OAI: oai:DiVA.org:kth-6372DiVA: diva2:11065
Note
QC 20110118Available from: 2006-11-21 Created: 2006-11-21 Last updated: 2011-01-18Bibliographically approved
In thesis
1. Studies of Two Aerodynamic Effects on High-Speed Trains: Crosswind Stability and Discomforting Car Body Vibrations Inside Tunnels
Open this publication in new window or tab >>Studies of Two Aerodynamic Effects on High-Speed Trains: Crosswind Stability and Discomforting Car Body Vibrations Inside Tunnels
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2006. viii, 74 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2006:81
Keyword
train aerodynamics, external aerodynamics, tunnel aerodynamics, computational fluid dynamics
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-4174 (URN)
Public defence
2006-11-23, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20110118Available from: 2006-11-21 Created: 2006-11-21 Last updated: 2011-01-18Bibliographically approved

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Berg, Mats

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