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Large eddy simulations of a typical European high-speed train inside tunnels
KTH, Superseded Departments, Aeronautical and Vehicle Engineering.
KTH, Superseded Departments, Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-2571-4662
2004 (English)Conference paper, Published paper (Refereed)
Abstract [en]

This article presents our results of external aerodynamics, obtained with Large Eddy Simulations(LES), about a typical European passenger-stock insidetunnels. The focal points are the aerodynamic forces andtheir typical frequencies applied to the tail. Two trainlengths and three tunnels are employed in the study tomodel the conditions of double and single-track bores.Owing to the relatively high numerical cost associated with LES for external train aerodynamics we could only afford sufficient spatial grid resolution on our shortest train. The flow simulations confirm the existence of coherent structures alongside the body that give rise to continuously propagating pressure disturbances. These disturbances with a relatively small amplitude and high spatial frequency cannot affect the ride comfort. Still,they are found to influence the flow separation about the tail, which is regarded as one of the candidate mechanisms to impair the ride comfort and running stability.

Place, publisher, year, edition, pages
2004.
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6370DOI: 10.4271/2004-01-0229Scopus ID: 2-s2.0-84877196310ISBN: 0768013194 (print)ISBN: 978-076801319-1 OAI: oai:DiVA.org:kth-6370DiVA: diva2:11063
Conference
2004 SAE World Congress, Detroit, MI, USA, 8-11 March 2004
Note

QC 20141210

Available from: 2006-11-21 Created: 2006-11-21 Last updated: 2014-12-10Bibliographically 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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