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Large eddy simulations of the flow around high-speed trains cruising inside tunnels
KTH, Superseded Departments, Aeronautical and Vehicle Engineering.
KTH, Superseded Departments, Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-2571-4662
2004 (English)In: ECCOMAS 2004 - European Congress on Computational Methods in Applied Sciences and Engineering / [ed] P. Neittaanmäki, T. Rossi, S. Korotov, E. Oñate, J. Périaux, and D. Knörzer, 2004, 1-21 p.Conference paper, Published paper (Refereed)
Abstract [en]

Stability and ride comfort of high-speed rolling stock are, for reasons of external aerodynamics, dependent on the external design in conjunction with properties of the vehicle dynamics and the design of the infrastructure, herein referring to the confining tunnel walls. It is a fact that some Japanese high-speed trains are quite prone to tail vehicle vibrations only inside tunnels, while (to the authors' knowledge) other nation's comparable train systems are not. In this context the current work describes our results of external aerodynamics, calculated with large eddy simulations, about two simplified train models inside two double track tunnels with comparable blockage ratio. These models are based on the German Inter-City Express 2 and the Japanese Series 300 Shinkansen trains. The focal points of this study are the origin of unsteady aerodynamic tail forces, their spectral characteristics and the impact of spontaneously emerging coherent flow structures adjacent to the train's surfaces. Full scale tests of the above trains have shown that only the Shinkansen train is subjected to a reduced ride comfort inside tunnels, with a quite obvious lateral vibration at about 2 Hz at top speed (300 km/h). Our unsteady flow calculations have successfully predicted the more detrimental lateral aerodynamic forces. In addition, a spectral analysis of the unsteady side force resulted in a quite prominent frequency at the Strouhal number of 0.09 (based on the speed and height of the train), which correlates well with the Japanese full scale tests.

Place, publisher, year, edition, pages
2004. 1-21 p.
Keyword [en]
Ride comfort, Ride instability, Tail car oscillation, Tail vehicle oscillation, Train aerodynamics, Tunnel aerodynamics
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6371Scopus ID: 2-s2.0-84893492515OAI: oai:DiVA.org:kth-6371DiVA: diva2:11064
Conference
European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS 2004, Jyvaskyla, Finland, 24-28 July 2004
Note

QC 20141211

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