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**Harvard**

Hemida, H. och Krajnovic, S. (2008) * LES Study of The Influence of a Train-Nose Shape on The Flow Structures Under the Influence of a Cross-Wind*.

** BibTeX **

@article{

Hemida2008,

author={Hemida, Hassan and Krajnovic, Sinisa},

title={ LES Study of The Influence of a Train-Nose Shape on The Flow Structures Under the Influence of a Cross-Wind},

journal={Journal of Fluid Engineering},

volume={130},

issue={9},

pages={091101},

abstract={Cross-wind flows around two simplified high-speed trains with different nose shapes are studied using large-eddy simulation (LES) with the standard Smagorinsky model. The Reynolds number is 300000 based on the height of the train and the free-stream velocity. The cross section and the length of the two train models are identical whilst one model has a nose length twice that of the other. The three-dimensional effects of the nose on the flow structures in the wake and on the aerodynamic quantities such as lift and side force coefficients, flow patterns, local pressure coefficient and wake frequencies are investigated. The short-nose train simulation shows highly unsteady and three-dimensional flow around the nose yielding more vortex structures in the wake. These structures result in a surface flow that differs from that in the long-nose train flow. They also influence the dominating frequencies that arise due to the shear-layer instabilities. Prediction of vortex shedding, flow patterns in the train surface and time-averaged pressure distribution obtained from the long-nose train simulation are in good agreement with the available experimental data.},

year={2008},

keywords={side wind, train aerodynamics},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 78897

A1 Hemida, Hassan

A1 Krajnovic, Sinisa

T1 LES Study of The Influence of a Train-Nose Shape on The Flow Structures Under the Influence of a Cross-Wind

YR 2008

JF Journal of Fluid Engineering

VO 130

IS 9

AB Cross-wind flows around two simplified high-speed trains with different nose shapes are studied using large-eddy simulation (LES) with the standard Smagorinsky model. The Reynolds number is 300000 based on the height of the train and the free-stream velocity. The cross section and the length of the two train models are identical whilst one model has a nose length twice that of the other. The three-dimensional effects of the nose on the flow structures in the wake and on the aerodynamic quantities such as lift and side force coefficients, flow patterns, local pressure coefficient and wake frequencies are investigated. The short-nose train simulation shows highly unsteady and three-dimensional flow around the nose yielding more vortex structures in the wake. These structures result in a surface flow that differs from that in the long-nose train flow. They also influence the dominating frequencies that arise due to the shear-layer instabilities. Prediction of vortex shedding, flow patterns in the train surface and time-averaged pressure distribution obtained from the long-nose train simulation are in good agreement with the available experimental data.

LA eng

LK http://scitation.aip.org/journals/doc/JFEGA4-ft/vol_130/iss_9/091101_1.html

OL 30