Exploring flow structures around a simplified ICE2 train subjected to a 30° side wind using LES

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Exploring flow structures around a simplified ICE2 train subjected to a 30° side wind using LES. / Hemida, Hassan; Krajnović, Siniša.

In: Engineering Applications of Computational Fluid Mechanics, Vol. 3, No. 1, 01.01.2009, p. 28-41.

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@article{a6c1cc30c62549de9b03197697de959e,
title = "Exploring flow structures around a simplified ICE2 train subjected to a 30° side wind using LES",
abstract = " Large-eddy simulation (LES) is conducted to investigate the flow around a simplified ICE2 train under side wind conditions at 30° yaw angle. The Reynolds number based on the height of the train and the free stream velocity is 2×10 5 . Two computations on two different meshes with different numbers of nodes are made to check the effect of the mesh resolution on the results. The fine and the coarse meshes give similar results meaning that the results are mesh independent. The results are also verified against available experimental data. Good agreement is obtained between the LES results and the experimental data. The LES results show that two flow regimes exist in the wake. The first flow regime consists of steady vortex lines in the upper part of the wake flow. It changes into unsteady shedding after a distance of about five train heights from their onset on the surface of the train. The second flow regime is the unsteady movement of the lower part of the wake vortices. They attach and detach from the surface of the train in a regular fashion. The time-averaged flow and the instantaneous flow around the ICE2 train at 30° yaw angle are explored. ",
keywords = "Flow structures, ICE2 train, LES, Side wind, Train aerodynamics",
author = "Hassan Hemida and Sini{\v s}a Krajnovi{\'c}",
year = "2009",
month = jan,
day = "1",
doi = "10.1080/19942060.2009.11015252",
language = "English",
volume = "3",
pages = "28--41",
journal = "Engineering Applications of Computational Fluid Mechanics",
issn = "1994-2060",
publisher = "Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University",
number = "1",

}

RIS

TY - JOUR

T1 - Exploring flow structures around a simplified ICE2 train subjected to a 30° side wind using LES

AU - Hemida, Hassan

AU - Krajnović, Siniša

PY - 2009/1/1

Y1 - 2009/1/1

N2 - Large-eddy simulation (LES) is conducted to investigate the flow around a simplified ICE2 train under side wind conditions at 30° yaw angle. The Reynolds number based on the height of the train and the free stream velocity is 2×10 5 . Two computations on two different meshes with different numbers of nodes are made to check the effect of the mesh resolution on the results. The fine and the coarse meshes give similar results meaning that the results are mesh independent. The results are also verified against available experimental data. Good agreement is obtained between the LES results and the experimental data. The LES results show that two flow regimes exist in the wake. The first flow regime consists of steady vortex lines in the upper part of the wake flow. It changes into unsteady shedding after a distance of about five train heights from their onset on the surface of the train. The second flow regime is the unsteady movement of the lower part of the wake vortices. They attach and detach from the surface of the train in a regular fashion. The time-averaged flow and the instantaneous flow around the ICE2 train at 30° yaw angle are explored.

AB - Large-eddy simulation (LES) is conducted to investigate the flow around a simplified ICE2 train under side wind conditions at 30° yaw angle. The Reynolds number based on the height of the train and the free stream velocity is 2×10 5 . Two computations on two different meshes with different numbers of nodes are made to check the effect of the mesh resolution on the results. The fine and the coarse meshes give similar results meaning that the results are mesh independent. The results are also verified against available experimental data. Good agreement is obtained between the LES results and the experimental data. The LES results show that two flow regimes exist in the wake. The first flow regime consists of steady vortex lines in the upper part of the wake flow. It changes into unsteady shedding after a distance of about five train heights from their onset on the surface of the train. The second flow regime is the unsteady movement of the lower part of the wake vortices. They attach and detach from the surface of the train in a regular fashion. The time-averaged flow and the instantaneous flow around the ICE2 train at 30° yaw angle are explored.

KW - Flow structures

KW - ICE2 train

KW - LES

KW - Side wind

KW - Train aerodynamics

UR - http://www.scopus.com/inward/record.url?scp=84921628007&partnerID=8YFLogxK

U2 - 10.1080/19942060.2009.11015252

DO - 10.1080/19942060.2009.11015252

M3 - Article

AN - SCOPUS:84921628007

VL - 3

SP - 28

EP - 41

JO - Engineering Applications of Computational Fluid Mechanics

JF - Engineering Applications of Computational Fluid Mechanics

SN - 1994-2060

IS - 1

ER -