Aerodynamics characteristics around simplified high speed train model under the effect of crosswinds

Mohd Salleh, Sufiah and Mat Ali, Mohamed Sukri and Shaikh Salim, Sheikh Ahmad Zaki and Ishak, I. A. and Shirakashi, Masataka and Muhammad, Sallehuddin (2017) Aerodynamics characteristics around simplified high speed train model under the effect of crosswinds. ARPN Journal of Engineering and Applied Sciences, 12 (8). pp. 2604-2609. ISSN 1819-6608

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Abstract

The aerodynamics problems of train commonly come when the flow pass through train body. The increasing speed of train to achieve highly technology demands has led to increase the forces and moments and increase sensitivity of train stability and may cause the train to overturn. In this paper, two prisms arranged in tandem represent a simplified model of high speed train are performed at different yaw angle ranging from 0˚ to 90˚ by using the unsteady ReynoldsAveraged Navier Stokes (URANS) equation combined with k-ω SST turbulence model. The Reynolds number is 3.14x105 based on height of the train and the free stream velocity. The aerodynamic quantities such as the side force, lift force and drag force coefficient show a similar trend where the forces increase with the yaw angle until a certain critical yaw angle before start to decrease till the yaw angle of 90˚. The flow structure around the train under the effect of crosswind is visualized. The vorticiticy start to form from the nose and slowly drifts away further towards the trailing edge. The two-dimensional mean streamlines on the cross-section of train at different yaw angle show that the size of vortex increase as the yaw angle increase. Time averaged pressure contour plotted on the cross section along x-axis show the variation of region between high pressure and low pressure region on the leeward and windward side of the train model that may cause train to overturn.

Item Type:	Article
Uncontrolled Keywords:	Crosswind; Flow structure; High speed train; K-ω SST turbulence model; URANS
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ170-179 Mechanics applied to machinery. Dynamics
Divisions:	Faculty of Engineering Technology > Department of Mechnical Engineering Technology
Depositing User:	UiTM Student Praktikal
Date Deposited:	03 Jan 2022 05:09
Last Modified:	03 Jan 2022 05:09
URI:	http://eprints.uthm.edu.my/id/eprint/5005

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