EFFECTS OF CROSSWINDS ON THE FLOW STRUCTURE AROUND A NEXT-GENERATION HIGH-SPEED TRAIN EXITING A TUNNEL

Mohammad Arafat; Sakthiraaj Rajendran; Izuan Amin Ishak; Muhammad Al, Ain Mat Zin

doi:10.11113/jurnalteknologi.v86.20475

Authors

Mohammad Arafat Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, Bandar Universiti Pagoh, Johor-84600, Malaysia https://orcid.org/0000-0002-6486-8015
Sakthiraaj Rajendran Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, Bandar Universiti Pagoh, Johor-84600, Malaysia
Izuan Amin Ishak Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, Bandar Universiti Pagoh, Johor-84600, Malaysia
Muhammad Al, Ain Mat Zin Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, Bandar Universiti Pagoh, Johor-84600, Malaysia

DOI:

https://doi.org/10.11113/jurnalteknologi.v86.20475

Keywords:

Aerodynamics, computational fluid dynamics (CFD), crosswinds, infrastructure, tunnel exit

Abstract

This study investigates the effect of crosswind on the aerodynamic behavior of the Next-Generation High-Speed Train (NG-HST) model when exiting a tunnel. Utilizing a 1/25^th scale model, three distinct train exit positions and four crosswind yaw angles (15°, 30°, 45°, and 60°) were considered. Computational Fluid Dynamics (CFD) simulation with the k-ε turbulence model was used to simulate the flow structure around the train at the crosswind velocity of 25 m/s. A mesh independence study was performed to ensure that the results were not influenced by mesh sizing. Furthermore, existing wind tunnel experiment data was used to validate the mesh setup. The results showed that the crosswind angle had a significant effect on the aerodynamic flow behavior of the train as it exited the tunnel. The airflow pattern on the train surface exhibited significant changes, and variations in pressure distribution were observed on both the leeward and windward sides of the train. Moreover, the cars outside the tunnel experienced greater pressure than the cars inside the tunnel. As the last car of the train emerged from the tunnel, the strong crosswind altered the vortex structure, particularly around the head car, emphasizing its critical role in ensuring safe train operation. The results can be used to improve the design of wind barriers and other infrastructure along the railway tracks to improve the operational stability and safety of high-speed trains.

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