# Numerical Analysis on the Crosswind Influence Around a Generic Train Moving on Different Bridge Configurations

## Authors

• Izuan Amin Ishak Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia
• Nurshafinaz Maruai Malaysia Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia
• Fadhilah Mohd Sakri Universiti Kuala Lumpur – Malaysia Institute of Aviation Technology, Jalan Jenderam Hulu, Kampung Jenderam Hulu, 43900 Sepang, Selangor, Malaysia
• Rahmah Mahmudin Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia
• Nor Afzanizam Samiran Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia
• Syabillah Sulaiman Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia
• Shaiful Fadzil Zainal Abidin Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia
• Nik Normunira Mat Hassan Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia

## Keywords:

Aerodynamic loads, bridge, crosswind, flow regime, flow structure, generic train

## Abstract

In this article, a numerical approach is applied to study the flow regimes surround a generic train model travelling on different bridge configurations under the influence of crosswind. The bridge is varies based on the different geometry of the bridge girder. The crosswind flow angle (Ψ) is varied from 0° to 90°. The incompressible flow around the train was resolved by utilizing the Reynolds-averaged Navier-Stokes (RANS) equations combined with the SST k-ω turbulence model. The Reynolds number used, based on the height of the train and the freestream velocity, is 3.7 × 105. In the results, it was found that variations of the crosswind flow angles produced different flow regimes. Two unique flow regimes appear, representing (i) slender body flow behaviour at a smaller range of Ψ (i.e. Ψ ≤ 45°) and (ii) bluff body flow behaviour at a higher range of Ψ (i.e. Ψ ≥ 60°). As the geometries of the bridge girder were varied, the bridge with the wedge girder showed the worst aerodynamic properties with both important aerodynamic loads (i.e. side force and rolling moment), followed by the triangular girder and the rectangular girder. This was due to the flow separation on the windward side and flow structure formation on the leeward side, both of which are majorly influenced by the flow that moved from the top and below of the bridge structures.

## Author Biographies

### Izuan Amin Ishak, Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia

izuan@uthm.edu.my

### Nurshafinaz Maruai, Malaysia Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia

nurshafinaz@utm.my

### Rahmah Mahmudin, Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia

rahmah@uthm.edu.my

### Nor Afzanizam Samiran, Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia

afzanizam@uthm.edu.my

### Syabillah Sulaiman, Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia

syabillah@uthm.edu.my

### Nik Normunira Mat Hassan, Faculty of Engineering Technology, Department of Mechanical Engineering Technology, Universiti Tun Hussein Onn Malaysia, EDU Hab Pagoh, 84600 Johor, Malaysia

normunira@uthm.edu.my

2022-01-01

## How to Cite

Izuan Amin Ishak, Nurshafinaz Maruai, Mohd Sakri, F. ., Rahmah Mahmudin, Nor Afzanizam Samiran, Syabillah Sulaiman, Zainal Abidin, S. F. ., & Mat Hassan, N. N. . (2022). Numerical Analysis on the Crosswind Influence Around a Generic Train Moving on Different Bridge Configurations. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 89(2), 76–98. https://doi.org/10.37934/arfmts.89.2.7698

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