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A Computational Study on Aerodynamic Characteristics of a Simplified High-Speed Train: The Effects of Crosswinds and Surface Roughness | ||
| International Journal of Nonlinear Analysis and Applications | ||
| دوره 12، Special Issue، اسفند 2021، صفحه 519-540 اصل مقاله (7.37 M) | ||
| نوع مقاله: Special issue editorial | ||
| شناسه دیجیتال (DOI): 10.22075/ijnaa.2021.23992.2647 | ||
| نویسندگان | ||
| Alireza Hajipour؛ Arash Mirabdolah Lavasani* ؛ Mohammad Eftekhari Yazdi | ||
| Department of Mechanical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran | ||
| تاریخ دریافت: 27 خرداد 1399، تاریخ بازنگری: 20 آذر 1399، تاریخ پذیرش: 19 دی 1399 | ||
| چکیده | ||
| The airflow around a simplified train model is investigated using a three-dimensional $\gamma-\widetilde{Re}_{\theta t}$ transitional approach. Four different yaw angles ($\theta = 10^{\circ}, 20^{\circ}, 30^{\circ}$, and $40^{\circ}$) perpendicular to the body of the simplified train model are considered which the magnitude of front air-flow is constant, and the magnitude of crosswind determines by yaw angle. The main aim of the research is to investigate the influences of the yaw angle and roughness on the time-averaged flow structure, turbulent quantities such as turbulent kinetic energy, dissipation rate, and the aerodynamic forces such as skin friction and pressure coefficients. The findings show that the yaw angle has a pronounced influence on the three-dimensional flow structure around the high-speed train. As the yaw angle augments, the aerodynamic forces like skin friction and pressure coefficients increase. Furthermore, the roughness has a negligible effect on the pressure coefficient. Also, the skin friction coefficient locally increases in the rough train body. | ||
| کلیدواژه‌ها | ||
| The high-speed train؛ Crosswind effects؛ Yaw angle؛ Surface roughness؛ $\gamma-\widetilde{Re}_{\theta t}$ transitional model | ||
| مراجع | ||
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[1] C. Catanzaro, F. Cheli, D. Rocchi, P. Schito and G. Tomasini, High-speed train crosswind analysis: CFD study and validation with wind-tunnel tests, Int. Conf. Engin. Conf. Int. Aerodyn. Heavy Vehicles III. (2016) 99–112. [2] H. Hemida and S. Krajnovi´c, LES study of the influence of the nose shape and yaw angles on flow structures around trains, J. Wind Engin. Indust. Aerodyn. 98(1) (2010) 34–46.[3] C.J. Bakera, J. Jones, F. Lopez-Calleja and J. Mundayd, Measurements of the cross wind forces on trains, J. Wind Engin. Indust. Aerodyn. 92(7) (2004) 547–563. [4] M.M. Fragner, K.A. Weinman, R. Deiterding, U. Fey and C. Wagner, Comparison of industrial and scientific CFD approaches for predicting cross wind stability of the NGT2 model train geometry, Int. J. Railway Tech. 4(1) (2015) 1–28. [5] J. Garc´ıa, A. Crespo, A. Berasarte and J. Goikoetxea, Study of the flow between the train underbody and the ballast track, J. Wind Engin. Indust. Aerodyn. 99(10) (2011) 1089–1098. [6] C. Baker, The simulation on of unsteady aerodynamic cross wind forces on trains. J. Wind Engin. Indust. Aerodyn. 98.2 (2010) 88–99. [7] S. Diasinos, T.J. Barber and G. Doig, The effects of simplifications on isolated wheel aerodynamics, J. Wind Engin. Indust. Aerodyn. 146 (2015) 90–101. [8] C. Paz, E. Su´arez, C. Gil and M. Concheiro, Numerical study of the impact of windblown sand particles on a high-speed train, J. Wind Engin. Indust. Aerodyn. 145 (2015) 87–93. [9] T. Li, M. Yu, J. Zhang and W. Zhang, A fast equilibrium state approach to determine interaction between stochastic crosswinds and high-speed trains, J. Wind Engin. Indust. Aerodyn. 143 (2015) 91–104. [10] C. Xia, X. Shan and Z. Yang, Wall interference effect on the aerodynamics of a high-speed train, Procedia Engin. 126 (2015) 527–531. [11] J. Copley, The three-dimensional flow around railway trains, J. Wind Engin. Indust. Aerodyn. 26(1) (1987) 21–52. [12] T. Chiu and L. Squire, An experimental study of the flow over a train in a crosswind at large yaw angles up to 90, J. Wind Engin. Indust. Aerodyn. 45(1) (1992) 47–74. [13] T. Chiu, Prediction of the aerodynamic loads on a railway train in a cross-wind at large yaw angles using an integrated two-and three-dimensional source/vortex panel method, J. Wind Engin. Indust. Aerodyn. 57(1) (1995) 19–39. [14] U. Hoppmann, S. Koenig, T. Tielkes and G. Matschke, A short-term strong wind prediction model for railway application: design and verification, J. Wind Engin. Indust. Aerodyn. 90.10 (2002) 1127–1134. [15] M. Suzuki, K. Tanemoto and T. Maeda, Aerodynamic characteristics of train/vehicles under cross winds, J. Wind Engin. Indust. Aerodyn. 91(1) (2003) 209–218. [16] B. Diedrichs, On computational fluid dynamics modelling of crosswind effects for high-speed rolling stock, Proc. Instit. Mech. Engin. Part F: J. Rail Rapid Trans.217(3) (2003) 203–226. [17] H. Hemida, S. Krajnovic and L. Davidson, Large-eddy simulation of the flow around a simplified high speed train under the influence of a cross-wind, 17th AIAA Comput. Fluid Dyn. Conf. 2005. [18] W. Khier, M. Breuer and F. Durst, Flow structure around trains under side wind conditions: a numerical study, Comput. Fluids 29(2) (2000) 179–195. [19] J. Garc´ıa, J. Munoz-Paniagua and A. Crespo, Numerical study of the aerodynamics of a full scale train under turbulent wind conditions, including surface roughness effects, J. Fluids Struct. 74 (2017) 1–18. [20] Y. Zhuang and X. Lu, Numerical investigation on the aerodynamics of a simplified high-speed train under crosswinds, Theo. Appl. Mech. Lett. 5(5) (2015) 181–186. [21] C. Baker, The flow around high speed trains, J. Wind Engin. Indust. Aerodyn. 98(6) (2010) 277–298. [22] R.B. Langtry and F.R. Menter, Correlation-based transition modeling for unstructured parallelized computational fluid dynamics codes, AIAA J. 47(12) (2009) 2894–2906. [23] P. Ji, F. Wu, G. Zhang, X. Yin and D. Vainchtein, A novel numerical approach for investigation of the heat transport in a full 3D brake system of high-speed trains, Numerical Heat Trans. Part A: Appl. 75(12) (2019) 824–840. [24] M.M. Rashidi, A. Hajipour, T. Li, Z. Yang and Q. Li, A review of recent studies on simulations for flow around high-speed trains, J. Appl. Comput. Mech. 5(2) (2019) 311–333. | ||
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