TY - JOUR
ID - 5352
TI - A Computational Study on Aerodynamic Characteristics of a Simplified High-Speed Train: The Effects of Crosswinds and Surface Roughness
JO - International Journal of Nonlinear Analysis and Applications
JA - IJNAA
LA - en
SN - 2008-6822
AU - Hajipour, Alireza
AU - Mirabdolah Lavasani, Arash
AU - Eftekhari Yazdi, Mohammad
AD - Department of Mechanical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
Y1 - 2021
PY - 2021
VL - 12
IS - Special Issue
SP - 519
EP - 540
KW - The high-speed train
KW - Crosswind effects
KW - Yaw angle
KW - Surface roughness
KW - $\gamma-\widetilde{Re}_{\theta t}$ transitional model
DO - 10.22075/ijnaa.2021.23992.2647
N2 - 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.
UR - https://ijnaa.semnan.ac.ir/article_5352.html
L1 - https://ijnaa.semnan.ac.ir/article_5352_ee4e27f0314bbfd3cf69f3e9ad83ed3b.pdf
ER -