TY - JOUR ID - 162904 TI - Investigating the Effect of Clearance Distance between the Floor of a High-speed Train and Ground on Aerodynamic Forces in Presence of Side Wind JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Norouzi, S. AU - Hossainpour, S. AU - Rashidi, M. M. AD - Department of Mechanical Engineering, Sahand University of Technology, Tabriz, Iran AD - University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan, PR China Y1 - 2023 PY - 2023 VL - 36 IS - 4 SP - 604 EP - 614 KW - Turbulence model KW - High speed KW - wall function KW - finite volume method KW - simulation of turbulent flow DO - 10.5829/ije.2023.36.04a.01 N2 - The main objective of this paper was to propose the real model of the high speed train regarding the side wind disturbance. In the first part of this article, the turbulent air flow around a simplified design of a high-speed vehicle was numerically analyzed using finite volume method and four RANS turbulence models, including k-ω SST, k-ε RNG, Spalart-Almaras, and Launder and Sharma. The results of numerical simulations regarding the wall function were validated by experimental works and it was shown that in the area near the wall, the SST k-ω model had the best simulation for the horizontal component of the velocity (21% error). The results of the lift coefficients showed that at short distances from the train floor to the ground due to relatively strong wind with angles less than 0.2 radians, the lift coefficient was negative and as a result, the forces acting on the train were downward. Finally it was shown that by increasing the wind angle, this coefficient gradually becomes positive, which can disrupt the stability of the train. It can be concluded that in trains whose floor to ground distance is more than 0.136 of the train height, the balance is maintained only in the absence of side wind. UR - https://www.ije.ir/article_162904.html L1 - https://www.ije.ir/article_162904_7c30e03e0d9c89fbe801327968244759.pdf ER -