Unraveling the impact of cutting transition section on the aerodynamic loads of high-speed trains: Utilizing the IDDES approach

• Published in: Journal of Central South University Vol. 31; no. 3; pp. 989 - 1002
• Main Authors: Zhao, Lun, Deng, E., Yang, Wei-chao, Ni, Yi-qing, Zhao, Wen, Luo, Lu-sen
• Format: Journal Article
• Language: English
• Published: Changsha Central South University 01.03.2024; Springer Nature B.V
• Subjects: Aerodynamic loads; Crosswinds; Cutting parameters; Detached eddy simulation; Engineering; High speed rail; Metallic Materials; Three dimensional models; Turbulence models; Wind effects; Wind speed; crosswind; 路堑过渡段; 流场; high-speed trains; 横风; flow field; 高速列车; 气动荷载; cutting transition section; aerodynamic load
• ISSN: 2095-2899; 2227-5223
• DOI: 10.1007/s11771-024-5595-6

The aerodynamic load of high-speed trains (HSTs) undergoes significant changes when they pass through the transition section of the cutting under crosswind conditions. This paper establishes a coupled train-cutting-wind three-dimensional aerodynamic model based on the improved delayed detached eddy simulation turbulence model, focusing on the influence of the cutting depth on the change of aerodynamic load and the deterioration of the train’s aerodynamic performance, while also revealing the mechanism of the evolution of the flow field. The results indicate that at the cutting depth of 6 m, the aerodynamic impact energy of the head train during operation is at its highest. As the train completely enters the next operational scenario, with an increase in the cutting depth, the impact of incoming flow on the aerodynamic loads of the train is diminished, leading to a corresponding reduction in fluctuation amplitude. The magnitude of the head train’s abrupt change in aerodynamic load has a near-linear positive correlation with the wind speed.