An IDDES study on a train suffering a crosswind with angles of attack on a bridge. Issue 217 (October 2021)

• Record Type: Journal Article
• Authors: Guo, Zijian; Liu, Tanghong; Liu, Zhen; Chen, Xiaodong; Li, Wenhui
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 217(2021)
• Publication Date: 2021-10
• Subjects: High-speed train -- Bridge -- Aerodynamic -- Angle of attack -- IDDES -- Crosswind; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2021.104735
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: The angle of attack of the crosswind gives a significant influence on the aerodynamic performances of the train running on a bridge. The improved delayed detached-eddy simulation (IDDES) method was employed to predict the aerodynamic characteristics of a generic train under a crosswind with different angles of attack. The numerical results were verified by wind tunnel tests. It was proven that the angle of attack of the crosswind has a significant influence on the train's time-averaged and transient lateral and vertical forces. The differences in terms of the distribution of pressure, velocity components, streamlines, and vorticity with regard to the angle of attack were compared and analyzed. Trains located on both windward and leeward were considered. Different crosswinds and the bridge form a coupling effect of the flow, which then acts on the trains. The upward crosswind thus produces more different flow patterns around the train. Highlights: Angle of attack of the crosswind matters the train's aerodynamic performance on a bridge. The influence on the train's time-averaged and transient lateral and vertical forces. The surrounding flow pattern of the train was significantly affected. Crosswind with a positive angle of attack can more disturb the original flow field.