Influence of wind barrier on the transient aerodynamic performance of high-speed trains under crosswinds at tunnel–bridge sections. Issue 1 (1st January 2021)

• Record Type: Journal Article
• Authors: Yang, Weichao; Deng, E.; He, Xuhui; Luo, Lusen; Zhu, Zhihui; Wang, Youwu; Li, Zhitang
• Is Part Of: Engineering applications of computational fluid mechanics. Volume 15:Issue 1(2021)
• Page Start: 727
• Page End: 746
• Publication Date: 2021-01-01
• Subjects: Crosswind -- porous wind barrier (PWB) -- tunnel–bridge section (TBS) -- high-speed train (HST) -- aerodynamic coefficient; Computational fluid dynamics -- Periodicals; 620.10640285
• DOI: 10.1080/19942060.2021.1918257
• Languages: English
• ISSNs: 1994-2060

Abstract

Abstract : Porous wind barriers (PWBs) are gradually applied to tunnel–bridge–tunnel infrastructures (TBTIs) along high-speed railway lines. Due to the remarkable aerodynamic effect of high-speed trains (HSTs), the windproof performance of a PWB at tunnel–bridge section (TBS) is particularly critical when a HST passes through the TBTI under crosswind. And it seems to be easily ignored by researchers. This study aims to determine the influence mechanism of the PWB in the TBS. A CFD dynamic model of air–train–PWB was built based on porous media theory, and its reliability is verified by model and field tests. The main results are as follows: the corresponding variation amplitudes of the train's aerodynamic load coefficients are reduced by 36–95% when a PWB is set in the TBS; adopting the same design parameters along the full-length PWB on the TBTI is unreasonable; the PWB height and porosity in the TBS must be increased and reduced more than 33%, respectively, to achieve equivalent windproof performance. The conclusions in this paper can provide a preliminary idea for the optimization design of the PWB on the TBTI.