Aerodynamic simulation of effects of one- and two-side windbreak walls on a moving train running on a double track railway line subjected to strong crosswind

Niu, Jiqiang; Zhang, Yingchao; Li, Rui; Chen, Zheng-Wei; Yao, Huadong; Wang, Yueming

doi:10.1016/j.jweia.2022.104912

Cited by 39 publications

(6 citation statements)

References 54 publications

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“…With IDDES, the sub-grid length scale is determined using the grid size and distance from the wall. Therefore, IDDES can effectively solve for the turbulence near the wall and avoid Windsheltering performance of wind barriers simulated stress loss (Spalart et al, 2006) and premature flow separation; it also has advantages in the analysis of large-scale flow separation (Niu et al, 2022). In this study, IDDES based on the SST k-v turbulence model was used to simulate the flow behind the wind barrier.…”

Section: Computational Methods and Turbulence Modelingmentioning

confidence: 99%

Flow characteristics and wind-sheltering performance of wind barriers with different diameters of holes on railway viaducts

Liu

Gao

et al. 2023

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Purpose Constructing porous wind barriers is one of the most effective approaches to increase the running safety of trains on viaducts in crosswinds. This paper aims to further improve the wind-sheltering performance of the porous wind barriers. Design/methodology/approach Improved delayed detached eddy simulations based on the k-ω turbulence model were carried out, and the results were validated with wind tunnel tests. The effects of the hole diameter on the flow characteristics and wind-sheltering performance were studied by comparing the wind barriers with the porosity of 21.6% and the hole diameters of 60 mm–360 mm. The flow characteristics above the windward and leeward tracks were analyzed, and the wind-sheltering performance of the wind barriers was assessed using the wind speed reduction coefficients. Findings The hole diameters affected the jet behind the wind barriers and the recirculation region above the tracks. Below the top of the wind barriers, the time-averaged velocity first decreased and then increased with the increase in the hole diameter. The wind barrier with the hole diameter of 120 mm had the best wind-sheltering performance for the windward track, but such barrier might lead to overprotection on the leeward track. The wind-sheltering performance of the wind barriers with the hole diameters of 240 mm and 360 mm was significantly degraded, especially above the windward track. Originality/value The effects of the hole diameters on the wake and wind-sheltering performance of the wind barriers were studied, by which the theoretical basis is provided for a better design of the porous wind barrier.

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Section: Computational Methods and Turbulence Modelingmentioning

confidence: 99%

Flow characteristics and wind-sheltering performance of wind barriers with different diameters of holes on railway viaducts

Liu

Gao

et al. 2023

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“…Establishing an intercity railway system that matches the development of regional cities becomes an indispensable part of modern urban agglomerations and an important part of promoting regional economic development (Zhang et al , 2020). While increasing the running speed of trains brings convenience to intercity commuting, a series of operational safety problems will also become more prominent (Yang et al , 2019; Zhou et al , 2020; Chen et al , 2022b; Liu et al , 2022; Niu et al , 2022). In a complex crosswind environment, such as an embankment or viaduct, the train’s aerodynamic performance and index of operational safety will change dramatically (Diedrichs et al , 2007; Li et al , 2011a; Giappino et al , 2016; Baker and Sterling, 2018; Zhang et al , 2018; Li et al , 2022a; Yang et al , 2022), which seriously threatens the stability, safety and ride comfort of the train’s operation (Avila-Sanchez et al , 2017; Chen et al , 2018; Chen et al , 2019a; Jin et al , 2020; Chen et al , 2021).…”

Section: Introductionmentioning

confidence: 99%

Influence of wind and rain environment on operational safety of intercity train running on the viaduct

Zeng

Huang

et al. 2023

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Purpose Based on the aerodynamic loads and dynamic performances of trains, this study aims to investigate the effect of crosswinds and raindrops on intercity trains operating on viaducts to ensure the safe operation of intercity railways in metropolitan areas. Design/methodology/approach An approach coupled with the Euler multiphase model as well as the standard k-ɛ turbulence model is used to investigate the coupled flow feature surrounding trains and viaducts, including airflow and raindrops, and the numerical results are validated with those of the wind tunnel test. Additionally, the train’s dynamic response and the operating safety region in different crosswind speeds and rainfall is investigated based on train’s aerodynamic loads and the train wheel–rail dynamics simulation. Findings The aerodynamic loads of trains at varying running speeds exhibit an increasing trend as the increase of wind speed and rainfall intensity. The motion of raindrop particles demonstrates a significant similarity with the airflow in wind and rain environments, as a result of the dominance of airflow and the supplementary impacts of droplets. As the train’s operating speed ranged between 120 and 200 km/h and within a rainfall range of 20–100 mm/h, the safe operating region of trains decreased by 0.56%–7.03%, compared with the no-rain condition (0 mm/h). Originality/value The impact of crosswind speeds and rainfall on the train’s aerodynamic safety is studied, including the flow feature of crosswind and different particle-sized raindrops around the train and viaduct, aerodynamic loads coefficients suffered by the intercity train as well as the operating safety region of intercity trains on the viaduct.

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“…Under the knowledge that how crosswinds affect the safety of high-speed train, scholars have undertaken a series of studies to mitigate this wind effect, including optimising the train shape (Chen et al , 2018; Chen et al , 2019b), building the windproof facilities (Xiang et al , 2015; Gu et al , 2020; Niu et al , 2022) and developing wind forecasting and warning systems (Tian, 2010; Tian, 2019). Among them, due to their economic advantages, ease of installation, reliability and effectiveness, windbreak walls are a very promising solution.…”

Section: Introductionmentioning

confidence: 99%

Impact of the windbreak transition on flow structures of the high-speed railway and mitigation using oblique structure and circular curve structure transition

Chen

Zeng

Hashmi

et al. 2023

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Purpose This paper aims to investigate the variations in the flow fields induced by transition regions in the windbreak structures between the flat ground and the cutting along a railway and to propose mitigation measures to improve the windproof ability of the windbreak. Design/methodology/approach The improved delayed detached eddy simulation method was used to simulate the impact of the windbreak transition on flow structures of the high-speed railway under different wind angles, and also the accuracy of the numerical results was validated with those of the wind tunnel test. Findings The results showed that the original windbreak transition region resulted in a dimensionless peak wind velocity of 0.62 and 0.82 for railway line-1 at wind angles of 90° and 75°, respectively, and the corresponding values were 0.81 and 0.97 for railway line-2. The flow structure analysis revealed the reason for the mismatched height in the transition region, and the right-angle structures of the windbreaks resulted in ineffective protection and sudden changes in the wind speed and direction. Two mitigation measures – oblique structure (OS) and circular curve structure (CCS) transition walls – were developed to reduce the peak wind speed. The OS provided superior protection. The peak value of dimensionless wind velocity was all less than 0.2 for OS and CCS. Originality/value The flow field deterioration mechanism induced by the inappropriate form of a windbreak transition at different wind angles was examined, and effective mitigation and improvement measures were proposed and compared with the original transition.

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Aerodynamic simulation of effects of one- and two-side windbreak walls on a moving train running on a double track railway line subjected to strong crosswind

Cited by 39 publications

References 54 publications

Flow characteristics and wind-sheltering performance of wind barriers with different diameters of holes on railway viaducts

Flow characteristics and wind-sheltering performance of wind barriers with different diameters of holes on railway viaducts

Influence of wind and rain environment on operational safety of intercity train running on the viaduct

Impact of the windbreak transition on flow structures of the high-speed railway and mitigation using oblique structure and circular curve structure transition

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