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Analysis of Wind Pressure Coefficients for Single-Span Arched Plastic Greenhouses Located in a Valley Region Using CFD

文献类型： 外文期刊

作者： Liang, Zongmin 1 ; He, Guifeng 1 ; Li, Yanfeng 2 ; Gao, Zixuan 1 ; Ren, Xiaoying 1 ; Wu, Qinan 3 ; Zhao, Shumei 1 ; Xu, Jing 1 ;

作者机构： 1.China Agr Univ, Coll Water Resources & Civil Engn, Beijing 100083, Peoples R China

2.Coll Agr & Anim Husb Tibet Autonomous Reg, Vegetable Res Inst, Lhasa 851418, Peoples R China

3.Tibet Acad Agr & Anim Husb Sci, Lhasa 851418, Peoples R China

关键词： valley topography; plastic greenhouse; wind pressure coefficient; computational fluid dynamics; calculation model

期刊名称：AGRONOMY-BASEL （ 影响因子：3.7； 五年影响因子：4.0 ）

ISSN：

年卷期： 2023 年 13 卷 2 期

页码：

收录情况： SCI

摘要： The wind pressure coefficient is essential for calculating the wind loads on greenhouses. The wind pressure on single-span arched greenhouses built in valleys differs from those in plain regions. To promote our understanding of wind characteristics and ensure the structural safety of greenhouses in valley areas, an analysis of the distribution law of wind pressure on greenhouses is required. Firstly, we carried out a survey on greenhouse distribution and undulate terrain distribution near greenhouses in Tibet and measured the air density in Lhasa, Tibet. Then, employing the validated realizable k-epsilon turbulence model and the verification of grid independence, the wind pressure on greenhouses with different greenhouse azimuths was investigated. According to the survey results, values, such as the distance between the greenhouse and the mountain in addition to the greenhouse azimuth, were also obtained for calculating the wind pressure on greenhouses placed in valleys. A calculation model considering the relationship between the mountain distance and the wind pressure coefficient is proposed, whose results fit well with the results from computational fluid dynamics. The relative errors between the two different results are within 15%. Research shows that there is a canyon wind effect in the valley area, and its effect on wind pressure should be considered in greenhouse design. This research is valuable for the design of plastic greenhouses built in Tibet or other valley regions.

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