Estimating the wind pressure coefficient for single-span greenhouses using an large eddy simulation turbulence model

Kim, Rack-woo; Lee, In-Bok; Yeo, Uk-Hyeon; Lee, Sang-yeon

doi:10.1016/j.biosystemseng.2019.10.009

Cited by 14 publications

(7 citation statements)

References 48 publications

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“…Despite the inherent limitations found in wind tunnel experiments, their relevance for the validation of numerical models is evidenced in studies, as the pressure coefficients of greenhouses with variations in the slope of flat roofs and curvature of arched roofs were evaluated (Kim et al, 2019b). Correlation coefficients from 0.79 to 0.98 were obtained for pitched roof greenhouses and a range from 0.82 to 0.95 for vaulted roof greenhouses from the analysis of the results of the large eddy simulation (LES) turbulence model in CFD modeling and from studies carried out in a wind tunnel (Kim et al, 2019b).…”

Section: Experimental Modelsmentioning

confidence: 99%

Advances in methodologies to assess wind actions in plastic-covered greenhouses

Soriano,

Shiguemoto,

Vieira Neto

2024

Sci. agric. (Piracicaba, Braz.)

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The technology provided by greenhouses is essential for protecting crops sensitive to bioclimatic adversities and for improving agricultural production indexes. However, the need to know the exact interaction between the flexible coating and the structure under wind action has motivated new studies. The objective was to perform an in-depth review of the scientific and technological advances regarding methodologies to obtain parameters related to wind actions that are essential for the structural safety of greenhouses. This study showed the relevance of experimental methods; however, the limitations of the study are diverse, as field experiments require the construction and modifications of a prototype, which demand time and financial resources. Experiments in wind tunnels with models on a reduced scale have contributed significantly, as it allows to control the wind flow; however, in plastic-covered greenhouses, discrepancies occur due to the impossibility to represent the aeroelasticity of the construction. Modeling via computational fluid dynamics (CFD) has proven to be a solution for extrapolating limitations in experimental methods by facilitating changes in the construction model and wind flow. In addition to pure turbulence models, studies on hybrid turbulence models (Scale-Resolving Simulation) must be deepened to obtain greater accuracy of pressure coefficients. The complexity of the subject and the need for new contributions to plastic-covered greenhouse projects are a reality, which outlines a promising horizon for research development in the rural construction sector.

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Section: Experimental Modelsmentioning

confidence: 99%

Advances in methodologies to assess wind actions in plastic-covered greenhouses

Soriano,

Shiguemoto,

Vieira Neto

2024

Sci. agric. (Piracicaba, Braz.)

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“…Incidents of high winds causing damage to solar greenhouse roofs and their supporting structures have intermittently occurred, leading to substantial economic losses and disruptions in normal production. Furthermore, such occurrences pose significant risks to the safety of personnel, underscoring the urgent need for enhanced structural resilience measures [4][5][6]. Addressing these vulnerabilities is imperative to mitigate economic impact and ensure the safety and continuity of operations within solar greenhouse facilities.…”

Section: Introductionmentioning

confidence: 99%

Study of Wind Field and Surface Wind Pressure of Solar Greenhouse Group under Valley Topography Conditions

Gao,

Xu,

Wang

et al. 2024

Agronomy

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There is a wind interference effect between greenhouses in a group arrangement of solar greenhouse groups. To ensure the structural integrity of greenhouse groups situated in valleys, it becomes imperative to analyze both the wind pressure distribution patterns and the wind interference effects. This arises from the recognition that the wind load coefficients applicable to solar greenhouse groups nestled within valleys deviate from those observed in flat plains. The application of the contour modeling method facilitated a realistic reconstruction of the authentic topography within the study area. Subsequently, a wind field simulation was executed specifically for the constructed valley. The resultant wind field data for the studied valley area were then obtained. In the valley, nine solar greenhouses were systematically arranged in a three by three configuration. Special attention was directed towards assessing the surface wind pressures derived meticulously from the simulated wind field and wind direction angle of 0°. The findings elucidate the following: (a) The wind speed ratio exhibits a diminution on the leeward side of the mountain as compared to the windward side, with a notably reduced wind speed ratio observed in proximity to the mountain. (b) An amplification effect is discernible in the peripheral zone adjacent to the leading row of greenhouses, proximate to the incoming airflow. Particular emphasis is warranted regarding the reversal of wind direction observed in the secondary row of greenhouses positioned along the north wall and front roof, specifically at a wind angle of 0°, owing to the pronounced influence of interference effects. Hence, when undertaking the design and construction of a cluster of solar greenhouses within the valley terrain of Tibet, meticulous consideration must be directed towards both the meticulous calculation of wind loads within the periphery of the greenhouses and the judicious selection of the grouping’s location.

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“…Liu et al 13 studied the wind load effect on a structure with a large span and employed wind tunnel test results and field measuring. Using wind tunnel tests, Kim et al 14 obtained wind pressure coefficients on single-span greenhouses. Hu et al 15 investigated the uplift effect due to the wind load effect on the storage tank and studied the buckling effect on tank shells.…”

Section: Introductionmentioning

confidence: 99%

Wind effect on scallop domes with negative amplitude and prominence using Experimental and Numerical Study

Nejati

Sadeghi

Heristchian

2023

International Journal of Space Structures

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This study investigates the wind effect on hexa-sectored scallop domes using Computational Fluid Dynamics (CFD) and wind tunnel tests. Similar to the shape of a seashell, the scallop dome is one of the most common domes used to cover large spans. The scallop dome has an additional curvature equal to its sectors compared to a base dome (spherical). Hence, it has better structural efficiency compared to a spherical dome under the same condition. The curvatures on the scallop dome create alternate “ridges” and “grooves” on it. According to the computations of the article, the grooves created on this dome in the sector, as well as their position angle to the wind direction significantly affect pressure coefficient value. Due to these differences, wind pressure on scallop domes significantly differs from wind pressure on spherical domes. The results indicate that the ridges cause negative wind pressure coefficients whose magnitude reaches a maximum of −2.0 for an angle of alignment of 30°. The analyses have been conducted through Ansys-Fluent. This study presents the equation of wind pressure coefficient in the most critical of dome groove positions. The arch created between the grooves of a scallop dome is another effective parameter on maximum negative pressure. In the case study scallop dome, if the wind effect angle is considered α = 15, the maximum deformation in the structure will be created, which is 20% higher than that of α = 0.

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Estimating the wind pressure coefficient for single-span greenhouses using an large eddy simulation turbulence model

Cited by 14 publications

References 48 publications

Advances in methodologies to assess wind actions in plastic-covered greenhouses

Advances in methodologies to assess wind actions in plastic-covered greenhouses

Study of Wind Field and Surface Wind Pressure of Solar Greenhouse Group under Valley Topography Conditions

Wind effect on scallop domes with negative amplitude and prominence using Experimental and Numerical Study

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