Evaluation of wind pressure acting on multi-span greenhouses using CFD technique, Part 1: Development of the CFD model

Kim, Rack-woo; Lee, In-Bok; Kwon, Kilsung

doi:10.1016/j.biosystemseng.2017.09.008

Cited by 52 publications

(41 citation statements)

References 25 publications

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“…Moreover, the cost analysis demonstrated that the strengthening of a greenhouse structure is a very advantageous solution, as the construction cost is low, and it does not interrupt crop production. Another approach could be the evaluation of wind loads with advanced wind models [17] or Computational Fluid Dynamics (CFD) models [18][19][20][21] which may lead to less conservative wind pressures than the requirements of EN13031-1 [1] and, thus, more meticulous design and retrofitting methods.…”

Section: Discussionmentioning

confidence: 99%

Strengthening Techniques for Greenhouses

Maraveas

Tsavdaridis

2020

AgriEngineering

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Steel greenhouse structures are generally constructed by individual sole contractors using quick empirical structural calculations (pre-engineered solutions). It is also common to import standard greenhouses from other countries, mainly from The Netherlands, Italy, and France, and sometimes from Great Britain and Israel. Evidently, these countries differ concerning the local wind and snow conditions. Therefore, there is a need for a better design of structures accepted as satisfactory, while installation can be done in a different location. Many greenhouse structures incorporating poor designs or inappropriate pre-engineered solutions are currently in use. At the same time, demolition and reconstruction represent a very expensive solution considering the loss of crop production and the demolition and construction costs; thus, strengthening is a reasonable alternative. This paper presents strengthening techniques for steel greenhouses that are code-deficient according to EN 13031 and Eurocodes. Consequently, two case studies are presented as typical applications of greenhouse structure strengthening.

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Section: Discussionmentioning

confidence: 99%

Strengthening Techniques for Greenhouses

Maraveas

Tsavdaridis

2020

AgriEngineering

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“…In order to secure the structural safety of greenhouse built on coastal reclaimed land, the Cp values of five typical greenhouses used in Korea (1-2W, even-span, three-quarter, peach and mono-span type) were obtained by Ha et al [47] and Kwon et al [48] . These results were also used for validating the accuracy of the computational fluid dynamics (CFD) models developed by Kim et al [49] . The comparison between wind tunnel experiments and numerical results demonstrated that the CFD technique could for estimate the Cp values of greenhouse accurately.…”

Section: Wind Tunnel Experimentsmentioning

confidence: 99%

“…It has to be mentioned that these models used above were two-dimensional, while the turbulent behavior and wind direction were highly three-dimensional. In order to improve the accuracy of simulation, Kim et al [49] developed three-dimensional numerical models to estimate the Cp values of multi-span greenhouses with consideration of the various environmental conditions. It was found that the results obtained by two-dimensional numerical model were conservative at the leeward side of greenhouses due to the three-dimensional flow.…”

Section: Numerical Simulationmentioning

confidence: 99%

Wind pressure acting on greenhouses: A review

Nan¹,

Wang²,

Bai³

et al. 2021

International Journal of Agricultural and Biological Engineering

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Greenhouses are widely used in agricultural and horticultural production. With the characteristics of lightweight, small stiffness and high flexibility, greenhouses are sensitive to wind loads. In the calculation of wind loads, the wind pressure coefficient (Cp) is essential. The rationality of the value directly affects the safety and economy of greenhouses. Therefore, the Cp values estimation is one of the most important issues in the design of greenhouses. In order to make full use of the existing research results, in this study, three main methods for estimating Cp values were analyzed, namely, full-scale field experiment, wind tunnel experiment and numerical simulation. Five factors influencing the Cp values were then reviewed including greenhouse design parameters, greenhouse group, overhanging eaves, ventilation and wind direction. Based on the existing researches, suggestions for future development and research work were also put forward. Owing to the flexibility and deformability of greenhouses, the fluid-solid coupling method should be used to analyze the effects of vibrations on wind pressures. The interaction of building parameters (such as the number of spans, ridge height, roof shape and slope angle) and terrain around the greenhouse should be taken into consideration comprehensively. The destructive vortices occurred on the greenhouse should be further investigated.

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“…e critical wind speeds at which damage occurs on the surfaces of single-span plastic and solar greenhouses have been determined. e wind direction, spacing, and span of a greenhouse can influence the wind pressure distribution on the surface of greenhouses [6,9,10]. Maximum positive or negative pressure may cause the collapse of the greenhouse frame.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Analyses of Plastic Greenhouse Structure considering Fluctuating Wind Load

Jiang

Bai

Wang

et al. 2021

Advances in Civil Engineering

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Wind load is one of the main factors of plastic greenhouse collapse. To solve the dynamic response problem of greenhouses under wind load and determine the dangerous section of a skeleton structure, the investigated lump method is presented for the dynamic response analysis of a plastic greenhouse, considering pulsating wind on the basis of Timoshenko beam theory. First, the investigated lump is designed according to the Timoshenko beam microbody concept. On the basis of Timoshenko beam theory, the governing equations of the skeleton structure of the greenhouse are derived, and the realization process of the algorithm is also provided. Second, the accuracy and effectiveness of the proposed numerical method are verified by an example in which the bending wave of a variable cross section beam with free ends propagates. Finally, the dynamic response of the steel skeletons of plastic greenhouses is analyzed under the effect of the simulation wind speed, and the spatial distribution of the maximum node displacement and the section maximum stress of the steel skeleton are obtained. Computational results show that the displacement peak is near the top of the plastic greenhouse. The most dangerous section of the top chord in the steel skeleton is near the leeward bottom, which has a maximum stress of 219.4 MPa, and the most dangerous section of the bottom chord is near the 1 m height on the leeward side of the plastic greenhouse, which has a maximum stress of 248.5 MPa. Bending stress is the main factor of the rapid increase of stress at the bottom of the skeleton. The maximum node displacement and cross-sectional stress caused by fluctuating wind loads are higher than those caused by average wind loads. The fluctuating wind load should be considered in the wind-induced response analyses of plastic greenhouses.

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Evaluation of wind pressure acting on multi-span greenhouses using CFD technique, Part 1: Development of the CFD model

Cited by 52 publications

References 25 publications

Strengthening Techniques for Greenhouses

Strengthening Techniques for Greenhouses

Wind pressure acting on greenhouses: A review

Dynamic Response Analyses of Plastic Greenhouse Structure considering Fluctuating Wind Load

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