Evaluation of wind pressure coefficients of single-span greenhouses built on reclaimed coastal land using a large-sized wind tunnel

Kwon, Kilsung; Kim, Dongwoo; Kim, Rack-woo; Ha, Tae Yong; Lee, In-Bok

doi:10.1016/j.biosystemseng.2015.11.007

Cited by 45 publications

(35 citation statements)

References 16 publications

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“…Fluid pressure and velocity are inversely related according to Bernoulli’s equation. Therefore, the higher inflow sewage velocity decreases the pressure coefficient by reducing fluid pressure in channel (Çengel and Cimbala, ; Kwon et al ., ). The pressure coefficient increases at the BB′ position because of the increase in fluid pressure caused by the decrease in liquid velocity.…”

Section: Resultsmentioning

confidence: 97%

“…The downstream pressure coefficient shows a similar pattern as that of the upstream with magnitude as the only difference. The pressure coefficient decreases in the downstream section because of the increase in liquid velocity (Kwon et al ., ). Furthermore, increasing the inlet flow rates significantly decreases the pressure coefficient or water pressure in the downstream section.…”

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

Numerical modeling of fluid–structure interaction between sewage water flow and bar screen to improve the screening process

Ali

Kim

Bang³

et al. 2018

Water & Environment J

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A self‐cleaning bar screen is often used in the first filtration level of a wastewater treatment plant to screen out solid debris from sewage water. The screening process of the bar screen was numerically investigated using the arbitrary Lagrangian–Eulerian method to model the fluid–structure interaction between the sewage water and bar screen. The bar screen design is improved by installing a rotating subscreen under the bar screen to prevent solid waste from passing through. The effects of bar screen on the water flow were examined using hydrodynamic properties. The structural properties were estimated to observe the effects of water flow on the parts of the bar screen. Various inlet flow rates and positions of subscreen and rake were used to examine their effects on velocity, pressure coefficient, structural deformation and von Mises stress. The screening process decreased with the increase in sewage flow rates. The water flow significantly affected the bar screen when the subscreen and rake are not in contact.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Numerical modeling of fluid–structure interaction between sewage water flow and bar screen to improve the screening process

Ali

Kim

Bang³

et al. 2018

Water & Environment J

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“…To verify the accuracy of fluid dynamics analysis, the pressure coefficients obtained through experiments [24] and the analysis of a single-span greenhouse with the dimensions provided in Table 1 are compared as shown in Figure 6. As shown in this figure, the experimental and analysis results are in good agreement, with a correlation coefficient of 0.99.…”

Section: Resultsmentioning

confidence: 99%

Fatigue Analysis of Greenhouse Structure under Wind Load and Self-Weight

Hur

Kwon

2017

Applied Sciences

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Abstract:The design strength of a greenhouse structure is generally determined by analyzing strength after applying wind load using the wind pressure coefficient according to a design guide. Until now, the stability analysis for wind load has been performed through static structural analysis. However, a greenhouse is subjected to dynamic wind loads of various amplitudes, and it is reasonable to judge stability through fatigue analysis. For fatigue analysis, a stress-normalized model was constructed based on the square of wind speed, and the value obtained by squaring wind speed was used as dynamic load time data. Life cycle was calculated under stress generated by self-weight by compensating fatigue estimation stress. Furthermore, the effect of self-weight was examined and errors of up to 21% were obtained depending on the configuration of the stress-normalized model. When self-weight and wind speed were applied simultaneously, the effect of self-weight reduced when the stress-normalized model was used at high wind speed. Therefore, it is appropriate that the fatigue analysis is based on the fatigue stress model normalized by the square of wind speed, fatigue estimation stress is corrected to the static stress due to self-weight, and the square of wind speed is used as the dynamic load.

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“…It has been observed that almost all greenhouses have undergone a three-dimensional collapse. Accordingly, there have been some attempts of making strong greenhouses by adding parts or changing the shape [5,6]. However, these methods are very expensive.…”

Section: Introductionmentioning

confidence: 99%

Estimate of rigidity of greenhouses made of steel pipes

Ban¹,

Hira²,

Ouchi³

et al. 2016

WIT Transactions on the Built Environment

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Greenhouses in Japan are usually made of steel pipes and plastic films. A greenhouse comprises arch and straight pipes. The structure is simple, and the construction cost is reasonable. However, typhoons and other disasters have caused considerable damage involving collapse of many structures, including greenhouses. This was caused by the lack of structural strength because of its simplicity. Snows and storms have only brought minor damages in the Nara prefecture until recent years. However, the number of incidents causing damage has been increasing because of the abnormal weather. Therefore, the farmers in the Nara prefecture need strong greenhouses. The basic greenhouse model is the two-dimensional structure of the arch pipe. Some studies conducted stress analysis on this two-dimensional structure. It has been observed that almost all greenhouses have undergone a three-dimensional collapse. This research proposes a new trussbased structure; structural design was conducted using a three-dimensional model. We focused on the rigidity and attempted to analyse the eigenvalues for both the new structure and the conventional one. Consequently, the number of eigenmodes in the new structure was found to be less than the number of those in the conventional one between 0 Hz and 10 Hz. We consider that the numbers of eigenmodes were transferred to a higher frequency range. The new structure showed good resistance to collapse by resonance.

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Evaluation of wind pressure coefficients of single-span greenhouses built on reclaimed coastal land using a large-sized wind tunnel

Cited by 45 publications

References 16 publications

Numerical modeling of fluid–structure interaction between sewage water flow and bar screen to improve the screening process

Numerical modeling of fluid–structure interaction between sewage water flow and bar screen to improve the screening process

Fatigue Analysis of Greenhouse Structure under Wind Load and Self-Weight

Estimate of rigidity of greenhouses made of steel pipes

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