Analysis of the efficiency of greenhouse ventilation using computational fluid dynamics

Mistriotis, Α.; Bot, G.P.A.; Picuno, Pietro; Scarascia-Mugnozza, Giacomo

doi:10.1016/s0168-1923(96)02400-8

Cited by 117 publications

(60 citation statements)

References 14 publications

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“…14b, which shows that the RSM and the standard k-ω models tend to overpredict the experimental values by up to 9 times (x/D = 0.6). Note that in several previous studies, authors pointed out the superior performance of the RNG k-ε model for indoor air flow modeling, especially compared to the standard k-ε model [41,50,64,71]. This is to a large degree confirmed by our study.…”

Section: Impact Of Turbulence Modelsupporting

confidence: 88%

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

Ramponi

Blocken

2012

Building and Environment

467

271

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• Extensive literature review on numerical cross-ventilation studies in overview table.• Detailed sensitivity analysis for CFD simulations of a cross-ventilated building model.• The SST k-ω turbulence model shows the best agreement with PIV measurements.• The turbulent kinetic energy strongly influences the convergence and the results.• The prediction of the outdoor standing vortex largely affects the indoor airflow. AbstractAccurate CFD simulation of coupled outdoor wind flow and indoor air flow is essential for the design and evaluation of natural cross-ventilation strategies for buildings. It is widely recognized that CFD simulations can be very sensitive to the large number of computational parameters that have to be set by the user. Therefore, detailed and generic sensitivity analyses of the impact of these parameters on the simulation results are important to provide guidance for the execution and evaluation of future CFD studies. A detailed review of the literature indicates that there is a lack of extensive generic sensitivity studies for CFD simulation of natural cross-ventilation. In order to provide such a study, this paper presents a series of coupled 3D steady RANS simulations for a generic isolated building. The CFD simulations are validated based on detailed wind tunnel experiments with Particle Image Velocimetry. The impact of a wide range of computational parameters is investigated, including the size of the computational domain, the resolution of the computational grid, the inlet turbulent kinetic energy profile of the atmospheric boundary layer, the turbulence model, the order of the discretization schemes and the iterative convergence criteria. Specific attention is given to the problem of oscillatory convergence that was observed during some of these coupled CFD simulations. Based on this analysis, the paper identifies the most important parameters. The intention is to contribute to improved accuracy, reliability and evaluation of coupled CFD simulations for cross-ventilation assessment.

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Section: Impact Of Turbulence Modelsupporting

confidence: 88%

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

Ramponi

Blocken

2012

Building and Environment

467

271

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“…These large local differences can be explained by the different direction of the incoming jet flow. Note that in the majority of the previous studies on cross-ventilation in buildings with asymmetric openings, the Sk-ε turbulence model was used for the CFD simulations [25,37,[39][40][41][42][43]45]. In addition, some studies were conducted using the RSM model (e.g.…”

Section: Impact Of Turbulence Modelmentioning

confidence: 99%

“…Finally, quite some studies focused on buildings with a pitched roof and asymmetric opening positions (group 4) (e.g. ( [37][38][39][40][41][42][43][44][45][46][47][48][49][50]). Within this group however, only one study considered a saw-tooth roof [45].…”

Section: Introductionmentioning

confidence: 99%

CFD analysis of cross-ventilation of a generic isolated building with asymmetric opening positions: Impact of roof angle and opening location

Perén

Hooff

Leite

et al. 2015

Building and Environment

159

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“…Kacira et al 5 studied the effect of side and roof vent configurations on air exchange rates of sawtooth greenhouse designs. Mistriotis et al 7,8 evaluated the efficiency of greenhouse ventilation with two-dimensional cases for Mediterranean-type greenhouses. Boulard et al 2,3 studied airflow distribution and ventilation characteristics of naturally ventilated greenhouses.…”

Section: Effects Of Side Vents and Span Numbers On Wind-induced Naturmentioning

confidence: 99%

Effects of Side Vents and Span Numbers on Wind-Induced Natural Ventilation of a Gothic Multi-Span Greenhouse

Kaçıra

Sase

Okushima

2004

JARQ

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In this paper, the effects of wind speed, side ventilators and span numbers on gothic type multi-span greenhouse natural ventilation were studied by numerical simulation using the Computational Fluid Dynamics (CFD) approach. The realizable k-ε model was used for the turbulence model in the simulations. The results showed that the maximum greenhouse ventilation rate was achieved when both side and roof vents were used for ventilation. Without the existence of buoyancy effect in the computations, it was found that the ventilation rate increased linearly with the external wind speed in all the cases studied. The ratio of the opening of the ventilator area to the greenhouse floor area, 9.6%, was found to be small compared to the recommended ratios of 15-25%. The results showed that a significant reduction in ventilation rate was determined as the number of spans was increased and an exponential decay explained the relationship between the ventilation rate and the number of spans.

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Analysis of the efficiency of greenhouse ventilation using computational fluid dynamics

Cited by 117 publications

References 14 publications

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

CFD analysis of cross-ventilation of a generic isolated building with asymmetric opening positions: Impact of roof angle and opening location

Effects of Side Vents and Span Numbers on Wind-Induced Natural Ventilation of a Gothic Multi-Span Greenhouse

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