Summary of best guidelines and validation of CFD modeling in livestock buildings to ensure prediction quality

Rong, Li; Nielsen, Peter; Bjerg, Bjarne; Zhang, Guoqiang

doi:10.1016/j.compag.2015.12.005

Cited by 101 publications

(55 citation statements)

References 68 publications

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“…The realizable kε turbulence model were used in CFD simulation since kε turbulence model was widely used in the literature to study the indoor flow and environmental parameters for livestock (Norton et al, 2007), and the realizable kε turbulence model had improvements on the prediction for flow rotation, recirculation and boundary separation (Rong et al, 2016) which were expected in this study. Furthermore, standard wall functions were applied to the model with special attention paid to the parameter of y * since for high…”

Section: Turbulence Model and General Settingsmentioning

confidence: 68%

“…According to Roache (1994), for unstructured mesh h 1 and h 2 is the grid number of fine and coarse mesh respectively while for structure mesh h 1 and h 2 is the representative grid size of fine and coarse mesh respectively. F s is factor of safety equal to 3 based on Rong et al (2016)'s study. P denotes the numerical scheme order of accuracy, which is 2 for second order scheme.…”

Section: Grid Convergence Studymentioning

confidence: 99%

“…It is noted that quantify and determine the boundary conditions for an animal house could be a difficult task. According to related studies in the literature (Blanes-Vidal et al, 2008;Rojano et al, 2016;Rong et al, 2016;Bustamante et al, 2017), the general way to define the boundary conditions used in numerical study is based on experimental measurements at limited positions, which is considered to be appropriate and best possible approach. Therefore, in present study, the suspended ceiling, the floor, 2 side walls, the end and front walls were represented isothermally at a constant temperature calculated from the mean value of the surface temperature measurements as shown in Table 5.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…Reynolds number kε model, standard wall function are effective only when 30 < y * < 300. Readers could refer to reference (Rong, 2016) for more detailed information about wall functions. It was assumed that the CFD simulation was an incompressible, turbulent, 3-dimensional steady flow.…”

Section: Turbulence Model and General Settingsmentioning

confidence: 99%

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Computational Fluid Dynamics aided investigation and optimization of a tunnel-ventilated poultry house in China

Yang

Dominy

et al. 2019

Computers and Electronics in Agriculture

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Ventilation system is crucial for poultry houses to control the indoor climate and air quality. The tunnel ventilation system is widely applied for large-scale poultry buildings in China but only limited scientific researches regarding the flow pattern, temperature distribution and design criteria are available in the literature. Thanks to the fast development of computer technology, Computational Fluid Dynamics (CFD) techniques were used in present study to investigate the indoor air movement, air temperature and relatively humidity. A three-dimensional CFD model was built according to the real dimensions of a laying hen house and the model was validated by comparing the simulation results with the field measurements at 30 positions. Meanwhile, statistical analysis was performed to determine the differences between different boundary conditions regarding the agreement between measured and CFD simulated results. Optimization of air inlet configurations was performed by using the validated CFD model and it was found that the uniformity of indoor air movement could prevent excessive local convective heat losses and reduce the temperature at the end of the house. Furthermore, the air inlets placed at the middle of the side wall could significantly reduce the high temperature expected at the end of the building without using extra energy, which is especially important for large-scale poultry farms with long buildings.The performance of side-wall windows was also examined and preliminary guidance was provided to effectively regulate the indoor climate by using these windows with the help of environmental monitoring systems. The present study contributes to the understanding and design of the tunnel ventilation system used in poultry houses.

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Section: Turbulence Model and General Settingsmentioning

confidence: 68%

Section: Grid Convergence Studymentioning

confidence: 99%

Section: Boundary Conditionsmentioning

confidence: 99%

Section: Turbulence Model and General Settingsmentioning

confidence: 99%

See 2 more Smart Citations

Computational Fluid Dynamics aided investigation and optimization of a tunnel-ventilated poultry house in China

Yang

Dominy

et al. 2019

Computers and Electronics in Agriculture

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“…where C µ is an empirical constant. This turbulence model was chosen due to its simple format and robust performance, and because of its favourable convergence behaviour and reasonable accuracy [33,34]. The realizable and the standard K-ε turbulence model were both simulated: it was observed that the simulated results were very close to each other, so the second one was chosen due to it having lower computational costs.…”

Section: (B) Turbulence Modelmentioning

confidence: 99%

Development of a CFD Model to Simulate Natural Ventilation in a Semi-Open Free-Stall Barn for Dairy Cows

et al. 2019

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Natural ventilation is the most common passive cooling system in livestock buildings. The aim of this research is to assess airflow distribution inside a free-stall barn for dairy cows by computational fluid dynamics (CFD) modelling and simulation. The model is validated by using the average values of experimental data acquired in a free-stall barn, which is considered relevant because it is located in a region characterised by hot climate conditions during the summer that could induce animal heat stress. Simulations are carried out in steady-state conditions, and simulated data are validated by the average values of air velocity measurements. Since the modelled air velocity distribution in the barn fits the real one well, the CFD model is considered reliable to simulate other conditions. The application of the proposed CFD model in the simulation of specific building design alternatives could be aimed at studying the related airflow distribution in order to find the best configuration.

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Modelling and Design of the Microclimate in Livestock Housing

Bjerg

2022

Encyclopedia of Smart Agriculture Technologies

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Summary of best guidelines and validation of CFD modeling in livestock buildings to ensure prediction quality

Cited by 101 publications

References 68 publications

Computational Fluid Dynamics aided investigation and optimization of a tunnel-ventilated poultry house in China

Computational Fluid Dynamics aided investigation and optimization of a tunnel-ventilated poultry house in China

Development of a CFD Model to Simulate Natural Ventilation in a Semi-Open Free-Stall Barn for Dairy Cows

Modelling and Design of the Microclimate in Livestock Housing

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