Application of computational fluid dynamics CFD in livestock housing
Release time:
2024-11-29 18:39
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In recent years, the application of computational fluid dynamics (CFD) to simulate environmental distribution in livestock housing has become more and more common. CFD technology is an effective and feasible method that allows us to intuitively see the airflow changes in the house. Sourabh et al. conducted a numerical study of the airflow in a chicken house to compare two ventilation system options and the transmission characteristics of epidemic diseases. The paper mainly used CFD simulation to analyze the airflow inside and outside the house. The transmission of virus particles was simplified and assumed to be a tracer gas (NH3), and the influence of the thermal plume generated by the chickens in the laying house was also considered. By comparing two ventilation system schemes with opposite airflow directions, the results show that the bottom-up airflow system is more effective than the top-down airflow system. Daniella et al. evaluated an existing mechanically ventilated broiler house and used CFD technology to analyze and study the position and number of exhaust fans in the ventilation system. In addition, Blanes, Lnbok L, Kwon, etc. used CFD technology to evaluate the ventilation system in the chicken coop and simulated the air flow distribution. Li Wenliang, etc. used CFD technology to simulate the influence of the installation height, opening angle and air inlet wind speed of the rectangular air inlet damper in the closed flat chicken coop on the air flow distribution in the coop. The results showed that the installation height of the air inlet was different, and the opening angle of the damper was also different, resulting in a certain difference in the width of the jet. Zhai Yaofang et al. used numerical simulation to study the airflow organization and thermal and humid environment in a closed cage-type laying hen house. Here, the single-row cage and its chicken body were simplified into cuboids with the same resistance characteristics in different directions, and a porous medium model was set up. Wang Xiaoshuai et al. used CFD technology to evaluate and analyze the thermal and environmental quality of the laying hen house, and to optimize the structural design of the laying hen house. In the study, the authors explained in detail the numerical simulation problems in the laying hen house, including modeling, meshing, and determining boundary conditions. The results of this study provide an effective analysis method for simulating the thermal environment of livestock and poultry houses, as well as a theoretical basis and guidance for the rational design of ventilation systems and cooling systems in livestock and poultry houses.
Similarly, the use of CFD technology to study the environment in pig and cattle barns is also becoming more and more sophisticated. Bernardo et al. used CFD to redesign and evaluate the ventilation system in a pig barn and verified it in a field test. He Cheng et al. used a pig barn as the research object and based on CFD, carried out environmental numerical simulations of the airflow field and temperature field in the barn, providing a theoretical basis for the design of pig farms in China. Deng Shuhui et al. conducted CFD simulations of the air flow field and temperature and humidity field in a low-roofed cross-ventilation barn, proposed an optimization design method for the LPVC barn environment and carried out empirical verification, providing a theoretical basis and technical support for the renovation and environmental control of LPVC barns in China. It can be seen that the analytical application of CFD technology in livestock and poultry barns is becoming more and more common.
In summary, the environment of pigsties is becoming more and more complex, and environmental control is becoming more and more important. Environmental control has become an important part of large-scale farming production technology. Numerical simulation based on computational fluid dynamics (CFD) is an important method for studying the built environment. Because it can obtain the environmental distribution of airflow fields, temperature fields, pressure fields, etc. in the three-dimensional space of building facilities, and the simulation results can be visualized, CFD simulation has the advantages of being intuitive, low-cost, and short in time compared to other research methods. Therefore, it is being used more and more widely in fields such as civil and agricultural buildings.