The main Evaluation of CFD Accuracy for the Ventilation Study of a Naturally Ventilated Broiler
The main Evaluation of CFD Accuracy for the Ventilation Study of a Naturally Ventilated Broiler
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自然通风肉鸡通风研究CFD精度的主要评价
DOI：
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发表时间：
2006
期刊：
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通讯作者：
S. Sung
中科院分区：
文献类型：
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作者：
House In;S. Sase;S. Sung
利用CFD模型，在自然通风的鸡舍中，考虑到通风效率，如均匀性、稳定性和环境因素的适宜性，将会找到一个新的通风系统设计。由于进行通风研究的现场实验存在许多困难，因此必须开发一个可靠的三维计算流体动力学(CFD)模型来研究自然通风。在研究其准确性之前，首先进行了风洞和粒子图像测速(PIV)测试，以找出它们的最佳实验条件，并提高PIV的精度13，15。采用1/20比例的自然通风鸡舍模型，利用PIV和CFD定性和定量地获得了鸡舍内的气流分布。为了提高CFD计算的精度，对PIV和CFD计算的鸡舍内气流进行了比较，特别是对鸡舍内的分布、局部风速和湍流强度进行了比较。网格密度的质量和边界条件的设计，特别是风速和湍流剖面的设计，对于获得准确的结果是非常重要的。假设数值模拟结果是准确的，则采用RNGk-ε湍流数值模型得到的计算结果最为准确。采用RNGk-ε模型计算风速的平均误差为-6.2%。学科：农业设施附加关键词：空气动力学、计算流体力学、自然通风、粒子图像测速仪、风洞JARQ 41(1)、53-(2007年)http://www.jircas.affrc.go.jp本文报道了韩日联合项目“大型农业建筑最新空气动力学技术的结构设计与环境控制”所取得的成果。*通讯作者：传真：+81-29-838-7609；收到电子邮件：Sase@affrc.go.jp，2005年10月28日收到；2006年5月9日接受。
Using the CFD model, a new ventilation system design will be found later taking into consideration the ventilation efficiency such as uniformity, stability, and suitability of environmental factors in a naturally ventilated broiler house. Because conducting a field experiment for the ventilation study presented so many difficulties, a reliable 3-dimentional computational fluid dynamics (CFD) model had to be developed to investigate the natural ventilation. Before investigating its accuracy, a wind tunnel and particle image velocimetry (PIV) test was initially conducted to find their best experimental conditions and improve the PIV accuracy13,15. A 1/20 scale model of a naturally ventilated broiler house was used to get qualitative and quantitative airflow distribution in the broiler house using the PIV and CFD. To improve the CFD accuracy, the PIV and CFD computed airflows in the broiler house were compared, particularly on the distribution, local air velocity, and turbulent intensity in the house. The quality of the mesh density and the design of the boundary condition, especially the wind velocity and turbulence profiles, were found to be very important for getting accurate results. Assuming the PIV results were accurate, the most accurate CFD results were obtained when using a RNG k-ε turbulence numerical model. The average error of the CFD computed air velocity when using the RNG k-ε models was -6.2%. Discipline: Agriculture facilities Additional key words: aerodynamics, computational fluid dynamics, natural ventilation, particle image velocimetry, wind tunnel JARQ 41 (1), 53 – 64 (2007) http://www.jircas.affrc.go.jp This paper reports the results obtained in the Korea-Japan joint project on “Structural design and environmental control of large-sized agricultural buildings by latest aerodynamic techniques”. *Corresponding author: fax +81–29–838–7609; e-mail sase@affrc.go.jp Received 28 October 2005; accepted 9 May 2006.