温室结构风压的CFD模拟

CFD simulation of wind pressure on greenhouse structure

利用计算流体动力学 (computationalfluiddynamics ,CFD)软件CFX 5 ,采用湍流k ε模型和结构化非均匀网格对华南型单栋塑料温室的表面风压进行了数值模拟 ,预测出温室表面的风压分布 ,并讨论了温室屋檐和屋脊处的风压分布特点。与他人风洞试验结果进行比较结果表明 ,数值模拟和风洞实验的风压分布趋势相近 ,风压数值基本吻合。对连栋温室的表面风压进行了模拟 ,得到了表面风压的分布特征 ,并发现边缘栋的风压较大 ,在结构设计时应该重视 ;在连栋数大于 3栋的情况下 ,中间各栋温室的表面风压比较一致。CFD方法能定性和定量地预测出温室表面的风压分布。

A numerical simulation was carried out for wind load acting on the Southern-China type single-span greenhouse utilizing the CFD software CFX-5 with turbulent k-ε model and structured meshing, and predicted the wind pressure distribution on the surface of greenhouse, the characteristics of wind pressure distribution on the eaves and ridges of greenhouse was discussed. Comparison between the simulated results and that of wind tunnel experimental test by others shows that the trends of wind pressure distributions are similar and the corresponding pressure values are in general coincidence, suggesting that CFD technique can predict the wind pressure distribution successfully therefore it provides a powerful tool for simulating various load features both qualitatively and quantitatively. Furthermore, simulation of wind pressure distribution for a multi-span greenhouse was also studied, it shows that the marginal span endures much larger wind load whereas the middle ones endure less. Therefore attention should be taken for the marginal ones. When the number of spans is larger than 3 the wind loads on the middle ones are almost uniform.