温室外形对压力系数分布影响的数值研究

风荷载是影响温室耐久性的重要指标,而温室的荷载能力会受到温室形状的影响。利用标准k-ε模型对高、低两种尺寸的几种不同外形温室流场和顶部压力系数分布进行了数值模拟。结果表明,半圆形顶部的平均压力系数Cp、湍流脉动动能k值和尾部回流区均最小;同时尺寸较高的温室的顶部与较低尺寸的相比,其压力系数的波动和k值变化更大,应给予更高的结构强度设计。

Numerical study on effect of greenhouse shape on wind pressure coefficient

Wind load is an important factor that effects the solidity of greenhouses. The shape of their roofs will effect the structural strength and load-carrying capacity of greenhouses. Numerical simulations of flowfield and pressure distribution around various roofs in higher and lower dimensions were done with standard k-εmodel. The results showed that the average pressure coefficient Cp, turbulence kinetic energy k and recirculation zone of the semi-circular roof shape were all the most smallest. The fluctuation of pressure coefficient and the turbulence kinetic energy k around higher roofs was stronger than lower roofs. Therefore, harder structural strength should be designed for higher greenhouse.