简化双山体风压干扰效应的数值模拟

Numerical Simulation of the Interference Effects of Wind Pressure on Double Hills

与平原地区相比,山区风场特性较为复杂,山体间的风压干扰效应不容忽视.针对二维简化的双山模型,采用CFD数值模拟的方法,计算了2座山间距W为0,30,60,90,120,150和200 m 7种工况下双山体的表面压力分布以及2座山之间的相互干扰效应.计算所得数据通过Matlab软件处理,并由Surfer软件绘制云图,结果表明:当山高为90 m,2座山间距为30~90 m时干扰效应显著,前山对后山的影响较大,最大干扰作用是单山体风压的8倍左右;对于坡度相同但高度不同的山体,该结论同样具有参考价值;2座山无间隔或间隔大于山高时,干扰现象不显著,可视作2个单山进行考虑.

Compared with plain areas,mountainous areas feature strong wind pressures and present more complex characteristics.The interference effects of wind pressure generated between the hills cannot ignored.This paper investigates the wind pressure distribution on the surface of mountains and wind-induced interference between two hills through the CFD numerical simulation of a simplified double-hill model.In the numerical simulation,seven different spacings W=0,30,60,90,120,150 and 200 m were designed for the model.The matlab software was used to process the calculated data and the Surfer software was used to generate a cloud map.The results show that when the hill heights are 90 m,the distance between the two hills is 30~90 m,the interference effects are prominent and the wind from the front hill has a greater interference on the back hill.The maximum interference factor is about 8 times the wind pressure of a single hill.This conclusion is also of a reference value for hills with the same slope but different heights.When the spacing between two hills can be ignored or when the spacing is greater than the hill heights,the interference is not prominent,and the two hills can be considered as a single hill.