单山和双山风场特征的CFD数值模拟

采用CFD模拟方法研究单山和双山情况下三维山丘风场，研究计算模型表面粗糙度对风场的影响，计算不同坡度山体情况下单山的风场，进行两个山体左右排列情况的风场计算，分析坡度、风向角、间距对双山风场的影响.研究表明：山体的计算模型表面粗糙度增大时，山顶上方半山高度的加速效应减弱，山后尾流区的高度增加；山体横风切面的加速效应大于顺风切面，横风切面内半山以上的位置均为风速最大值区域；左右双山紧贴排列情况下，风斜吹时前山山顶的加速比大于后山山顶，风直吹的数据在两者中间.
CFD numerical simulation method was employed to study the wind field characteristics of three-dimensional hills under isolated hill and two adjacent hills condition. The influence of the calculation model surface roughness on the wind field was studied. The wind fields on isolated hill with different slopes were calculated. The wind fields of two adjacent hills in left-right arrangement were also investigated, and the influence of the hill slope, wind azimuth and hill distance on the wind field was studied. The results show that, if the model surface roughness increases, the speedup effect of half hill height above the top of the hill decreases and the height of vortex region increases. The speedup effects on the cross-wind plane of an isolated hill are more significant than those on the along-wind plane, and the most unfavorable position ranges from the half hill height to the top of the hill on the cross-wind plane. When two adjacent hills are in left-right arrangement with zero distance, the speedup ratios on the front hill are larger than those on the rear hill under yawed azimuth, and the speedup ratio, when wind blows perpendicularly to the two hills, is between these two data.