To determine the suitable mounting location and height of the roof-mounted wind turbine, the turbulence characteristics over eight horizontal aspect ratio cuboid buildings were simulated via the computational fluid dynamic（CFD）method, in which the horizontal aspect rate are 0.25, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80 and 0.90, respectively. The results show that when horizontal aspect ratio increases and the cross-sectional shape of a cuboid building becomes closer to the square,the larger area of low wind speed at the top of the building,and the wind speed increases more slowly with height, while the wind speed recovers fastest at the windward corner. At the same time, the turbulence intensity increases due to the increase of stagnant fluid at the top of the building, and the area of turbulence intensity greater than 20%, the turbulence intensity at the leewardside and leeward inflection point is the highest. The smaller the horizontal aspect ratio is, the lower the suitable height for wind turbine installation is lower, for example, when the aspect ratio is 0.25, the minimum installation height is 1.12H; when the horizontal aspect ratio is 0.9, the minimum installation height is 1.20H; For cuboid buildings with different horizontal aspect ratios, the starting height of wind acceleration on the windward side of the roof is generally lower than that on the leeward side, which is more conducive to the installation of wind turbines.
Key words
wind turbines /
buildings /
turbulence intensity /
wind speed /
micrositing
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