This study investigated the wind conditions over a building from the viewpoint of mounting small wind turbines. Large-eddy simulations (LES) of the wind flow around a rectangular prism-shaped building, whose ratio of breadth, length, and height is 1:1:2, was performed. The LES results confirmed that above the vicinity of the building's leading edge, wind power density is relatively large and velocity standard deviation is relatively small. It was also confirmed that the regions with higher values of standard deviation of the stream-wise wind velocity component that exceeds the value given by IEC61400-2 for the normal turbulence model are large.
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