Abstract
For wind turbines, the site selection is important to utilize wind energy, because it depends strongly on wind speed. Wind assessment needs long term observation and high cost, especially for large wind turbines. Then, numerical analysis is often used for the site selection. However, the accuracy is not enough for complex terrains that are more common in Japan. The objective of this study is to improve the numerical analysis of winds on complex terrains by investigation of effects of surface roughness and steepness. This paper describes the experimental results of wind tunnel measurements of wind field on two-dimensional hill models which have various surface roughness and steepness with PIV system.
