Reproduction on LES with numerical weather prediction model of gust factor

Abstract

We discuss behavior of gust factor in the real atmospheric surface layer predicted by using large-eddy simulations with a numerical weather prediction model in detail. The grid resolutions are set at 5.6m. The relationship between gust factor and averaging time corresponded to the Durst curve. The relationship strongly depended on the existance of -2/3 slope region in power spectra of wind speed fluctuation, and also coherence structures, such as streaky structures.