NUMERICAL STUDY OF WIND VELOCITY MEASURED ON THE ROOFTOP OF A TALL BUILDING IN CITY

Abstract

The measurement wind velocity on the rooftop of the tall building is usually utilized as a reference wind velocity. However, after many new tall buildings have been constructed around the specified tall building, it becomes difficult to use the rooftop data as a reference. While, the wind velocity predicted by the meso-meteorological model (MM5) without the urban-canopy model has been little affected by surface shapes of buildings on the ground and expected to be accurate at sufficiently higher position. This paper examines the regional representativeness of MM5 wind velocity data by comparing the full-scale measurement data at open area. Also, in the case of measurement point within the urban canopy, rooftop wind velocity computed by large-eddy simulation (LES) is estimated by matching MM5 wind profile. The method determining an appropriate height for a reference wind velocity is provided.