Inverted Conical Vortices on the Side Walls of a Building with Vertical Fins

Abstract

Vertical fins attached to the wall of a building have been shown to occur peak wind force coefficients with absolute value exceeding 6.5 at the building edge and peak wind force coefficients with absolute values exceeding 3.5 at the general part of the building. From these results, it is possible that the mechanism of negative pressure occurrence is different because of differences in the vertical distribution of the wind force coefficients of the vertical fins at the building edges and in the general part of the building. Therefore, it is important to study the mechanism of wind load generation at each part for rational wind load evaluation. In this study, the mechanism of the peak wind force coefficients generated in the vertical fins of the general part was investigated associating with the LES based visualization. It was estimated that the reason for the absolute value of the minimum peak wind force coefficient to be larger in the middle and lower sections of the vertical fins in the general part was due to the generation of inverted conical vortices from the lower layers of the fin at the building edge.