連立する建物まわりの流れと作用風力

Abstract

In order to investigate the mechanism of the interference effects of twin tall buildings withsquare sections in a low turbulent boundary layer, the flow visualization around them and themeasurements of the mean and fluctuating wind forces acting on the downstream building werecarried out.The mean wind force acting on the downstream building was found to be decreased com-pared to that of the isolated building because the mean velocity of the approaching flow was re-duced due to the shielding effects from the upstream building. On the other hand, the fluctuatingforce on the downstream building showed more than twice as large as that of the isolated build-ing in case that I ) the vortices produced by the upstream building and the flow surroundingthem control the flow between the two buildings (named the 'switching effect') or ii) a pair vor-tices produced by both buildings are synchronously and periodically shed in the contracted flowregion between the two buildings.