辺長比が小さい角柱の空力特性・空力不安定振動に関する数値的考察

概要

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It is well known that the critical depth section has the minimum base pressure and the maximum drag. In case of a shorter rectangular cylinder than the critical depth section, a different type of unstable oscillation called low-speed galloping can be recognized at the lower reduced velocity than resonant reduced velocity. In the present study we carry out three-dimensional numerical simulations of fluid flows around a stationary or an oscillating rectangular cylinder with shorter depth. In order to understand the physical mechanism of unstable phenomena, the numerical results are investigated by use of the visualization technique. Especially we pay attention to the behaviors of separated shear layers from the leading edges of a rectangular cylinder and the formation of vortices in the wake.
社団法人日本建築学会の論文
1998-05-30