AM06-03-013 2方向同時動画撮影による球後流の渦構造の解明(乱流渦構造(3),一般講演)

概要

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The process of vortex shedding was experimentally examined in the wake of a sphere for Re=1700〜20000 through flow visualization. Small scale vortices were continuously shed from the recirculation region at several high mode St numbers for Re≲7000. A low mode structure formed downstream of the recirculation region contained an integral number of the high mode vortices. Four types of the low mode structures existed. For Re≒1700〜2000, the low mode structures became a helical- or a staggered-type vortex arrangement. Staggered-type low mode structures of 2〜6 hairpin vortices and of 4〜6 ring-like small vortices were formed in turn irregularly for Re≒2400〜3800. Only the staggered-type structure of ring-like vortices was observed for Re≒3800〜7000. The low mode structure was basically the staggered-type for Re≳7000, though its inside changed to be turbulent through the mutual interaction among the high mode vortices.
日本流体力学会の論文
2006-09-05