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ISSN オンライン: 2642-0554

CIRCULATION TIME HISTORY AND ONSET OF THREE-DIMENSIONAL VORTEX SHEDDING IN THE WAKE BEHIND A DISK

Hiroshi Higuchi
Department of Mechanical, Aerospace and Manufacturing Engineering, Syracuse University, Syracuse, New York 13244-1240, USA

Helene Balligand
Dept. of Mechanical, Aerospace and Mfg. Engineering, Syracuse University Syracuse, New York, USA 13244

要約

The development of the wake vortex behind a disk started near-impulsively from rest was investigated with flow visualization and the particle image velocimetry. The circulation growth behind the near-impulsively started disk was found to scale with the non-dimensional time Uot/D (Uo constant disk velocity, t time, D diameter) for Reynolds numbers ranging from 3,100 to 12,400. The normalized circulation reached a maximum value of Γ/UoD=2.5 at a time approximately equal to 4, after which the vortex ring deformed and subsequently shed. The results are compared with the two-dimensional counterpart as well as computations.