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Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

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

pages 301-306
DOI: 10.1615/TSFP2.500
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RESUMO

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.

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