Second Symposium on Turbulence and Shear Flow Phenomena
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
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.