Electronic Resource
New York, NY
:
American Institute of Physics (AIP)
Physics of Fluids
5 (1993), S. 1854-1856
ISSN:
1089-7666
Source:
AIP Digital Archive
Topics:
Physics
Notes:
There has been some question recently as to whether the far-wake structure of a bluff body is dependent on, or "connected'' with, the precise details of the near-wake structure. Indeed, it has previously been assumed that there is no direct connection in scale or frequency. In the present work, observations are shown of a honeycomb-like 3-D pattern in the far wake, which is caused by an interaction between the decaying oblique shedding waves from upstream and large-scale 2-D waves in the far wake. A clear "connection'' between the 3-D scales of the near and far wakes is thereby demonstrated. The symmetry and spanwise wavelength of Cimbala et al.'s [J. Fluid Mech. 190, 265 (1988)] 3-D pattern are precisely consistent with such wave interactions. In the presence of parallel shedding, the lack of a honeycomb pattern shows that the pattern is clearly dependent on oblique vortex shedding. It also follows that for oblique shedding, the far-wake 2-D waves cannot possibly be the result of vortex pairing.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.858810
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