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Conditional eddies in isotropic turbulence
Isotropic turbulence is examined for the existence of conditional flow structures by computing estimates of the velocity u(x+r, t) given that the velocity at (x, t) assumes some specified value, u(x, ...

Spectral characteristics of vortex breakdown flowfields

Phys. Fluids 22, 2053 (1979); doi:10.1063/1.862514

Issue Date: November 1979

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A. K. Garg and S. Leibovich
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853
Laser-Doppler anemometer measurements upstream and in the wakes of vortex breakdowns of bubble and spiral types are described. Spectral analysis of the data indicates prominent oscillations in the wakes at less than 10 Hz. These oscillations correspond closely to theoretical predictions of the linearly most unstable normal modes of the time-averaged mean flow profiles. The oscillations are more energetic, and vortex core expansions are greater for flows with a bubble form of vortex breakdown, which is therefore regarded as the stronger form of breakdown. Physics of Fluids is copyrighted by The American Institute of Physics.
Permalink: http://dx.doi.org/10.1063/1.862514
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KEYWORDS and PACS

Keywords
PACS
  • 47.20.+m
    Fluid dynamics Hydrodynamic stability
  • 47.30.+s
    Fluid dynamics Rotational flow and vorticity
  • YEAR: 1979

PUBLICATION DATA

ISSN:
0031-9171 (print)   1089-7666 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (10)
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  1. J. H. Faler and S. Leibovich, Phys. Fluids 20, 1385 (1977).
  2. J. H. Faler and S. Leibovich, J. Fluid Mech. 86, 313 (1978).
  3. S. Leibovich, in Annual Review of Fluid Mechanics (Annual Reviews, Palo Alto, California, 1978), Vol. 10, p. 221.
  4. M. Lessen, P. J. Singh, and F. Paillet, J. Fluid Mech. 63, 753 (1974).
  5. P. I. Singh and M. S. Uberoi, Phys. Fluids 19, 1858 (1976).
  6. D. K. Kreid and D. S. Eowe, Ann. Opt. 15, 321 (1976).
  7. A. K. Garg, M.S. thesis, Cornell University (1977).
  8. L. N. Howard and A. S. Gupta, J. Fluid Mech. 14, 463 (1962).
  9. S. Leibovich, J. Fluid Mech. (to be published).
  10. M. Lessen (private communication).

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