Hostname: page-component-5b777bbd6c-7mr9c Total loading time: 0 Render date: 2025-06-21T12:04:39.070Z Has data issue: false hasContentIssue false
  • English
  • Français

The separation vortex in the Weis-Fogh circulation-generation mechanism

Published online by Cambridge University Press:  20 April 2006

R. H. Edwards  and
H. K. Cheng
R. H. Edwards
Affiliation:
Department of Aerospace Engineering, University of Southern California, Los Angeles
H. K. Cheng
Affiliation:
Department of Aerospace Engineering, University of Southern California, Los Angeles
Get access Rights & Permissions [Opens in a new window]

Abstract

The influence of leading-edge separation vortices on the Weis-Fogh (1973) lift- generation mechanism for insect hovering is investigated. The analysis employs a vortex-shedding model (Edwards 1954; Cheng 1954) and represents an extension of Lighthill's (1973, 1975) analysis of an inviscid model without separated vortices. Results of the study compare reasonably well with observations on a laboratory model at high Reynolds number (Maxworthy 1979), confirming that vortex separation significantly enhances the initial circulation on each of the wings. Unlike the un- separated-model solution, this circulation was found to depend on the history of the wing motion and to increase with a large opening angle.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 120 , July 1982 , pp. 463 - 473
Copyright
© 1982 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

Cheng, H. K. 1954 J. Aero. Sci. 21, 212.
Chorin, A. J. & Bernard, P. S. 1973 J. Comp. Phys. 13, 423.
Clements, R. R. & Maull, D. J. 1975 Prog. Aero. Sci. 16, 129.
Cooper, R. J. & Baker, P. S. 1977 Nature 269, 53.
Edwards, R. H. 1954 J. Aero. Sci. 21, 13.
Evans, R. A. & Bloor, M. I. G. 1977 J. Fluid Mech. 82, 115.
Fink, P. T. & Soh, W. K. 1978 Proc. R. Soc. A 362, 195.
Guiraud, J. P. & Zeytounian, R. Kh. 1980 J. Fluid Mech. 101, 393.
Katz, J. & Weihs, D. 1978 J. Aircraft 15, 871.
Lighthill, M. J. 1973 J. Fluid Mech. 60, 1.
Lighthill, M. J. 1975 Mathematical Biofluiddynamics. SIAM.
Maxworthy, T. 1979 J. Fluid Mech. 93, 47.
Maxworthy, T. 1981 Ann. Rev. Fluid Mech. 13, 329.
Moffatt, H. K. 1964 J. Fluid Mech. 18, 1.
Moore, D. W. J. Fluid Mech. 63, 225.
Rott, N. 1956 J. Fluid Mech. 1, 111.
Sarpkaya, T. 1975 J. Fluid Mech. 68, 109.
Wagner, H. 1925 Z. angew Math. Mech. 5, 17.
Weis-Fogh, T. 1973 J. Exp. Biol. 59, 169.
Weis-Fogh, T. 1975 In Swimming and Flying in Nature (ed. T. Y. T. Wu, C. J. Brokaw & C. Brennan) vol. II, p. 729. Plenum.
Winter, H. 1936 Strömungsvorgange an Platten und Profilerten Körpern bei Spannweiten, V.D.I.; English transl. NACA TM 798.Google Scholar