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The mechanics of the formation region of vortices behind bluff bodies
Abstract
The characteristic lengths of the oscillating wakes of bluff bodies is discussed; in particular, those used in the universal non-dimensional frequencies proposed by Roshko (1954 b) and Goldburg, Washburn & Florsheim (1965). It is concluded that these are equivalent at high Reynolds number. A closer examination leads to the conclusion that there are two simultaneous characteristic lengths; the scale of the formation region, and the width to which the free shear layers diffuse. Discussion of the mechanics of the formation region results in a physical basis for the determination of the frequency by these two characteristic lengths. The ideas developed are applied to the effects of splitter plates in the wake. The possibility of a high-Reynolds-number symmetrical formation region is suggested as an explanation of the very small lift values observed in the absence of free-stream disturbances.
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Research works printed but not linked: 7
- Bearman, P. W. 1965 Investigation of the flow behind a two dimensional model with blunt trailing edge and fitted with splitter plates.J. Fluid Mech. 21,241. · doi:10.1017/s0022112065000162
- Goldburg, A. , Washburn, W. K. & Florsheim, B. H. 1965 Strouhal numbers for the hypersonic wakes of spheres and cones.A.I.A.A. J. 3.1332. · doi:10.2514/3.3133
- Schlichting, H. 1955 Boundary Layer Theory. London:Pergamon Press.
- Gerrard, J. H. 1965 A disturbance sensitive Reynolds number range of the flow past a circular cylinder.J. Fluid Mech. 22,187. · doi:10.1017/s0022112065000666
- Goldstein, S. 1938 Modern Developments on Fluid Dynamics , vol. 2, figure 149.Oxford University Press.
- Bloor, M. S. 1964 The transition to turbulence in the wake of a circular cylinder.J. Fluid Mech. 19,290. · DOI
- Kronauer, R. E. 1964 Unpublished presentation at I.U.T.A.M. conference on concentrated vortex motions, Ann Arbor.
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Metadata
- Authors
- Gerrard, J. H.
- Venue
- Journal of Fluid Mechanics
- Publisher
- Cambridge University Press (CUP)
- Published
- 1966-06
- Volume
- 25
- Issue
- 2
- Pages
- 401-413
- ISSN
- 0022-1120 (ISSN-L)
- 1469-7645
- OpenAlex
- W2009890882
- Cited by
- 996
- References
- 0
- FWCI
- 5.54
- Type
- journal article
- Language
- en
- Open access
- closed
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