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 (1954b) 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.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Reference13 articles.
1. 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.
2. 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.
3. Schlichting, H. 1955 Boundary Layer Theory. London:Pergamon Press.
4. Gerrard, J. H. 1965 A disturbance sensitive Reynolds number range of the flow past a circular cylinder.J. Fluid Mech. 22,187.
5. Goldstein, S. 1938 Modern Developments on Fluid Dynamics , vol. 2, figure 149.Oxford University Press.
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