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The structure of the large eddies in fully developed turbulent shear flows. Part 2. The plane wake

Published online by Cambridge University Press:  20 April 2006

J. C. Mumford
J. C. Mumford
Affiliation:
Fluid Dynamics Section, Cavendish Laboratory, Madingley Road, Cambridge, U.K.
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Abstract

A set of measurements using arrays of hot-wire anemometers has been performed in the fully developed turbulent wake of a circular cylinder. The data were digitized, recorded on magnetic tape, and processed using the pattern recognition technique described in Part 1 (Mumford 1982), to yield ensemble averages of the streamwise component of the velocity fields of the large eddies in the flow.

The results indicate that the large-scale structures in the turbulent wake are predominantly the inclined ‘double-roller’ vortices described by Grant (1958). These eddies consist of two contrarotating roller-like vortices with parallel axes displaced in the spanwise direction and approximately aligned with the direction of the strain associated with the mean velocity gradient. It was found that the structures are often confined to either side of the wake centreplane, rather than extending over the entire thickness of the turbulent region. In addition, eddies of similar type tended to occur in pairs or longer groups with their centres separated in the stream direction.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 137 , December 1983 , pp. 447 - 456
Copyright
© 1983 Cambridge University Press

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References

Grant, H. L. 1958 J. Fluid Mech. 4, 149.
Hunt, J. C. R. 1977 Fluid Dyn. Trans. 9, 121.
Kawall, J. G. & Keffer, J. F. 1981 In Proc. 3rd Symp. on Turbulent Shear Flows, p. 15.18.
Keffer, J. F. 1965 J. Fluid Mech. 22, 135.
Loeve, M. 1955 Probability Theory. Von Nostrand.
Lumley, J. L. 1967 In Atmospheric Turbulence and Radio Wave Propagation, Proc. Intl Colloq., Moscow, 1965 (ed. A. M. Yaglom & V. I. Tatarsky), p. 166. Nauka.
Mumford, J. C. 1982 J. Fluid Mech. 118, 241.
Payne, F. R. & Lumley, J. L. 1967 Phys. Fluids Suppl. 10, S194.
Savill, A. M. 1979 Effects on turbulence of curved or distorting mean flow. Ph.D. dissertation, University of Cambridge.
Savill, A. M. 1982 The turbulence structure of a highly curved plane wake. In Proc. IUTAM Symp. on the Structure of Complex Turbulent Shear Flow, Marseille.
Townsend, A. A. 1956 The Structure of Turbulent Shear Flow. Cambridge University Press.
Townsend, A. A. 1966 J. Fluid Mech. 26, 689.
Townsend, A. A. 1979 J. Fluid Mech. 95, 515.