Hostname: page-component-7c8c6479df-hgkh8 Total loading time: 0 Render date: 2024-03-29T05:03:51.026Z Has data issue: false hasContentIssue false

The vortex-shedding process behind two-dimensional bluff bodies

Published online by Cambridge University Press:  20 April 2006

A. E. Perry
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria 3052, Australia
M. S. Chong
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria 3052, Australia
T. T. Lim
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria 3052, Australia

Abstract

Using a variety of flow-visualization techniques, the flow behind a circular cylinder has been studied. The results obtained have provided a new insight into the vortex-shedding process. Using time-exposure photography of the motion of aluminium particles, a sequence of instantaneous streamline patterns of the flow behind a cylinder has been obtained. These streamline patterns show that during the starting flow the cavity behind the cylinder is closed. However, once the vortex-shedding process begins, this so-called ‘closed’ cavity becomes open, and instantaneous ‘alleyways’ of fluid are formed which penetrate the cavity. In addition, dye experiments also show how layers of dye and hence vorticity are convected into the cavity behind the cylinder, and how they are eventually squeezed out.

Type
Research Article
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.)

References

Batchelor, G. K. 1967 An Introduction to Fluid Dynamics. Cambridge University Press.
Bearman, P. W. & Graham, J. M. R. 1980 Vortex shedding from bluff bodies in oscillatory flow: A report on Euromech 119. J. Fluid Mech., 99, 225.Google Scholar
Berger, E. & Wille, R. 1972 Periodic flow phenomena. Ann. Rev. Fluid Mech. 4, 313.Google Scholar
Cantwell, B. J. 1975 A flying hot wire study of the turbulent near wake of a circular cylinder at a Reynolds number of 140000. Ph.D. thesis, California Institute of Technology.
Fromm, J. E. & Harlow, F. H. 1963 Numerical solution of the problem of vortex sheet development. Phys. Fluids 6, 975.Google Scholar
Gerrard, J. H. 1978 The wakes of cylindrical bluff bodies at low Reynolds number. Phil. Trans. R. Soc. Lond. A 289, 351.Google Scholar
Goldstein, S. 1965 Modern Developments in Fluid Dynamics, vol. 1. Dover.
Von Kármán, T. 1912 Collected works, vol. 1 (1902–1913), p. 339. Butterworths.
Kline, S. J. 1965 FM-48 Film loop. National Committee for Fluid Mechanics Films.
Lamb, H. 1945 Hydrodynamics, 6th edn. Dover.
Lighthill, M. J. 1963 In Laminar Boundary Layers (ed. L. Rosenhead), pp. 4888. Clarendon Press.
Mair, W. A. & Maull, D. J. 1971 Bluff bodies and vortex shedding - a report on Euromech 17. J. Fluid Mech. 45, 209.Google Scholar
Milne-Thomson, L. M. 1968 Theoretical Hydrodynamics, 5th edn. Macmillan.
Morkovin, M. V. 1964 Flow around circular cylinder - kaleidoscope of challenging fluid. phenomena. In Flow around circular cylinder - kaleidoscope of challenging fluid. phenomena, pp 102118. A.S.M.E.
Nayler, J. L. & Frazer, R. A. 1917 Vortex motion. (i) Preliminary report upon an experimental method of investigating, by aid of kinematograph photography, the history of eddying flow past a model immersed in water. Reports and Memoranda (new series) no. 332. Tech. Rep. of the Adv. Committee for Aeronautics.Google Scholar
Perry, A. E. & Fairlie, B. D. 1974 Critical points in flow patterns. Adv. Geophys. B 18, 299.Google Scholar
Perry, A. E. & Lim, T. T. 1978 Coherent structure in coflowing jets and wakes. J. Fluid Mech. 88, 451.Google Scholar
Perry, A. E., Lim, T. T. & Chong, M. S. 1980 The instantaneous velocity fields of coherent structures in coflowing jets and wakes. J. Fluid Mech. 101, 243.Google Scholar
Perry, A. E. & Watmuff, J. H. 1981 The phase-averaged large-scale structures in three-dimensional turbulent wakes. J. Fluid Mech. 103, 33.Google Scholar
Popham, A. E. 1946 The Drawings of Leonardo de Vinci. Jonathan Cape.
Prandtl, L. & Tietjens, O. G. 1934 Applied Hydro- and Aeromechanics. Dover.
Shapiro, A. H. & Bergman, R. 1962 Experiments performed under the direction of L. Prandtl (Göttingen). FM-11 Film loop. National Committee for Fluid Mechanics.
Smits, A. J. 1980 A visual study of separation bubbles. Int. Symp. on Flow Visualization, Bochum. Hemisphere.
Taneda, S. 1978 Visual study of unsteady separated flows and bodies. Prog. Aero. Sci. 17, 287.Google Scholar
Wille, R. 1960 Karman vortex streets. Adv. Appl. Mech. 6, 273.Google Scholar
Wille, R. 1966 On unsteady flows and transient motions. Prog. Aero. Sci. 7, 195.Google Scholar
Zdrakovich, M. M. 1969 Smoke observations of the formation of a ‘Kármán’ vortex street. J. Fluid Mech. 37, 491.Google Scholar