Review—Self-Sustaining Oscillations of Flow Past Cavities

[+] Author and Article Information
D. Rockwell

Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, Penn.

E. Naudascher

Institute of Hydromechanics, University of Karlsruhe, Karlsruhe, West Germany

J. Fluids Eng 100(2), 152-165 (Jun 01, 1978) (14 pages) doi:10.1115/1.3448624 History: Received August 01, 1977; Online October 12, 2010


Unstable flow past cavities is grouped into fluid-dynamic, fluid-resonant, and fluid-elastic categories. Fluid-dynamic oscillations are attributable to instability of the cavity shear layer and are enhanced through a feedback mechanism. Fluid-resonant oscillations are governed by resonance conditions associated with compressibility or freesurface wave phenomena. Fluid-elastic oscillations are primarily controlled by the elastic displacements of a solid boundary. Experimental information and theoretical models for the frequencies and amplitudes of each of these categories of oscillations as well as a combination of them are discussed in detail. Effects of arrangements of cavities in groups and variations in cavity shape (rectangular, circular, triangular, whistle-type, Helmholtz-type) are reviewed. Means of attenuation of oscillations via geometrical modifications and mass addition are summarized. Finally, the effects of cavity oscillations on the time-mean cavity pressure, drag, and shear-layer characteristics are discussed.

Copyright © 1978 by ASME
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