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Observation of waves during oscillatory channel flow

Published online by Cambridge University Press:  20 April 2006

Ian J. Sobey
Ian J. Sobey
Affiliation:
School of Mathematics, University of Bristol, Bristol B58 1TW. England Present address: Schlumberger Cambridge Research, P.O. Box 153, Cambridge CB2 3BE, England.
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Abstract

We have observed steady and oscillatory flow through a two-dimensional channel expansion. The experimental results are supported by numerical solutions of the unsteady Navier–Stokes equations. This work was prompted by the recent discovery of vortex waves during steady flow past a moving indentation in a channel wall. Our work deals with both asymmetric channels, in which we show that vortex waves are observed during oscillatory flow with rigid walls, and with symmetric channels, in which a vortex street is observed. We believe that the vortex street is not a vortex wave, but the result of a shear-layer instability.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 151 , February 1985 , pp. 395 - 426
Copyright
© 1985 Cambridge University Press

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