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Oscillatory motion in a side-heated cavity

Published online by Cambridge University Press:  26 April 2006

S. G. Schladow
S. G. Schladow
Affiliation:
Environmental Fluid Mechanics Laboratory, Department of Civil Engineering, Stanford University, Stanford, CA 94305-4020, USA Present address: Centre for Limnological Modelling, Department of Civil and Environmental Engineering, University of Western Australia, Nedlands, Western Australia, 6009.
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Abstract

Direct numerical simulations of the transient flow in a side-heated cavity have been conducted for a Rayleigh Number of 2 × 109, an aspect ratio of 1 and a Prandtl Number of 7.1. The results show the presence of both long-period and short-period oscillations. The long-period oscillation is a cavity-scale mode produced by the tilting of the isotherms. The short-period oscillations are shown to be the result of two distinct boundary-layer instabilities. Whereas the latter oscillations can produce large deviations in the observed temperature records, they are relatively shortlived and have only a minor influence on the evolution of the flow towards steady state. The suggestion of the existence of an internal hydraulic jump in such flows has been investigated and found to be incorrect.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 213 , April 1990 , pp. 589 - 610
Copyright
© 1990 Cambridge University Press

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