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Absolute and convective instabilities in separation bubbles

Published online by Cambridge University Press:  04 July 2016

T. Allen  and
N. Riley
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Abstract

At a sufficiently high Reynolds number small separation bubbles, as for example at the leading-edge of an aerofoil, are characterised by laminar flow separation and turbulent reattachment. The transition to turbulence in the separated-flow region through the introduction of a disturbance at the boundary, localised in time and space, is examined. It is found that transition to turbulence is promoted by rapidly growing convective instabilities, and not an absolute instability at the point of application of the disturbance.

Type
Research Article
Information
The Aeronautical Journal , Volume 99 , Issue 990 , December 1995 , pp. 439 - 449
Copyright
Copyright © Royal Aeronautical Society 1995 

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Footnotes

*

Department of Mathematics, University College, London

†

School of Mathematics, University of East Anglia

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