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Complete breakdown of an unsteady interactive boundary layer (over a surface distortion or in a liquid layer)

Part of:Incompressible viscous fluids

Published online by Cambridge University Press:  26 February 2010

R. V. Brotherton-Ratcliffe and
F. T. Smith
R. V. Brotherton-Ratcliffe
Affiliation:
Flat 3, 164, Queenstown Road, London, SW8 3QH.
F. T. Smith
Affiliation:
Department of Mathematics, University College London, Gower Street, London. WC1E6BT.
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Summary

It is shown first that internal or external boundary-layer flow over obstacles or other surface distortions is susceptible to a novel kind of viscous-inviscid instability, involving growth rates much larger than those of traditional Tollmien-Schlichting and Gortler modes for instance. The same instabilities arise in liquid-layer flow at sub-critical Froude number, and they are associated with an interacting boundary-layer problem where the normalized pressure is equal to the normalized displacement decrement. Second, certain limiting linear and nonlinear disturbances are studied to shed more light on the overall instability process and each form of disturbance leads to a finite-time collapse, although different in each case. Thirdly, and in consequence, the work finds the significant feature that the whole interacting boundary layer can break down nonlinearly within a finite scaled time.

MSC classification

Secondary:76D10: Boundary-layer theory, separation and reattachment, higher-order effects

Information

Type
Research Article
Information
Mathematika , Volume 34 , Issue 1 , June 1987, pp. 86 - 100
Copyright
Copyright © University College London 1987

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References

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