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On hypersonic self-induced separation, hydraulic jumps and boundary layers with algebraic growth

Part of: Incompressible viscous fluids

Published online by Cambridge University Press:  26 February 2010

J. Gajjar  and
F. T. Smith
J. Gajjar
Affiliation:
Department of Mathematics, Imperial College, London, SW7 2BZ
F. T. Smith
Affiliation:
Department of Mathematics, Imperial College, London, SW7 2BZ
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Summary

Analytical and numerical properties are described for the free interaction and separation arising when the induced pressure and local displacement are equal, in reduced terms, for large Reynolds number flow. The interaction, known to apply to hypersonic flow, is shown to have possible relevance also to the origins of supercritical (Froude number > 1) hydraulic jumps in liquid layers flowing along horizontal walls. The main theoretical task is to obtain the ultimate behaviour far beyond the separation. An unusual structure is found to emerge there, involving a backward–moving wall layer with algebraically growing velocity at its outer edge, detached shear layer moving forward and, in between, reversed inertial flow uninfluenced directly by the adverse pressure gradient. As a result the pressure then increases like (distance)m, with m = 2(√(7)–2)/3 ( = 0.43050 …), and does not approach a plateau. Some more general properties of (Falkner–Skan) boundary layers with algebraic growth are also described.

MSC classification

Secondary: 76D10: Boundary-layer theory, separation and reattachment, higher-order effects
Type
Research Article
Information
Mathematika , Volume 30 , Issue 1 , June 1983 , pp. 77 - 93
Copyright
Copyright © University College London 1983

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