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A nonlinear instability burst in plane parallel flow

Published online by Cambridge University Press:  29 March 2006

L. M. Hocking ,
K. Stewartson ,
J. T. Stuart  and
S. N. Brown
L. M. Hocking
Affiliation:
Department of Mathematics, University College, London
K. Stewartson
Affiliation:
Department of Mathematics, University College, London
J. T. Stuart
Affiliation:
Department of Mathematics, Imperial College, London
S. N. Brown
Affiliation:
University College, London
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Abstract

An infinitesimal centre disturbance is imposed on a fully Ldveloped plane Poiseuille flow at a Reynolds number R slightly greater than the critical value Rc for instability. After a long time, t, the disturbance consists of a modulated wave whose amplitude A is a slowly varying function of position and time. In an earlier paper (Stewartson & Stuart 1971) the parabolic differential equation satisfied by A for two-dimensional disturbances was found; the theory is here extended to three dimensions. Although the coefficients of the equation are coinples, a start is made on elucidating the properties of its solutions by assuming that these coefficients are real. It is then found numerically and confirmed analytically that, for a finite value of (R-Rc)t, the amplitude A develops an infinite peak at the wave centre. The possible relevance of this work to the phenomenon of transition is discussed.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 51 , Issue 4 , 22 February 1972 , pp. 705 - 735
Copyright
© 1972 Cambridge University Press

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