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The Jeffery–Hamel similarity solution and its relation to flow in a diverging channel

Published online by Cambridge University Press:  07 November 2011

P. E. Haines*
Affiliation:
School of Mathematics, University of Manchester, Manchester M13 9PL, UK
R. E. Hewitt
Affiliation:
School of Mathematics, University of Manchester, Manchester M13 9PL, UK
A. L. Hazel
Affiliation:
School of Mathematics, University of Manchester, Manchester M13 9PL, UK
*
Email address for correspondence: philip.haines@adelaide.edu.au

Abstract

We explore the relevance of the idealized Jeffery–Hamel similarity solution to the practical problem of flow in a diverging channel of finite (but large) streamwise extent. Numerical results are presented for the two-dimensional flow in a wedge of separation angle , bounded by circular arcs at the inlet/outlet and for a net radial outflow of fluid. In particular, we show that in a finite domain there is a sequence of nested neutral curves in the plane, each corresponding to a midplane symmetry-breaking (pitchfork) bifurcation, where is a Reynolds number based on the radial mass flux. For small wedge angles we demonstrate that the first pitchfork bifurcation in the finite domain occurs at a critical Reynolds number that is in agreement with the only pitchfork bifurcation in the infinite-domain similarity solution, but that the criticality of the bifurcation differs (in general). We explain this apparent contradiction by demonstrating that, for , superposition of two (infinite-domain) eigenmodes can be used to construct a leading-order finite-domain eigenmode. These constructed modes accurately predict the multiple symmetry-breaking bifurcations of the finite-domain flow without recourse to computation of the full field equations. Our computational results also indicate that temporally stable, isolated, steady solutions may exist. These states are finite-domain analogues of the steady waves recently presented by Kerswell, Tutty, & Drazin (J. Fluid Mech., vol. 501, 2004, pp. 231–250) for an infinite domain. Moreover, we demonstrate that there is non-uniqueness of stable solutions in certain parameter regimes. Our numerical results tie together, in a consistent framework, the disparate results in the existing literature.

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Papers
Copyright
Copyright © Cambridge University Press 2011

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