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Turbulent dynamics of pipe flow captured in a reduced model: puff relaminarization and localized ‘edge’ states

Published online by Cambridge University Press:  25 January 2009

ASHLEY P. WILLIS  and
RICH R. KERSWELL
ASHLEY P. WILLIS*
Affiliation:
School of Mathematics, University of Bristol, BS8 1TW Bristol, UK
RICH R. KERSWELL
Affiliation:
School of Mathematics, University of Bristol, BS8 1TW Bristol, UK
*
†Email address for correspondence: willis@ladhyx.polytechnique.fr
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Abstract

Fully three-dimensional computations of flow through a long pipe demand a huge number of degrees of freedom, making it very expensive to explore parameter space and difficult to isolate the structure of the underlying dynamics. We therefore introduce a ‘2+ε-dimensional’ model of pipe flow, which is a minimal three-dimensionalization of the axisymmetric case: only sinusoidal variation in azimuth plus azimuthal shifts are retained; yet the same dynamics familiar from experiments are found. In particular the model retains the subcritical dynamics of fully resolved pipe flow, capturing realistic localized ‘puff-like’ structures which can decay abruptly after long times, as well as global ‘slug’ turbulence. Relaminarization statistics of puffs reproduce the memoryless feature of pipe flow and indicate the existence of a Reynolds number about which lifetimes diverge rapidly, provided that the pipe is sufficiently long. Exponential divergence of the lifetime is prevalent in shorter periodic domains. In a short pipe, exact travelling-wave solutions are found near flow trajectories on the boundary between laminar and turbulent flow. In a long pipe, the attracting state on the laminar–turbulent boundary is a localized structure which resembles a smoothened puff. This ‘edge’ state remains localized even for Reynolds numbers at which the turbulent state is global.

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Papers
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Journal of Fluid Mechanics , Volume 619 , 25 January 2009 , pp. 213 - 233
Copyright
Copyright © Cambridge University Press 2008

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