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research article

Studying edge geometry in transiently turbulent shear flows

Chantry, Matthew
•
Schneider, Tobias M.  
2014
Journal of Fluid Mechanics

In linearly stable shear flows at moderate Reynolds number, turbulence spontaneously decays despite the existence of a codimension-one manifold, termed the edge, which separates decaying perturbations from those triggering turbulence. We statistically analyse the decay in plane Couette flow, quantify the breaking of self-sustaining feedback loops and demonstrate the existence of a whole continuum of possible decay paths. Drawing parallels with low-dimensional models and monitoring the location of the edge relative to decaying trajectories, we provide evidence that the edge of chaos does not separate state space globally. It is instead wrapped around the turbulence generating structures and not an independent dynamical structure but part of the chaotic saddle. Thereby, decaying trajectories need not cross the edge, but circumnavigate it while unwrapping from the turbulent saddle.

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Type
research article
DOI
10.1017/jfm.2014.150
Web of Science ID

WOS:000336805500022

Author(s)
Chantry, Matthew
Schneider, Tobias M.  
Date Issued

2014

Publisher

Cambridge University Press

Published in
Journal of Fluid Mechanics
Volume

747

Start page

506

End page

517

Subjects

instability

•

nonlinear dynamical systems

•

transition to turbulence

Note

National Licences

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ECPS  
Available on Infoscience
August 29, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/106571
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