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research article

Localized travelling waves in the asymptotic suction boundary layer

Kreilos, Tobias  
•
Gibson, John F.
•
Schneider, Tobias M.  
2016
Journal of Fluid Mechanics

We present two spanwise-localized travelling-wave solutions in the asymptotic suction boundary layer, obtained by continuation of solutions of plane Couette flow. One of the solutions has the vortical structures located close to the wall, similar to spanwise-localized edge states previously found for this system. The vortical structures of the second solution are located in the free stream far above the laminar boundary layer and are supported by a secondary shear gradient that is created by a large-scale low-speed streak. The dynamically relevant eigenmodes of this solution are concentrated in the free stream, and the departure into turbulence from this solution evolves in the free stream towards the walls. For invariant solutions in free-stream turbulence, this solution thus shows that the source of energy of the vortical structures can be a dynamical structure of the solution itself, instead of the laminar boundary layer.

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Type
research article
DOI
10.1017/jfm.2016.242
Web of Science ID

WOS:000374964700003

Author(s)
Kreilos, Tobias  
Gibson, John F.
Schneider, Tobias M.  
Date Issued

2016

Publisher

Cambridge University Press

Published in
Journal of Fluid Mechanics
Volume

795

Start page

R3

Subjects

boundary layers

•

nonlinear dynamical systems

•

transition to turbulence

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ECPS  
FunderGrant Number

FNS

200021_160088

Available on Infoscience
July 19, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/127791
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