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Edge states as mediators of bypass transition in boundary-layer flows
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0001-9627-5903
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2016 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 801, R2Article in journal (Refereed) Published
Abstract [en]

The concept of edge states is investigated in the asymptotic suction boundary layer in relation to the receptivity process to noisy perturbations and the nucleation of turbulent spots. Edge tracking is first performed numerically, without imposing any discrete symmetry, in a large computational domain allowing for full spatial localisation of the perturbation velocity. The edge state is a three-dimensional localised structure recurrently characterised by a single low-speed streak that experiences erratic bursts and planar shifts. This recurrent streaky structure is then compared with predecessors of individual spot nucleation events, triggered by non-localised initial noise. The present results suggest a nonlinear picture, rooted in dynamical systems theory, of the nucleation process of turbulent spots in boundary-layer flows, in which the localised edge state plays the role of state-space mediator.

Place, publisher, year, edition, pages
Cambridge University Press, 2016. Vol. 801, R2
Keyword [en]
boundary layers, nonlinear dynamical systems, transition to turbulence
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-192743DOI: 10.1017/jfm.2016.434ISI: 000381017900002Scopus ID: 2-s2.0-84979243339OAI: oai:DiVA.org:kth-192743DiVA: diva2:974411
Note

QC 20160926

Available from: 2016-09-26 Created: 2016-09-20 Last updated: 2017-11-21Bibliographically approved

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Khapko, TarasSchlatter, PhilippHenningson, Dan Stefan
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MechanicsLinné Flow Center, FLOWSeRC - Swedish e-Science Research CentreStability, Transition and Control
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