Edge states as mediators of bypass transition in boundary-layer flows

Khapko T, Kreilos T, Schlatter P, Duguet Y, Eckhardt B, Henningson DS (2016)

Publication Type: Journal article

Publication year: 2016

Journal

Journal of Fluid Mechanics Cambridge University Press (CUP)

Book Volume: 801

Article Number: R2

DOI: 10.1017/jfm.2016.434

Abstract

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.

Authors with CRIS profile

Philipp Schlatter

Involved external institutions

Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE) École Polytechnique Fédérale de Lausanne (EPFL) CH Switzerland (CH) École Polytechnique - Université Paris-Saclay FR France (FR) Philipps-Universität Marburg DE Germany (DE)

How to cite

APA:

Khapko, T., Kreilos, T., Schlatter, P., Duguet, Y., Eckhardt, B., & Henningson, D.S. (2016). Edge states as mediators of bypass transition in boundary-layer flows. Journal of Fluid Mechanics, 801. https://doi.org/10.1017/jfm.2016.434

MLA:

Khapko, T., et al. "Edge states as mediators of bypass transition in boundary-layer flows." Journal of Fluid Mechanics 801 (2016).

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