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Edge states as medi...
Edge states as mediators of bypass transition in boundary-layer flows
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- Khapko, Taras (author)
- KTH,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre,Stabilitet, Transition, Kontroll
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- Kreilos, T. (author)
- Ecole Polytech Fed Lausanne, Emergent Complex Phys Syst Lab ECPS, CH-1015 Lausanne, Switzerland,Emergent Complexity in Physical Systems Laboratory (ECPS), École Polytechnique Fédérale de Lausanne
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- Schlatter, Philipp (author)
- KTH,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre,Strömningsmekanik och Teknisk Akustik,Mekanik
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- Duguet, Y. (author)
- Univ Paris Saclay, CNRS, LIMSI, F-91405 Orsay, France,LIMSI, CNRS, Université Paris-Saclay
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- Eckhardt, B. (author)
- Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany; Delft Univ Technol, JM Burgersctr, NL-2628 CD Delft, Netherlands,Fachbereich Physik, Philipps-Universität Marburg
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- Henningson, Dan S. (author)
- KTH,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre,Stabilitet, Transition, Kontroll
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(creator_code:org_t)
- 2016-07-21
- 2016
- English.
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In: Journal of Fluid Mechanics. - : Cambridge University Press (CUP). - 0022-1120 .- 1469-7645. ; 801
- Related links:
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Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- Boundary layers
- nonlinear dynamical systems
- transition to turbulence
Publication and Content Type
- ref (subject category)
- art (subject category)
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