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Bypass transition and spot nucleation in boundary layers
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-9627-5903
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2016 (English)In: PHYSICAL REVIEW FLUIDS, ISSN 2469-990X, Vol. 1, no 4, article id 043602Article in journal (Refereed) Published
Abstract [en]

The spatiotemporal aspects of the transition to turbulence are considered in the case of a boundary-layer flow developing above a flat plate exposed to free-stream turbulence. Combining results on the receptivity to free-stream turbulence with the nonlinear concept of a transition threshold, a physically motivated model suggests a spatial distribution of spot nucleation events. To describe the evolution of turbulent spots a probabilistic cellular automaton is introduced, with all parameters directly obtained from numerical simulations of the boundary layer. The nucleation rates are then combined with the cellular automaton model, yielding excellent quantitative agreement with the statistical characteristics for different free-stream turbulence levels. We thus show how the recent theoretical progress on transitional wall-bounded flows can be extended to the much wider class of spatially developing boundary-layer flows.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2016. Vol. 1, no 4, article id 043602
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Physical Sciences
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URN: urn:nbn:se:kth:diva-199771DOI: 10.1103/PhysRevFluids.1.043602ISI: 000390209000003OAI: oai:DiVA.org:kth-199771DiVA, id: diva2:1067235
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QC 20170120

Available from: 2017-01-20 Created: 2017-01-16 Last updated: 2017-01-20Bibliographically approved

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Schlatter, PhilippHenningson, Dan S.

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