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Self-Sustained Localized Structures in a Boundary-Layer Flow
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-9627-5903
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7864-3071
2012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 108, no 4, 044501- p.Article in journal (Refereed) Published
Abstract [en]

When a boundary layer starts to develop spatially over a flat plate, only disturbances of sufficiently large amplitude survive and trigger turbulence subcritically. Direct numerical simulation of the Blasius boundary-layer flow is carried out to track the dynamics in the region of phase space separating transitional from relaminarizing trajectories. In this intermediate regime, the corresponding disturbance is fully localized and spreads slowly in space. This structure is dominated by a robust pair of low-speed streaks, whose convective instabilities spawn hairpin vortices evolving downstream into transient disturbances. A quasicyclic mechanism for the generation of offspring is unfolded using dynamical rescaling with the local boundary-layer thickness.

Place, publisher, year, edition, pages
2012. Vol. 108, no 4, 044501- p.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-90645DOI: 10.1103/PhysRevLett.108.044501ISI: 000299826400009Scopus ID: 2-s2.0-84856155800OAI: oai:DiVA.org:kth-90645DiVA: diva2:510153
Funder
Swedish e‐Science Research Center
Note

QC 20120315

Available from: 2012-03-15 Created: 2012-02-27 Last updated: 2017-12-07Bibliographically approved

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Schlatter, PhilippHenningson, Dan S.

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