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Mastering nonlinear flow dynamics for laminar flow control
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-3310-0633
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-3251-8328
2016 (English)In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, ISSN 2470-0045, Vol. 94, no 2, 021103Article in journal (Refereed) Published
Abstract [en]

A laminar flow control technique based on spanwise mean velocity gradients (SVGs) has recently proven successful in delaying transition in boundary layers. Here we take advantage of a well-known nonlinear effect, namely, the interaction of two oblique waves at high amplitude, to produce spanwise mean velocity variations. Against common belief we are able to fully master the first stage of this nonlinear interaction to generate steady and stable streamwise streaks, which in turn trigger the SVG method. Our experimental results show that the region of laminar flow can be extended by up to 230%.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 94, no 2, 021103
Keyword [en]
Boundary-Layer-Transition, Waves, Stabilization, Stability, Streaks
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-192392DOI: 10.1103/PhysRevE.94.021103ISI: 000381607300001ScopusID: 2-s2.0-84983544085OAI: oai:DiVA.org:kth-192392DiVA: diva2:968153
Funder
EU, European Research Council, ERC-StG-2010-258339
Note

QC 20160912

Available from: 2016-09-12 Created: 2016-09-12 Last updated: 2016-09-12Bibliographically approved

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Sattarzadeh, Sohrab S.Fransson, Jens H. M.
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