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Boundary layer receptivity to free-stream turbulence and surface roughness over a swept flat plate
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-3251-8328
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-1146-3241
2011 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 23, no 3, 034107- p.Article in journal (Refereed) Published
Abstract [en]

An experimental study of the receptivity of disturbances and their subsequent development into a three-dimensional boundary layer has been carried out. The three-dimensional boundary layer was set up using a flat plate with a swept leading edge and a pressure gradient using a displacement body at the ceiling of the test section. Low level free-stream turbulence was generated with five different screens and was shown to generate traveling crossflow modes for all but the lowest turbulence level, i.e., for Tu > 0.2%, where instead a stationary crossflow disturbance dominated. Stationary crossflow disturbances were triggered by small cylindrical roughness elements arranged in an array. For high enough roughness Reynolds number (Re-k) stationary disturbances growing exponentially were seen and their amplitude seems to scale with Re-k(2.3).

Place, publisher, year, edition, pages
2011. Vol. 23, no 3, 034107- p.
Keyword [en]
DISTURBANCE GROWTH, BYPASS TRANSITION, STABILITY, FLOW, INSTABILITY
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-32600DOI: 10.1063/1.3562843ISI: 000289153000025Scopus ID: 2-s2.0-79953646585OAI: oai:DiVA.org:kth-32600DiVA: diva2:412055
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note
QC 20110420Available from: 2011-04-20 Created: 2011-04-18 Last updated: 2017-12-11Bibliographically approved

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Fransson, Jens H. M.Alfredsson, P. Henrik

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