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Spatial Optimal Disturbances in Three-Dimensional Boundary Layers
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: 0000-0002-5913-5431
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control.ORCID iD: 0000-0001-7864-3071
2010 (English)In: / [ed] Schlatter P; Henningson DS, Springer, 2010, Vol. 18, 589-592 p.Conference paper, Published paper (Refereed)
Abstract [en]

A parabolised set of equations is used to compute spatial optimal disturbances in Falkner-Skan-Cooke boundary layers These disturbances associated with maximum energy growth initially take the form of vortices which are tilted against the direction of the mean crossflow shear. They evolve into bended streaks while traveling downstream and finally into crossflow disturbances when entering the supercritical domain of the boundary layer. Two physical mechanisms. namely the lift-up and the Orr-mechanism. can be identified as being responsible for non-modal growth in three-dimensional boundary layers A parametric study is presented where. amongst others, the influences of pressure gradient and sweep angle on optimal growth are investigated. It turns out that substantial disturbance growth is at found in regions of the flow where modal disturbances are damped.

Place, publisher, year, edition, pages
Springer, 2010. Vol. 18, 589-592 p.
Series
IUTAM Bookseries, 18
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-29876DOI: 10.1007/978-90-481-3723-7_107ISI: 000277097200107Scopus ID: 2-s2.0-84862271436ISBN: 978-90-481-3722-0 (print)OAI: oai:DiVA.org:kth-29876DiVA: diva2:399139
Conference
7th IUTAM Symposium on Laminar-Turbulent Transition, Royal Inst Technol, Stockholm, SWEDEN, JUN 23-26, 2009
Note

QC 20110221

Available from: 2011-02-21 Created: 2011-02-17 Last updated: 2016-04-21Bibliographically approved

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Hanifi, ArdeshirHenningson, Dan S.

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