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Model reduction and control of a cavity-driven separated boundary layer
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. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7864-3071
2008 (English)In: IUTAM Symposium On Flow Control And Mems / [ed] Morrison, JF; Birch, DM; Lavoie, P, 2008, Vol. 7, 147-155 p.Conference paper, Published paper (Refereed)
Abstract [en]

The control of a globally unstable boundary-layer flow along a two-dimensional cavity is considered. When perturbed by the worst-case initial condition, the flow exhibits a large transient growth associated with the development of a wave packet along the cavity shear layer followed by a global cycle related to the least stable global eigenmodes. The flow simulation procedure is coupled to a measurement feedback controller, which senses the wall shear stress at the downstream lip of the cavity and actuates at the upstream lip. A reduced model for the control optimization is obtained by a projection on the least stable global eigenmodes. The LQG controller is run in parallel to the Navier-Stokes time integration. It is shown that the controller is able to damp out the global oscillations.

Place, publisher, year, edition, pages
2008. Vol. 7, 147-155 p.
Series
IUTAM Bookseries, 7
Keyword [en]
control, model reduction, global eigenmodes, separated flows
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-38396DOI: 10.1007/978-1-4020-6858-4_17ISI: 000253471500017Scopus ID: 2-s2.0-84861023084ISBN: 978-1-4020-6857-7 (print)OAI: oai:DiVA.org:kth-38396DiVA: diva2:437779
Conference
IUTAM Symposium on Flow Control and MEMS Location: Royal Geog Soc, London, ENGLAND Date: SEP 19-22, 2006
Available from: 2011-08-30 Created: 2011-08-25 Last updated: 2011-08-30Bibliographically approved

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Henningson, Dan S.

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