Model reduction and control of a cavity-driven separated boundary layer
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 (Refereed)
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.
, IUTAM Bookseries, 7
control, model reduction, global eigenmodes, separated flows
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-38396DOI: 10.1007/978-1-4020-6858-4_17ISI: 000253471500017ScopusID: 2-s2.0-84861023084ISBN: 978-1-4020-6857-7OAI: oai:DiVA.org:kth-38396DiVA: diva2:437779
IUTAM Symposium on Flow Control and MEMS Location: Royal Geog Soc, London, ENGLAND Date: SEP 19-22, 2006