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SUMMARY:Application of optimal control theory for the re-stabilization of 
 open flows: dream or reality?
DTSTART:20100521T101500
DTSTAMP:20260405T152024Z
UID:70f7352f8663b8c5eb79a0f066e5369d314ed01abcafd1374f54a0e9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. F. Gallaire\, Laboratoire de mécanique des fluides et i
 nstabilités\, EPFL Lausanne\, Switzerland. \nFlow control refers to the a
 bility to alter flows with the aim to achieve a desired effect\; examples 
 \ninclude drag reduction or noise attenuation among many other industrial 
 applications.  All these \nflow phenomena are associated with a strong flo
 w unsteadiness that can be viewed as the \nnonlinear development of an ini
 tially linear instability of the underlying laminar flow. Feedback \ncontr
 ol appears as a natural candidate to quench these incipient instabilities 
 at their earliest \nstages. \nIn this presentation\, we will first discuss
  how the transient and asymptotic linear flow dynamics \ncan be determined
  by means of iterative algorithms for giant eigenvalue problems\, which re
 sult \nfrom the discretization of the linearized governing equations of fl
 uid dynamics. As a typical \nexample\, detached boundary layer flows will 
 be considered. We will then discuss several model \nreduction techniques t
 hat yield low-order linear state-space representations amenable to LQG \nc
 ontrol and estimation. The effect of the feedback-control loop onto the ne
 glected dynamics \nwill be illustrated a posteriori  on several flow cases
 .
LOCATION:MEC2405
STATUS:CONFIRMED
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