Skip to Main content Skip to Navigation
Book sections

Closed-loop control of an unstable open cavity

Abstract : A closed loop control approach has been implemented for the case of an unstable open cavity flow. Model reduction techniques and Linear-Quadratic- Gaussian (LQG) control have been combined to stabilize the flow. A blowing/suction actuator has been placed upstream of the cavity and a skin friction sensor downstream of it. Reduced-order models based on global modes and balanced modes have been tested. We show that a reduced-order model based on the unstable global modes (to represent the unstable dynamics) and a few balanced modes (to capture the input-output dynamics of the stable sub-space between the actuator and the sensor) is optimal to stabilize the compensated system. On the other hand, it is shown that the direct and adjoint stable global modes are not appropriate to model the stable subspace due to their strong non-normality. © 2010 Springer-Verlag Berlin Heidelberg.
Complete list of metadatas

https://hal-polytechnique.archives-ouvertes.fr/hal-01020628
Contributor : Denis Roura <>
Submitted on : Tuesday, July 8, 2014 - 12:40:57 PM
Last modification on : Friday, June 26, 2020 - 2:02:05 PM

Links full text

Identifiers

Collections

Citation

D. Sipp, Alexandre Barbagallo, Peter Schmid. Closed-loop control of an unstable open cavity. Rudibert King. Active Flow Control II, 108 (-), Springer, pp.275-289, 2010, Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 978-3-642-11734-3. ⟨10.1007/978-3-642-11735-0_18⟩. ⟨hal-01020628⟩

Share

Metrics

Record views

258