Optimal and robust control of small disturbances in a channel flow with a normal magnetic field

Active closed-loop control of subcritical and supercritical instabilities amplified in a channel flow submitted to a constant normal magnetic field is investigated. Control is carried out at both the upper and lower walls by blowing and suction (velocity control) or by a perturbation of the normal m...

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Bibliographic Details
Published in:Physics of fluids (1994) 2007-01, Vol.19 (1)
Main Authors: Debbagh, K., Cathalifaud, P., Airiau, C.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Flow control
Flows in ducts, channels, nozzles, and conduits
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Physics
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Summary:Active closed-loop control of subcritical and supercritical instabilities amplified in a channel flow submitted to a constant normal magnetic field is investigated. Control is carried out at both the upper and lower walls by blowing and suction (velocity control) or by a perturbation of the normal magnetic field (magnetic control). Even if a velocity control is more efficient than a magnetic one, we found that magnetic control succeeds in stabilizing supercritical instabilities. Development of new actuators using magnetic field for flow control may thus be promising. Closed-loop control modifies the optimal perturbation but does not destruct the lift-up effect.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.2429038