Abstract
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.
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