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Feedback control of vortex shedding

Simon Illingworth (Energy)


Feedback control of the cylinder wake at low Reynolds numbers is investigated. The control arrangement consists of a velocity probe in the cylinder's wake for sensing, together with blowing and suction on the cylinder's surface for actuation. Using data from direct numerical simulations as the starting point, reduced-order models of the cylinder wake are formed at a number of Reynolds numbers. Using these models, feedback controllers are designed using H_infinity loop-shaping techniques. Applying these controllers in direct numerical simulations, vortex shedding is completely suppressed up to Reynolds numbers of 100. As well as showing the efficacy of the feedback controllers, the presentation also addresses some of the challenges of control.