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Data-based models for flow control

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Figure 1.3: Flow past a cylinder at R e = 33000. (a) uncontrolled, (b) controlled by plasma actuators aiming at separation control.
Figure 1.5: Data-based and physics-based components of the system-identification procedure
Figure 2.1: Contours of averaged perturbation energy for an excitation by three upstream noise sources
Figure 2.3: Nyquist plot of the Open-Loop Transfer Function. Exact model: solid red line; nominal model: solid black line; and 95% likelihood bands centered around the nominal value: dashed blue line
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