The active dynamic control of flow fields often makes use of some convective instability of the considered flow (e.g.,the Tollmien Schlichting (TSS) or the Kelvin Helmholtz(KH) instability).Then it is sufficient to force the flow at a location where the instability is receptive to external perturbatioons while the choice of the forcing mechanism,e.g. oscillations of solid surfaces,sound,or oscillatory suction and blowing is not critical in most cases.
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