Optimal open-loop control of the recirculation length in the wake of a cylinder
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Sensitivity analysis is used to design an open-loop control for separated flows. The length of the recirculation region lc is expressed as a cost functional, and its sensitivity to actuation is derived analytically. This analysis allows to identify regi ...
The analysis of Strykowski & Sreenivasan (JFM, 1990) provides experimental evidence that a small control cylinder suitably positioned in the wake of a main cylinder can alter vortex shedding close to the instability threshold. This problem was addressed fr ...
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The flow past an axisymmetric body is generically unstable to a steady and a time-periodic global instability, the latter being thought to lead the low-frequency unsteadiness of the wake even at larger Reynolds numbers. The present paper examines how the g ...
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