Global properties such as recirculation bubble, shedding frequency, base pressure and global mode amplitude of a turbulent wake produced by a “D” shape cylinder are studied when local stationary disturbances are placed downstream in the wake (one or two small control cylinders).The control cylinders have for main effect to push away further downstream the maxima of the global mode amplitude (or to increase the formation length).On the other hand and in accordance to the cavity models, it is found that the larger the drag reduction, the larger the size of the recirculation bubble of the “D” cylinder.These results suggest that the efficiency of this passive drag control depends crucially on the role of the global mode instability in the mechanism of the bubble closure.
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Cadot, O., Thiria, B., Beaudoin, JF. (2009). Passive Drag Control of a Turbulent Wake by Local Disturbances. In: Braza, M., Hourigan, K. (eds) IUTAM Symposium on Unsteady Separated Flows and their Control. IUTAM Bookseries, vol 14. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9898-7_46
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