This experimental study reports on the behavior of a filament attached to the rear of a three-dimensional cylinder. The axis of the cylinder is placed normal to a uniform incoming flow, and the filament is free to move in the cylinder wake. The mean position of the filament is studied as a function of the filament length L. It is found that for long (L/D $$>$$ > 6.5, where D is the cylinder diameter) and short (L/D $$<$$ < 2) filaments, the mean position of the filament tends to align with the incoming flow, whereas for intermediate filament lengths (2 $$<$$ < L/D $$<$$ < 6.5), the filament lies down on the cylinder and tends to align with the cylinder axis. The underlying mechanism of the bifurcations is discussed and related to buckling and inverted-pendulum-like instabilities.
Experiments in Fluids – Springer Journals
Published: Jun 9, 2015
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