Abstract
The laminar Kármán vortex flow in the wake of a cylinder can be suppressed in a certain Reynolds number range, if the cylinder is stimulated to small oscillations in a direction normal to the mean flow either externally by high-frequency fluctuations, or internally by negative feedback of a hot-wire signal picked up in the wake. If suppression is obtained, the transverse mean velocity profiles become deeper in comparison with those of vortex shedding, however the drag is of the same order in both cases. On the other hand the laminar vortex flow can be stabilized and extended to both lower and higher Reynolds numbers, by exciting the cylinder with frequencies, which synchronize the wake fluctuations.
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