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Forcing a cylinder in the streamwise direction with a frequency much lower than the stationary shedding frequency significantly alters wake dynamics. During certain portions of the forcing cycle the wake resembles that of a stationary cylinder, while in others it exhibits strong unsteadiness. Although a range of flow phenomena are observed, it is shown that a novel time scaling framework can be used to relate the forced and unforced systems.
Shamai et al. (Mon,) studied this question.
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