Publication Detail

Absolute instabilities and self-sustained oscillations in the wakes of circular cylinders

George Triantafyllou, K Kupfer, Abraham Bers

A new means of stability analysis is used to show that the von Karman vortex street in the wake of a circular cylinder is due to an absolute instability of the flow in the near wake. Linear stability analysis provides a relatively simple way of understanding the dynamics of the wake. Good agreement between analytical results and experimental observations suggests that the present methodology could potentially be applied to a variety of phenomena in flow transition and turbulence.

type: Technical reports

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