ON THE SLOW INSTABILITY OFKARMAN VORTEX STREET

The KarmAn vortex street being linearly stable for an isolated case according to it’s classical point-vortex model has been shown numerically to hold also for other more complicated models. The stability of the Karman vortex street verified by using point-vortex model when perturbed infinitesimally is however a “slow instability”as shown by the simulation when the street is to be perturbed by finite disturbances.The concept of“slow instability” was verified to exist also in the case of wake flow by using th...