title: Effect of nonharmonic forcing on bluff-body vortex dynamics.
abstract: Forced nonharmonic excitation of the two-dimensional flow about a circular cylinder is studied by numerical simulations at mean Reynolds numbers of 180 and 150. Moderate deviations of the forced inflow velocity waveform from a pure harmonic generate different modes of phase-locked vortex formation in the cylinder wake, involving combinations of single and/or pairs of vortices for the same forcing frequency and peak-to-peak amplitude. The dynamical response of the wake oscillator is studied by employing phase portraits of the drag and lift coefficients that display modified limit-cycle behavior due to nonharmonic excitation. It is further shown that changing solely the velocity waveform can incite transition from a quasiperiodic state to a phase-locked state. The findings demonstrate that the wake oscillator is admissible to an infinite number of phase-locked and/or modulated states characterized by a single point on the frequency-amplitude plane.
authors.affiliation: Department of Engineering and Management of Energy Resources, University of Western Macedonia, Kozani 50100, Greece. ekonstantinidis@uowm.gr
authors.forename: E
authors.initials: E
authors.lastname: Konstantinidis
authors.forename: D
authors.initials: D
authors.lastname: Bouris