title: Stabilization of vortices in the wake of a circular cylinder using harmonic forcing.
abstract: We explore whether vortex flows in the wake of a fixed circular cylinder can be stabilized using harmonic forcing. We use Föppl's point vortex model augmented with a harmonic point source-sink mechanism which preserves conservation of mass and leaves the system Hamiltonian. We discover a region of Lyapunov-stable vortex motion for an appropriate selection of parameters. We identify four unique parameters that affect the stability of the vortices: the uniform flow velocity, vortex equilibrium positions, forcing amplitude, and forcing frequency. We assess the robustness of the controller using a Poincaré section.
authors.affiliation: Department of Mathematics, Technical University of Denmark, Lyngby DK-2800, Denmark.
authors.forename: Georges C
authors.initials: GC
authors.lastname: Chamoun
authors.forename: Frank
authors.initials: F
authors.lastname: Schilder
authors.forename: Morten
authors.initials: M
authors.lastname: Brøns