title: Defect chaos and bursts: hexagonal rotating convection and the complex Ginzburg-Landau equation.
abstract: We employ numerical computations of the full Navier-Stokes equations to investigate non-Boussinesq convection in a rotating system using water as the working fluid. We identify two regimes. For weak non-Boussinesq effects the Hopf bifurcation from steady to oscillating (whirling) hexagons is supercritical and typical states exhibit defect chaos that is systematically described by the cubic complex Ginzburg-Landau equation. For stronger non-Boussinesq effects the Hopf bifurcation becomes subcritical and the oscillations exhibit localized chaotic bursting, which is modeled by a quintic complex Ginzburg-Landau equation.
authors.affiliation: Engineering Science and Applied Mathematics, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: Santiago
authors.initials: S
authors.lastname: Madruga
authors.forename: Hermann
authors.initials: H
authors.lastname: Riecke
authors.forename: Werner
authors.initials: W
authors.lastname: Pesch