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[Leaking chaotic systems represent physical situations in which a hole or leak is introduced in a closed chaotic system. When such a hole is present, trajectories can escape from a trapping region of the phase space and wander for some time, before they return to the first region or settle to a different attractor. In the first case, the system displays intermittency, whereas in the second case, transient chaos is observed. The presence of transport barriers can prevent the leaking of trajectories between regions of the phase space. In the present study, transport barriers and intermittency are investigated in two dynamical systems. First, the topology of the phase space for symplectic maps is analyzed when a control parameter is varied, where a robust torus may or not be present. The patterns obtained are compared and the effect of the robust torus on the dynamical transport is described. In a second example, Raleigh-Bénard convection is studied in three-dimensional direct numerical simulations. By varying the magnitude of the Rayleigh number, a route to hyperchaos is reported, where an interior crisis leads to intermittency between quasiperiodic and hyperchaotic states.]
Published: Jun 15, 2018
Keywords: Transport Barrier; Interior Crisis; Transient Chaos; Chaotic Saddle; Isochronous Resonances
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