Attractors for the motion of a finitesize particle in a twosided liddriven cavity
Article dans une revue avec comité de lecture
Date
202011Journal
Journal of Fluid MechanicsAbstract
The motion of a single spherical particle in a twosided liddriven cavity is investigated experimentally. The flow in which the particle moves is created by two facing cavity sidewalls which move with equal velocity in opposite directions. For a long cavity with widthtoheight crosssectional aspect ratio Γ=W/H=1.6 the flow field at Reynolds number Re=400 consists of steady spatially periodic threedimensional convection cells. Nearly neutrally buoyant particles with radius in units of H ranging from 1.1×10−2 to 7.1×10−2 are found to be attracted to periodic or quasiperiodic orbits in close vicinity of Kolmogorov–Arnold–Moser (KAM) tori of the unperturbed flow. Like the KAM tori the attractors of neutrally buoyant particles arise in mirrorsymmetric pairs within each convection cell. The particle attractors are created by a dissipative effect in the dynamical system describing the particle motion which arises when the finitesize particle closely passes the moving walls. When the particle density deviates from that of the fluid, inertial attractors arise whose symmetry is broken by buoyancy, and other periodic attractors are created which do not have KAM tori as counterparts.
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