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Fractal clustering of inertial particles in random flows

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arxiv nlin/0306049 v2 pith:YEU5O5UI submitted 2003-06-24 nlin.CD

Fractal clustering of inertial particles in random flows

classification nlin.CD
keywords fractalinertialparticlespacedynamicaldynamicsflowsnumber
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It is shown that preferential concentrations of inertial (finite-size) particle suspensions in turbulent flows follow from the dissipative nature of their dynamics. In phase space, particle trajectories converge toward a dynamical fractal attractor. Below a critical Stokes number (non-dimensional viscous friction time), the projection on position space is a dynamical fractal cluster; above this number, particles are space filling. Numerical simulations and semi-heuristic theory illustrating such effects are presented for a simple model of inertial particle dynamics.

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