Dynamics and statistics of heavy particles in turbulent flows

Details Dynamics and statistics of heavy particles in turbulent flows Dynamics and statistics of heavy particles in turbulent flows

2006-01-12

arxiv.org/abs/nlin/0601027v1

Nonlinear Sciences

Chaotic Dynamics

13 pages, 10 figures, 2 tables

Scientific paper

10.1080/14685240600675727

We present the results of Direct Numerical Simulations (DNS) of turbulent flows seeded with millions of passive inertial particles. The maximum Taylor's Reynolds number is around 200. We consider particles much heavier than the carrier flow in the limit when the Stokes drag force dominates their dynamical evolution. We discuss both the transient and the stationary regimes. In the transient regime, we study the growt of inhomogeneities in the particle spatial distribution driven by the preferential concentration out of intense vortex filaments. In the stationary regime, we study the acceleration fluctuations as a function of the Stokes number in the range [0.16:3.3]. We also compare our results with those of pure fluid tracers (St=0) and we find a critical behavior of inertia for small Stokes values. Starting from the pure monodisperse statistics we also characterize polydisperse suspensions with a given mean Stokes.

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