Dispersion of tracer particles in a compressible flow

Details Dispersion of tracer particles in a compressible flow Dispersion of tracer particles in a compressible flow

2004-02-19

arxiv.org/abs/nlin/0402031v1

Europhys. Lett. 66 (2004) 219

Nonlinear Sciences

Chaotic Dynamics

6 pages, 4 figures

Scientific paper

10.1209/epl/i2003-10187-x

The turbulent diffusion of Lagrangian tracer particles has been studied in a flow on the surface of a large tank of water and in computer simulations. The effect of flow compressibility is captured in images of particle fields. The velocity field of floating particles has a divergence, whose probability density function shows exponential tails. Also studied is the motion of pairs and triplets of particles. The mean square separation is fitted to the scaling form ~ t^alpha, and in contrast with the Richardson-Kolmogorov prediction, an extended range with a reduced scaling exponent of alpha=1.65 pm 0.1 is found. Clustering is also manifest in strongly deformed triangles spanned within triplets of tracers.

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