Turbulent transport of passive tracers and the onset of diffusivity

Details Turbulent transport of passive tracers and the onset of diffusivity Turbulent transport of passive tracers and the onset of diffusivity

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..414..213g&link_type=abstract

The workshop on two-dimensional turbulence in plasmas and fluids. AIP Conference Proceedings, Volume 414, pp. 213-234 (1997).

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Turbulent Flows

Scientific paper

The paper reviews some basic results of turbulent transport of passive tracers by a random Gaussian velocity field with short temporal correlation. Our emphasis is on the early ``transport'' phase of the process and the onset of diffusivity. We study the tracer mean-field and fluctuations via the reduced Fokker-Planck equation. The early (transport) phase exhibits steepening of gradients, fractalization of isocontours and exponential growth of statistical moments (fluctuations). We estimate the effective parameters of the process and give several applications, including randomly perturbed shear flows and the ``sedimentation problem''.

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