Resonant enhanced diffusion in time dependent flow

Details Resonant enhanced diffusion in time dependent flow Resonant enhanced diffusion in time dependent flow

1998-03-27

arxiv.org/abs/chao-dyn/9804003v1

Nonlinear Sciences

Chaotic Dynamics

18 latex pages, 11 figures

Scientific paper

10.1088/0305-4470/31/35/002

Explicit examples of scalar enhanced diffusion due to resonances between different transport mechanisms are presented. Their signature is provided by the sharp and narrow peaks observed in the effective diffusivity coefficients and, in the absence of molecular diffusion, by anomalous transport. For the time-dependent flow considered here, resonances arise between their oscillations in time and either molecular diffusion or a mean flow. The effective diffusivities are calculated using multiscale techniques.

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