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| Titel |
Non-diffusive, non-local transport in fluids and plasmas |
| VerfasserIn |
D. del-Castillo-Negrete |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 17, no. 6 ; Nr. 17, no. 6 (2010-12-20), S.795-807 |
| Datensatznummer |
250013766
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| Publikation (Nr.) |
 copernicus.org/npg-17-795-2010.pdf |
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| Zusammenfassung |
| A review of non-diffusive transport in fluids and plasmas is presented. In
the fluid context, non-diffusive chaotic transport by Rossby waves in zonal
flows is studied following a Lagrangian approach. In the plasma physics
context the problem of interest is test particle transport in
pressure-gradient-driven plasma turbulence. In both systems the probability
density function (PDF) of particle displacements is strongly non-Gaussian and
the statistical moments exhibit super-diffusive anomalous scaling. Fractional
diffusion models are proposed and tested in the quantitative description of
the non-diffusive Lagrangian statistics of the fluid and plasma problems.
Also, fractional diffusion operators are used to construct non-local
transport models exhibiting up-hill transport, multivalued flux-gradient
relations, fast pulse propagation phenomena, and "tunneling" of
perturbations across transport barriers. |
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