Non-diffusive, non-local transport in fluids and plasmas
- ORNL
A review on 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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1001295
- Journal Information:
- Nonlinear Processes in Geophysics, Vol. 17, Issue 6; ISSN 1607--7946
- Country of Publication:
- United States
- Language:
- English
Similar Records
Finite Larmor radius effects on nondiffusive tracer transport in a zonal flow
Self-consistent chaotic transport in fluids and plasmas