Collisional transport across the magnetic field in drift-fluid models

Drift ordered fluid models are widely applied in studies of low-frequency turbulence in the edge and scrape-off layer regions of magnetically confined plasmas. Here, we show how collisional transport across the magnetic field is self-consistently incorporated into drift-fluid models without altering...

Full description

Saved in:
Bibliographic Details
Published in:Physics of plasmas 2016-03, Vol.23 (3)
Main Authors: Madsen, J., Naulin, V., Nielsen, A. H., Rasmussen, J. Juul
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computational fluid dynamics
Computer simulation
COMPUTERIZED SIMULATION
CORRELATIONS
DENSITY
DIFFUSION
Drift
Fluid flow
FLUIDS
MAGNETIC FIELDS
Magnetism
Particle density (concentration)
PLASMA
PLASMA CONFINEMENT
Plasma physics
PLASMA SCRAPE-OFF LAYER
Plasmas (physics)
TOKAMAK DEVICES
Transport
TRANSPORT THEORY
TURBULENCE
Turbulence models
Two dimensional models
TWO-DIMENSIONAL CALCULATIONS
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Drift ordered fluid models are widely applied in studies of low-frequency turbulence in the edge and scrape-off layer regions of magnetically confined plasmas. Here, we show how collisional transport across the magnetic field is self-consistently incorporated into drift-fluid models without altering the drift-fluid energy integral. We demonstrate that the inclusion of collisional transport in drift-fluid models gives rise to diffusion of particle density, momentum, and pressures in drift-fluid turbulence models and, thereby, obviates the customary use of artificial diffusion in turbulence simulations. We further derive a computationally efficient, two-dimensional model, which can be time integrated for several turbulence de-correlation times using only limited computational resources. The model describes interchange turbulence in a two-dimensional plane perpendicular to the magnetic field located at the outboard midplane of a tokamak. The model domain has two regions modeling open and closed field lines. The model employs a computational expedient model for collisional transport. Numerical simulations show good agreement between the full and the simplified model for collisional transport.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4943199