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Author Kim, Eun-jin ♦ Hahm, T. S. ♦ Diamond, P. H.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ ANISOTROPY ♦ CANCELLATION ♦ MAGNETIC FIELDS ♦ MAGNETOHYDRODYNAMICS ♦ SHEAR ♦ STRESSES ♦ TRANSPORT ♦ TURBULENCE ♦ VISCOSITY
Abstract The effect of Alfven waves on turbulent momentum transport is studied in three-dimensional reduced magnetohydrodynamic turbulence. A strong external uniform magnetic field B{sub 0} is assumed to be present orthogonal to both background shear flow and its inhomogeneity. Energy is injected into the fluid and/or magnetic field on small scales. It is shown analytically that eddy viscosity is reduced as 1/B{sub 0}{sup 2} for a strong B{sub 0}, due to the cancellation of the Reynolds stress by Maxwell stress. The sign of eddy viscosity is found to depend on the detailed properties of forcings. Specifically, it is positive for fluid forcing but depends on the anisotropy of the forcing in the case of magnetic forcing. Furthermore, it is indicated that a magnetic field tends to laminarize a mean shear flow. The possible implication of these results for the dynamics of the zonal flows in tokamaks is discussed in view of the cancellation of stresses.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-08-01
Publisher Place United States
Journal Physics of Plasmas
Volume Number 8
Issue Number 8


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