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Title:
Turbulent magnetic Prandtl number and magnetic diffusivity quenching from simulations
Authors:
Yousef, T. A.; Brandenburg, A.; Rüdiger, G.
Affiliation:
AA(Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes vei 2B, 7491 Trondheim, Norway), AB(NORDITA, Blegdamsvej 17, 2100 Copenhagen Ø, Denmark), AC(Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany)
Publication:
Astronomy and Astrophysics, v.411, p.321-327 (2003) (A&A Homepage)
Publication Date:
12/2003
Origin:
A&A
Astronomy Keywords:
magnetohydrodynamics (MHD), turbulence
DOI:
10.1051/0004-6361:20031371
Bibliographic Code:
2003A&A...411..321Y

Abstract

Forced turbulence simulations are used to determine the turbulent kinematic viscosity, nut , from the decay rate of a large scale velocity field. Likewise, the turbulent magnetic diffusivity, etat, is determined from the decay of a large scale magnetic field. In the kinematic regime, when the field is weak, the turbulent magnetic Prandtl number, nut/etat, is about unity. When the field is nonhelical, etat is quenched when magnetic and kinetic energies become comparable. For helical fields the quenching is stronger and can be described by a dynamical quenching formula.
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