Volume 411, Number 3, December I 2003
|Page(s)||321 - 327|
|Published online||17 November 2003|
Turbulent magnetic Prandtl number and magnetic diffusivity quenching from simulations
Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes vei 2B, 7491 Trondheim, Norway
2 NORDITA, Blegdamsvej 17, 2100 Copenhagen Ø, Denmark
3 Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
Accepted: 25 August 2003
Forced turbulence simulations are used to determine the turbulent kinematic viscosity, , from the decay rate of a large scale velocity field. Likewise, the turbulent magnetic diffusivity, , 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, , is about unity. When the field is nonhelical, 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.
Key words: magnetohydrodynamics (MHD) / turbulence
© ESO, 2003
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