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Two-dimensional magnetohydrodynamic turbulence in the small magnetic Prandtl number limit

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Abstract

In this paper we introduce a new method for computations of
two-dimensional magnetohydrodynamic (MHD) turbulence at low magnetic
Prandtl number $\Pra=\nu/\eta$. When $\Pra \ll 1$, the magnetic field
dissipates at a scale much larger than the velocity field. The method
we utilise is a novel hybrid contour--spectral method, the ``Combined
Lagrangian Advection Method'', formally to integrate the equations
with zero viscous dissipation. The method is compared with a standard
pseudo-spectral method for decreasing $\Pra$ for the problem of
decaying two-dimensional MHD turbulence. The method is shown to agree
well for a wide range of imposed magnetic field strengths. Examples of
problems for which such a method may prove invaluable are also given.
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Original languageEnglish
Pages (from-to)85-98
Number of pages14
JournalJournal of Fluid Mechanics
Volume703
Early online date14 Jun 2012
DOIs
Publication statusPublished - 1 Jul 2012

    Research areas

  • Computational methods, MHD turbulence, Turbulence simulation

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