Fully resolved array of simulations investigating the influence of the magnetic Prandtl number on magnetohydrodynamic turbulence

Mairi E. McKay, Arjun Berera, Richard D. J. G. Ho

Research output: Contribution to journalArticlepeer-review

Abstract

We explore the effect of the magnetic Prandtl number Pm on energy and dissipation in fully resolved direct numerical simulations of steady-state, mechanically forced homogeneous magnetohydrodynamic turbulence in the range Pm = 1/32 to 32. We compare the spectra and show that if the simulations are not fully resolved, the steepness of the scaling of the kinetic-to-magnetic dissipation ratio with Pm is overestimated. We also present results of decaying turbulence with helical and nonhelical magnetic fields, where we find nonhelical reverse spectral transfer for Pm <1. The results of this systematic analysis have applications including stars, planetary dynamos, and accretion disks.
Original languageEnglish
Number of pages6
JournalPhysical Review E
DOIs
Publication statusPublished - 4 Jan 2019

Keywords

  • physics.flu-dyn
  • astro-ph.CO
  • physics.plasm-ph

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