McKay, Mairi E; Berera, Arjun; Ho, Richard DJG. (2018). Fully-resolved array of simulations investigating the influence of the magnetic Prandtl number, [dataset]. University of Edinburgh. School of Physics and Astronomy. http://dx.doi.org/10.7488/ds/2361.
This dataset is for a paper which is currently in submission.
We explore the effect of the magnetic Prandtl number Pr_M on energy and dissipation in fully-resolved direct numerical simulations of steady-state, mechanically-forced homogeneous magnetohydrodynamic turbulence in the range Pr_M=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 Pr_M is overestimated. We also present results of decaying turbulence with helical and nonhelical magnetic fields, where we find nonhelical reverse spectral transfer for Pr_M<1 for the first time. The results of this systematic analysis have applications ranging from tokamak reactors to black hole accretion disks.
The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336, VAT Registration Number GB 592 9507 00, and is acknowledged by the UK authorities as a “Recognised body” which has been granted degree awarding powers.