Dear Editor,
here is my report on the manuscript "Magnetic Prandtl number dependence of
turbulence generated by the chiral MHD dynamos" by J. Schober, etal.
The authors investigate the influence of the value of the magnetic Prandtl number
on the properties of the turbulent MHD in plasma generated by chiral MHD dynamos
based on the assumtion of the existence of an asymmetry in the number density
of left- and right-handed fermions. Strictly speaking, the existence of turbulent MHD dynamos, i.e.,
the generation of a uniform macroscopic magnetic field, are usually related
to the turbulent motion of electrically conductive environments. However, the magnetic
fields can be significantly amplified in chiral MHD dynamos and, through the Lorentz term
in the MHD equations, can nontrivialy drive turbulence as well as turbulent processes.
In the manuscript, the properties of chiral magnetically driven turbulence is
investigated using numerical simulations and, as it was already mentioned, the main aim
of the manuscript is to analyze the influence of the value of the turbulent Prandtl number
on these properties.
First of all, a brief theoretical description of the problem is given and three typical phases of
time evolution of the chiral magnetically driven turbulence are described. The authors then
solve the problem using numerical simulations with the so-called PENCIL CODE in three dimensions
with periodic conditions using various resolutions. New results in the manuscript are related
to the inclusion of various values of the magnetic Prandtl number (0.5