Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct numerical simulations of optimal thermal convection in rotating
  plane layer dynamos   The heat transfer behavior of convection-driven dynamos in a rotating plane
layer between two parallel plates, heated from below and cooled from the top,
is investigated. At a fixed rotation rate (Ekman Number, $E=10^{-6}$) and fluid
properties (thermal and magnetic Prandtl numbers, $Pr=Pr_m=1$), both dynamo
convection (DC) and non-magnetic rotating convection (RC) simulations are
performed to demarcate the effect of magnetic field on heat transport at
different thermal forcings (Rayleigh Number,
$Ra=3.83\times10^{9}-3.83\times10^{10}$). In this range, our turbulence
resolving simulations demonstrate the existence of an optimum thermal forcing,
at which heat transfer between the plates in DC exhibits maximum enhancement,
as compared to the heat transport in the RC simulations. Unlike any global
force balance reported in the literature, the present simulations reveal an
increase in the Lorentz force in the \textit{thermal boundary layer}, due to
stretching of magnetic field line by the vortices near the walls with no-slip
boundary condition. This increase in Lorentz force mitigates turbulence
suppression owing to the Coriolis force, resulting in enhanced turbulence and
heat transfer

15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci