Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetohydrodynamical Non-radiative Accretion Flows in Two-Dimensions   We present the results of axisymmetric, time-dependent magnetohydrodynamic
simulations of accretion flows around black holes. The calculations begin from
a rotationally supported thick torus which contains a weak poloidal field.
Accretion is produced by growth and saturation of the magnetorotational
instability (MRI) provided the wavelength of the fastest growing mode is less
than the thickness of the torus. Using a computational grid that spans more
than two decades in radius, we compare the time-averaged properties of the flow
to previous hydrodynamical simulations. The net mass accretion rate is small
compared to the mass inflow and outflow rates at large radii associated with
turbulent eddies. Turbulence is driven by the MRI rather than convection. The
two-dimensional structure of the time-averaged flow is significantly different
compared to the hydrodynamical case. We discuss the limitations imposed on our
results by the assumption of axisymmetry and the relatively small radial
domain.

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The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin