Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Development of Anisotropy in Incompressible Magnetohydrodynamic
  Turbulence   We present a set of three-dimensional (3D) direct numerical simulations of
incompressible decaying magnetohydrodynamic turbulence in which we investigate
the influence of an external uniform magnetic field B_0. A parametric study in
terms of B_0 intensity is made where, in particular, we distinguish the shear-
from the pseudo-Alfven waves dynamics. The initial kinetic and magnetic
energies are equal with a negligible cross-correlation. Both the temporal and
spectral effects of B_0 are discussed. A sub-critical balance is found between
the Alfven and nonlinear times with both a global and a spectral definition.
The nonlinear dynamics of strongly magnetized flows is characterized by a
different k_perp-spectrum (where B_0 defines the parallel direction) if it is
plotted at a fixed k_// (2D spectrum) or if it is integrated (averaged) over
all k_// (1D spectrum). In the former case a much wider inertial range is found
with a steep power law, closer to the wave turbulence prediction than the
Kolmogorov one like in the latter case. It is believed that the averaging
effect may be a source of difficulty to detect the transition towards wave
turbulence in natural plasmas. For the first time, the formation of filaments
is reported within current and vorticity sheets in strongly magnetized flows
which modifies our classical picture of dissipative sheets in conductive flows.

27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an