Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling the turbulent cross-helicity evolution: Production,
  dissipation, and transport rates   It has been recognized that the turbulent cross helicity (correlation between
the velocity and magnetic-field fluctuations) can play an important role in
several magnetohydrodynamic (MHD) plasma phenomena such as the global
magnetic-field generation, turbulence suppression, etc. Despite its relevance
to the cross-helicity evolution, little attention has been paid to the
dissipation rate of the turbulent cross helicity, $\epsilon_W$. In this paper,
we consider the model expression for the dissipation rate of the turbulent
cross helicity. In addition to the algebraic model, an evolution equation of
$\epsilon_W$ is proposed on the basis of the statistical analytical theory of
inhomogeneous turbulence. A turbulence model with the modeling of $\epsilon_W$
is applied to the solar-wind turbulence. Numerical results on the large-scale
evolution of the cross helicity is compared with the satellite observations. It
is shown that, as far as the solar-wind application is concerned, the simplest
possible algebraic model for $\epsilon_W$ is sufficient for elucidating the
large-scale spatial evolution of the solar-wind turbulence. Dependence of the
cross-helicity evolution on the large-scale velocity structures such as
velocity shear and flow expansion is also discussed.

20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin