Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A numerical study of the Navier-Stokes transport coefficients for 2D
  granular hydrodynamics   A numerical study is presented to analyze the thermal mechanisms of unsteady,
supersonic granular flow, by means of hydrodynamic simulations of the
Navier-Stokes granular equations. For this purpose a paradigmatic problem in
granular dynamics such as the Faraday instability is selected. Two different
approaches for the Navier-Stokes transport coefficients for granular materials
are considered, namely the traditional Jenkins-Richman theory for moderately
dense quasi-elastic grains, and the improved Garz\'o-Dufty-Lutsko theory for
arbitrary inelasticity, which we also present here. Both solutions are compared
with event-driven simulations of the same system under the same conditions, by
analyzing the density, the temperature and the velocity field. Important
differences are found between the two approaches leading to interesting
implications. In particular, the heat transfer mechanism coupled to the density
gradient which is a distinctive feature of inelastic granular gases, is
responsible for a major discrepancy in the temperature field and hence in the
diffusion mechanisms.

7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
1
The categories of this paper are: cs