Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simulating hydromagnetic processes in star formation: introducing
  ambipolar diffusion into an adaptive mesh refinement code   Given the importance of simulating hydromagnetic processes that impact star
formation, we have earlier developed a 3D adaptive mesh approach that allows us
to include hydromagnetic processes during the formation and evolution of cores,
discs, and stars in observed regions of star formation. In this paper, we take
the next step in this program - namely - to develop a modified version of the
3D adaptive mesh refinement (AMR) code FLASH in which the ambipolar diffusion
of the magnetic field in poorly ionized molecular gas is implemented. We
approach the problem using a single-fluid approximation to simplify numerical
calculations. In this paper, we present a series of test cases including
oblique isothermal and non--isothermal C-shocks. We also present a study of the
quasi-static collapse of an initial uniform, self-gravitating, magnetized
sphere that is initially supported by its magnetic field against collapse (i.e.
magnetically subcritical). Applications to the collapse of a pre-stellar
Bonnor-Ebert sphere are presented in a companion paper.

25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph