Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An adaptive particle-mesh gravity solver for ENZO   We describe and implement an adaptive particle-mesh algorithm to solve the
Poisson equation for grid-based hydrodynamics codes with nested grids. The
algorithm is implemented and extensively tested within the astrophysical code
Enzo against the multigrid solver available by default. We find that while both
algorithms show similar accuracy for smooth mass distributions, the adaptive
particle-mesh algorithm is more accurate for the case of point masses, and is
generally less noisy. We also demonstrate that the two-body problem can be
solved accurately in a configuration with nested grids. In addition, we discuss
the effect of subcycling, and demonstrate that evolving all the levels with the
same timestep yields even greater precision.

18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph