Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Explicit high-order noncanonical symplectic algorithms for ideal
  two-fluid systems   An explicit high-order noncanonical symplectic algorithm for ideal two-fluid
systems is developed. The fluid is discretized as particles in the Lagrangian
description, while the electromagnetic fields and internal energy are treated
as discrete differential form fields on a fixed mesh. With the assistance of
Whitney interpolating forms, this scheme preserves the gauge symmetry of the
electromagnetic field, and the pressure field is naturally derived from the
discrete internal energy. The whole system is solved using the Hamiltonian
splitting method discovered by He et al., which was been successfully adopted
in constructing symplectic particle-in-cell schemes. Because of its structure
preserving and explicit nature, this algorithm is especially suitable for
large-scale simulations for physics problems that are multi-scale and require
long-term fidelity and accuracy. The algorithm is verified via two tests:
studies of the dispersion relation of waves in a two-fluid plasma system and
the oscillating two-stream instability.

35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph