Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A mechanism of vortex generation in a supersonic flow behind a
  gas-plasma interface   The origin of a vortex structure generated during the shock-plasma
interaction is investigated. A two-dimensional model based on the shock
refraction mechanism successfully unifies the vortex generation with major
co-processes typical for the interaction and thus well fits in their
cause-and-consequence relationship. Numerical simulations demonstrated the
possibility of an intense vortex generation with a continuous positive dynamics
as the shock crosses the interface. It was shown that while the vorticity is
triggered by the shock refraction on the interface, it is the gas parameter
distribution that distinctively determines the parameters of the vortex
evolution. The proposed model also provides an insight into interesting aspects
of the refraction effects for both, the shock wave and the flow behind it
(double refraction). The results are applicable to the problems of energy
deposition in a hypersonic flow, a flame-shock interaction, in combustion, in
astrophysics, and in the fusion research.

16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin