Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shock Wave Structure for Argon, Helium, and Nitrogen   We compare the thickness of shock wave fronts at different Mach numbers,
modeled via Navier-Stokes (NS) and Quasi-gasdynamic (QGD) equations, with
experimental results from the literature. Monoatomic argon and helium, and
diatomic nitrogen, are considered. In this modeling a finite-difference scheme
with second-order spatial accuracy is employed. For argon the density thickness
calculated via QGD and NS models are in good agreement with each other, and
with the experimental results. For helium QGD and NS results agree well with
those from the bimodal model. For nitrogen, the QGD results are closer to the
experimental data than NS results. The QGD-based algorithm converges to the
steady state solution faster than the NS-based one.

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The categories of this paper are: cs
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
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The categories of this paper are: stat
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
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The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph