Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compressible fluid inside a linear oscillator   We use Feireisl-Lions theory to deduce the existence of weak solutions to a
system describing the dynamics of a linear oscillator containing a Newtonian
compressible fluid. The appropriate Navier-Stokes equation is considered on a
domain whose movement has one degree of freedom. The equation is paired with
the Newton law and we assume a no-slip boundary condition.

6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph