Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrasound scattering and the study of vortex correlations in disordered
  flows   In an idealized way, some turbulent flows can be pictured by assemblies of
many vortices characterized by a set of particle distribution functions.
Ultrasound provide an useful, nonintrusive, tool to study the spatial structure
of vorticity in flows. This is analogous to the use of elastic neutron
scattering to determine liquid structure. We express the dispersion relation,
as well as the scattering cross section, of sound waves propagating in a
``liquid'' of identical vortices as a function of vortex pair correlation
functions. In two dimensions, formal analogies with ionic liquids are pointed
out.

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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin