Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An instability mechanism of pulsatile flow along particle trajectories
  for the axisymmetric Euler equations   The dynamics along the particle trajectories for the 3D axisymmetric Euler
equations in an infinite cylinder are considered. It is shown that if the
inflow-outflow is rapidly increasing in time, the corresponding laminar profile
of the Euler flow is not (in some sense) stable provided that the swirling
component is not small. This exhibits an instability mechanism of pulsatile
flow. In the proof, Frenet-Serret formulas and orthonormal moving frame are
essentially used.

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The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
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The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin