Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simple mechanism for controlling vortex breakdown in a closed flow   This work is focused to study the development and control of the laminar
vortex breakdown of a flow enclosed in a cylinder. We show that vortex
breakdown can be controlled by the introduction of a small fixed rod in the
axis of the cylinder. Our method to control the onset of vortex breakdown is
simpler than those previously proposed, since it does not require any auxiliary
device system. The effect of the fixed rods may be understood using a simple
model based on the failure of the quasi-cylindrical approximation. We report
experimental results of the critical Reynolds number for the appearance of
vortex breakdown for different radius of the fixed rods and different aspect
ratios of the system. Good agreement is found between the theoretical and
experimental results.

8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex