Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The negative viscosity induces more disturbances in a flow   Negative viscosity seems to be an impossible parameter for any thermodynamic
system. But for some special boundary conditions the viscosity of a fluid has
apparently become negative, like for secondary flow of a fluid or in a plasma
flow interacting with a dominant magnetic field. This work studied the effect
of negative viscosity for a fluid flow over a cylinder. Four different
viscosities are considered, in which the positive viscosities of Air and CO2
has been considered at 300 K temperature and their negative pair of viscosities
are considered in this work. The results show a vast difference in the vortex
formation and pattern. General incompressible Navier Stokes equation has been
employed for the analysis. The thermodynamic feasibility, vortex formation,
variation of X direction velocity, variation of the VA factor and variation of
drag coefficient has been studied subsequently in this work. SimFlow CFD
software has been used in this work, which uses the OpenFOAM solver.

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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph