Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shear-Driven Flow in an Elliptical Enclosure Generated by an Inner
  Rotating Circular Cylinder   Shear-driven flow between a rotating cylinder and a stationary elliptical
enclosure is studied in this paper. Two-dimensional time-dependent Navier
Stokes equations are solved using a meshless method where interpolations are
done with Polyharmonic Spline Radial Basis Functions. The fluid flow is
analyzed for various aspect ratios of the ellipse and eccentric placements of
the inner cylinder. Contour plots of vorticity with streamlines, plots of
non-dimensional torque, and the angle of eye of the primary vortex are
presented in the paper for Reynolds numbers between 200 and 2000. Formation of
Moffatt like vortices in the wide-gap region of the model is observed and some
benchmark data are provided for various cases that are simulated.

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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: stat