Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetohydrodynamic simulations of the elliptical instability in
  triaxial ellipsoids   The elliptical instability can take place in planetary cores and stars
elliptically deformed by gravitational effects, where it generates large-scale
three-dimensional flows assumed to be dynamo capable. In this work, we present
the first magneto-hydrodynamic numerical simulations of such flows, using a
finite-element method. We first validate our numerical approach by comparing
with kinematic and dynamic dynamos benchmarks of the literature. We then
systematically study the magnetic field induced by various modes of the
elliptical instability from an imposed external field in a triaxial ellipsoidal
geometry, relevant in a geo- and astrophysical context. Finally, in tidal
induction cases, the external magnetic field is suddenly shut down and the
decay rates of the magnetic field are systematically reported.

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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: stat
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
27
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: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
2
The categories of this paper are: math
9
The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio