Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rayleigh--Taylor instability in a viscoelastic binary fluid   The effects of polymer additives on Rayleigh--Taylor (RT) instability of
immiscible fluids is investigated using the Oldroyd-B viscoelastic model.
Analytic results obtained exploiting the phase-field approach show that in
polymer solution the growth rate of the instability speeds up with elasticity
(but remains slower than in the pure solvent case). Numerical simulations of
the viscoelastic binary fluid model confirm this picture.

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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: cs