Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A New Fluid Dynamical Model Coupling Heat with Application to Interior
  Separations   Based on the Boussinesq equations and the equation of state, a new fluid
dynamical model coupling heat is established. Furthermore, the conditions for
interior separation, which are determined by the initial conditions, are
obtained. This result is derived from the new model by using the interior
separation theorem which was established by T. Ma and S. Wang in
\cite{TM-SW1,TM-SW3}. The most important application of this result is to
predict when and where tornado and hurricane will occur.

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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
6
The categories of this paper are: astro-ph
14
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: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: dg-ga