Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermocapillary migration and interactions of two nondeformable droplets   A numerical study on interactions of two spherical drops in thermocapillary
migration in microgravity is presented. Finite-difference methods were adopted
and the interfaces of drops were captured by the front-tracking technique. It
is found that the arrangement of drops directly influences their migrations and
interaction, and that the motion of one drop is mainly determined by the
disturbed temperature field because of the existence of the other drop.

23
The categories of this paper are: solv-int
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The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph