Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Searching optimal shape in viscous flow: its dependence on Reynolds
  number   In this work a simple problem on 2D optimal shape for body immersed in a
viscous flow is analyzed. The body has geometrical constraints and its profile
would be found in the class of cubics which satisfy those conditions. The
optimal profile depends on the leading coefficient of these cubics and its
relation with the Reynolds number of the system is found. The solution to the
problem uses a method based on a suitable transformation rule for the cartesian
reference.

30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph