Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Steady Prandtl Boundary Layer Expansion of Navier-Stokes Flows over a
  Rotating Disk   This paper concerns the validity of the Prandtl boundary layer theory for
steady, incompressible Navier-Stokes flows over a rotating disk. We prove that
the Navier Stokes flows can be decomposed into Euler and Prandtl flows in the
inviscid limit. In so doing, we develop a new set of function spaces and prove
several embedding theorems which capture the interaction between the Prandtl
scaling and the geometry of our domain.

29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th