Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A MHD reverse flow in 90 degree bend   A two-dimensional flow in a 90 degree bent channel is considered. A magnetic
field is uniform and parallel to inlet branch of the channel. A spectral/hp
element method was used for liquid motion calculations. Three types of steady
flows were detected. It was found that magnetic forces can suppress a pressure
gradient and throw out liquid from the inlet, a relatively large reverse flow
appears.

8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys