Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elasto-plastic flow of a foam around an obstacle   We simulate quasistatic flows of an ideal two-dimensional monodisperse foam
around different obstacles, both symmetric and asymmetric, in a channel. We
record both pressure and network contributions to the drag and lift forces, and
study them as a function of obstacle geometry. We show that the drag force
increases linearly with the cross section of an obstacles. The lift on an
asymmetric aerofoil-like shape is negative and increases with its arc length,
mainly due to the pressure contribution.

34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc