Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A numerical study of a two-layer model for the growth of granular matter
  in a silo   The problem of filling a silo of given bounded cross-section with granular
matter can be described by the two-layer model of Hadeler and Kuttler [8]. In
this paper we discuss how similarity quasi-static solutions for this model can
be numerically characterized by the direct finite element solution of a
semidefinite elliptic Neumann problem. We also discuss a finite difference
scheme for the dynamical model through which we can show that the growing
profiles of the heaps in the silo evolve in finite time towards such similarity
solutions.

23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas