Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-local boundary conditions and internal gravity wave generation   This work focuses on the mathematical modeling of wave dynamics in a
stratified medium. Non-local absorbing boundary conditions are considered based
on the two following assumptions: (i) a linear theory can be applied at large
distances from perturbation sources; and (ii) there are no other sources of
wave disturbance outside the mixing zone in the stratified medium. The boundary
conditions considered in this paper allowed us to describe the diverging
internal gravity waves generated by the mixing region in a stratified medium.

12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph