Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Free surface flow through rigid porous media -- An overview and
  comparison of formulations   In many applications free surface flow through rigid porous media has to be
modeled. Examples refer to coastal engineering applications as well as
geotechnical or biomedical applications. Albeit the frequent applications,
slight inconsistencies in the formulation of the governing equations can be
found in the literature. The main goal of this paper is to identify these
differences and provide a quantitative assessment of different approaches.
Following a review of the different formulations, simulation results obtained
from three alternative formulations are compared with experimental and
numerical data. Results obtained by 2D and 3D test cases indicate that the
predictive differences returned by the different formulations remain small for
most applications, in particular for small porous Reynolds number ReP < 5000.
Thus it seems justified to select a formulation that supports an efficient
algorithm and coding structure.

11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin