Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An improved multicomponent pseudopotential lattice Boltzmann method for
  immiscible fluid displacement in porous media   Immiscible fluid displacement in porous media occurs in several natural and
industrial processes. For example, during petroleum extraction from porous rock
reservoirs, water is used to displace oil. In this paper, we investigate
primary drainage and imbibition in a heterogeneous porous medium using an
improved numerical model based on the multicomponent pseudopotential lattice
Boltzmann method. We apply recent developments from the literature and develop
new pressure boundary conditions. We show that the proposed model is able to
simulate realistic viscosity ratios, and it allows independent tuning of
surface tension from viscosity. Moreover, the model suppresses a non-physical
behavior of previous schemes, in which trapped fluid volumes significantly
change with time. Furthermore, we show that the developed model correctly
captures the underlying physical phenomena of fluid displacements. We simulate
oil-water flows and verify that the measured values of irreducible water and
residual oil saturations are realistic. Finally, we vary the wetting conditions
of the porous medium to represent different wettability states. For the
different scenarios, we show that the simulations are in good agreement with
experimental results.

15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat