Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Achieving tunable surface tension in the pseudopotential lattice
  Boltzmann modeling of multiphase flows   In this paper, we aim to address an important issue about the pseudopotential
lattice Boltzmann (LB) model, which has attracted much attention as a
mesoscopic model for simulating interfacial dynamics of complex fluids, but
suffers from the problem that the surface tension cannot be tuned independently
of the density ratio. In the literature, a multi-range potential was devised to
adjust the surface tension [Sbragaglia et al., Phys. Rev. E 75, 026702 (2007)].
However, it was recently found that the density ratio of the system will be
changed when the multi-range potential is employed to adjust the surface
tension. A new approach is therefore proposed in the present work. The basic
strategy is to add a source term to the LB equation so as to tune the surface
tension of the pseudopotential LB model. The proposed approach can guarantee
that the adjustment of the surface tension does not affect the mechanical
stability condition of the pseudopotential LB model, and thus provides a
separate control of the surface tension and the density ratio. Meanwhile, it
still retains the mesoscopic feature and the computational simplicity of the
pseudopotential LB model. Numerical simulations are carried out for stationary
droplets, capillary waves, and droplet splashing on a thin liquid film. The
numerical results demonstrate that the proposed approach is capable of
achieving a tunable surface tension over a very wide range and can keep the
density ratio unchanged when adjusting the surface tension.

28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga