Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A phase field approach to no slip boundary conditions in dissipative
  particle dynamics and other particle models for fluid flow in geometrically
  complex confined systems   Dissipative particle dynamics (DPD) is an effective mesoscopic particle model
with a lower computational cost than molecular dynamics because of the soft
potentials that it employs. However, the soft potential is not strong enough to
prevent the DPD particles that are used to represent the fluid from penetrating
solid boundaries represented by stationary DPD particles. A phase field
variable, , is used to indicate the phase at point and time t, with a smooth
transition from -1 (phase 1) to +1 (phase 2) across the interface. We describe
an efficient implementation of no-slip boundary conditions in DPD models that
combines solid-liquid particle-particle interactions with reflection at a sharp
boundary located with subgrid scale accuracy using the phase field. This
approach can be used for arbitrarily complex flow geometries and other similar
particle models (such as smoothed particle hydrodynamics), and the validity of
the model is demonstrated by DPD simulations of flow in confined systems with
various geometries.

36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
9
The categories of this paper are: nlin