**Many-body dissipative particle dynamics simulation of liquid/vapor and
liquid/solid interactions**

M Arienti and WX Pan and XY Li and G Karniadakis, JOURNAL OF CHEMICAL PHYSICS, 134, 204114 (2011).

DOI: 10.1063/1.3590376

The combination of short-range repulsive and long-range attractive
forces in many-body dissipative particle dynamics (MDPD) is examined at
a vapor/liquid and liquid/solid interface. Based on the radial
distribution of the virial pressure in a drop at equilibrium, a
systematic study is carried out to characterize the sensitivity of the
surface tension coefficient with respect to the inter-particle
interaction parameters. For the first time, the approximately cubic
dependence of the surface tension coefficient on the bulk density of the
fluid is evidenced. In capillary flow, MDPD solutions are shown to
satisfy the condition on the wavelength of an axial disturbance leading
to the pinch-off of a cylindrical liquid thread; correctly, no pinch-off
occurs below the cutoff wavelength. Moreover, in an example that
illustrates the cascade of fluid dynamics behaviors from potential to
inertial-viscous to stochastic flow, the dynamics of the jet radius is
consistent with the power law predictions of asymptotic analysis. To
model interaction with a solid wall, MDPD is augmented by a set of bell-
shaped weight functions; hydrophilic and hydrophobic behaviors,
including the occurrence of slip in the latter, are reproduced using a
modification in the weight function that avoids particle clustering. The
dynamics of droplets entering an inverted Y-shaped fracture junction is
shown to be correctly captured in simulations parametrized by the Bond
number, confirming the flexibility of MDPD in modeling interface-
dominated flows. (C) 2011 American Institute of Physics. **doi:
10.1063/1.3590376**

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