A Dissipative Particle Dynamics model for two-phase flows

A Dissipative Particle Dynamics (DPD) model for two-phase flows is presented. The new model, unlike existing models [1, 2], uses different cut-off radii for the attractive and repulsive components of the inter-particle interaction potential and allows for larger density ratios between the phases. Surface tension arises due to the attractive component and a forcing term that depends on higher order density gradients. The model is shown to reproduce the Laplace law and analytical results for drop oscillations. A new method that couples a Lennard-Jones type potential with a coarse-grained potential is also presented. \newline \newline References: \newline [1] Pagonabarraga, I. and Frenkel, D. (2001). \textit{Journal of Chemical Physics, }115(11): 5015-5026. \newline [2] Warren, P.B. (2003). \textit{Physical Review E}\textbf{\textit{. }}68. 066702: 1-8.