A two-component two-phase dissipative particle dynamics model. (English) Zbl 1394.76104
Summary: Dissipative particle dynamics (DPD)-based models for two-phase flows are attractive for simulating fluid flow at the sub-micron level. In this study, we extend a DPD-based two-phase model for a single-component fluid to a two-component fluid. The approach is similar to that employed in the DPD formulation for two immiscible liquids. Our approach allows us to control the density ratio of the liquid phase to the gas phase, which is represented independently by the two components, without changing the temperature of the liquid phase. To assess the accuracy of the model, we carry out simulations of Rayleigh-Taylor instability and compare the penetration rates of the spikes and bubbles formed during the simulations with prior results reported in the literature. We show that the results are in agreement with both experimental data and predictions from Youngs’ model. We report these results for a broad range of Atwood numbers to illustrate the capability of the model.
Keywords:
dissipative particle dynamics; molecular dynamics; particle methods; micro- and nano-scale flows; multiphase flows; interfacial instabilityReferences:
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