Simulating the Rayleigh-Taylor instability in polymer fluids with dissipative particle dynamics

摘要: The Rayleigh-Taylor (RT) instability that occurs in the flow of polymer fluids is numerically investigated with dissipative particle dynamics (DPD) method at mesoscale level. For modeling two-phase flow, Flory-Huggins parameter introduced to model binary fluids. And chains are described by modified FENE depicts both elastic tension and repulsion between adjacent beads bond length as equilibrium one segment. Besides, a bead repulsive potential employed capture entanglements chains. Through our numerical simulation, we research behaviors RT fluid medium. Furthermore, also explore effects volume concentration, chain length, extensibility on evolution instability. These simulation results show increasing any parameters, extensibility, saturation spikes becomes longer, two have less mixture. On contrary, for case low or short chain, small easily split break up, pattern evolves into chaotic structure. observations indicate its properties drastically modify pattern.