| 초록 |
We developed a new numerical algorithm for mesoscale simulation of polymeric systems in microchannel. We coupled the microscopic polymer model and macroscopic velocity field. The extra stress term from microscopic viscoelastic model was used in solving conservation equations, and the velocity field is used in calculating the extrea stress of polymer. Also, anisotropic drag force and anisotropic Brownian force were applied in order to consider the interaction between polymer and the wall in microfluidic channel. DEVSS-G/DG method was used for a stabilization of this algorithm, and adaptive semi-implicit predictor-corrector method was used for high efficiency and accuracy. Under strong anisotropic drag, some individual polymers were found to undergo tumbling and we investigated the relationship among the acting forces and their roles on the molecular tumbling. Through the micro-macro approach, we studied the averaged configuration and individual configuration of polymer at the same time in various flow conditions and polymer properties. This algorithm will be effective for diverse flow simulation of complex fluids, especially for precision molding. |
