Rouse model with fluctuating internal friction

A coarse-grained bead-spring-dashpot chain model with the dashpots representing presence of internal friction is solved exactly numerically for case chains more than two beads. Using a decoupling procedure to remove explicit coupling bead’s velocity that its nearest neighbors, governing set stochastic differential equations are Brownian dynamics simulations obtain material functions in oscillatory and steady simple shear flow. Simulation results real imaginary components complex viscosity have been compared previously derived semi-analytical approximations, difference predictions seen diminish an increase number beads chain. The inclusion nonmonotonous variation rate, occurrence continuous shear-thickening following initial shear-thinning regime. onset first normal stress coefficient pushed lower rates parameter.