ACCURATE SIMULATION OF LINEAR VISCOELASTIC PROPERTIES BY VARIANCE REDUCTION THROUGH THE USE OF CONTROL VARIATES

An algorithm is demonstrated to yield accurate linear viscoelastic pro perties in a nonequilibrium stochastic simulation by variance reductio n. For noninteracting polymer dumbbells, multiple orders of magnitude improvements in computational accuracy for nonequilibrium viscoelastic properties are easily realized. This simple and robust control variat e scheme uses control variables defined as the viscoelastic properties obtained from a parallel, equilibrium simulation. Results for strongl y interacting colloidal particles demonstrate some advantages as well as limitations of the method. (C) 1997 The Society of Rheology.