Study of a Dissipative Particle Dynamics Based Approach for Modeling Suspensions
In this paper, a dissipative particle dynamics (DPD)-based approach for modeling suspensions is examined. A series of tests are applied comparing simulation results to well established theoretical predictions. The model recovers the dilute limit intrinsic viscosity prediction of Einstein and provides reasonable estimates of the Huggins coefficient for semidilute suspensions. At higher volume fractions, the DPD interactions are too weak to prevent overlaps of the rigid bodies. To approximate hard sphere systems in this packing regime, lubrication forces were added to the DPD algorithm. Results are compared with previous work using the Stokesian dynamics method and experimental data. Comparison of relative viscosity values determined from strain controlled shearing versus stress controlled shearing are given. The flow of spheroidal objects is considered. The rotation of a single spheroid under shear is consistent with the predictions of Jeffery. Simulations of sheared spheroids at higher volume fractions produce a nematic phase. An example is given of application of the DPD algorithm to model flow in other goemetries, like gravitational driven flow between parallel cylinders, which is of practical interest.
Study of a Dissipative Particle Dynamics Based Approach for Modeling Suspensions, Journal of Rheology, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=860563
(Accessed February 21, 2024)