Rheology of sheared bidisperse and polydisperse suspension of hard spheres

In the past numerous studies have been conducted on the rheology of suspensions. It has been shown that including the interparticle friction and roughness on the particle surface is crucial to numerically reproduce many of the experimentally observed effects (e.g. shear thickening) in concentrated suspensions. Considering these observations, the aim of this study is to systematically study the effects of roughness and friction on the rheology of concentrated bi and polydisperse suspensions. We utilize resistance formulation to model the hydrodynamic interactions. Contact forces arising due to roughness and friction are modelled as in Discrete Element Method (DEM), a popular method in granular physics. In this talk, we will be presenting the results of these simulations.