Coarse-grained computations of demixing in dense gas-fluidized beds
  We use an "equation-free", coarse-grained computational approach to accelerate molecular dynamics-based computations of demixing (segregation) of dissimilar particles subject to an upward gas flow (gas-fluidized beds). We explore the coarse-grained dynamics of these phenomena in gently fluidized beds of solid mixtures of different densities, typically a slow process for which reasonable continuum models are currently unavailable. 
Sung Joon Moon, S. Sundaresan, I. G. Kevrekidis