(480d) Large Eddy Simulation of Particle Laden Flows

The effects of particle density and diameter on residence time distribution is predicted using large eddy simulations (LES). Unlike RANS approaches which only capture the mean flow, LES simulations capture the effects of mean flow and the flow turbulence on particle transport. This combination provides superior insights into (i) the flow physics driving particle motion, and (ii) the velocity/shear experienced by individual particles as they evolve through the system.

We begin with a brief introduction to the theory and implementation of LES simulation, fluid-particle dynamics, and particle-particle interactions. We then show how the approach can be used to model movement through agitated and non-agitated open systems. For particles interacting with a fully turbulent system, the effects of turbulence on particle dynamics can be linked predictably to the particle settling timescale. For particles interacting with partially turbulent systems, however, the dynamics are more nuanced and strongly informed by local flow conditions.