SIMULATIONS OF DISPERSED TURBULENT MULTIPHASE FLOW

Direct numerical simulations of homogeneous isotropic turbulence are u sed to investigate the effects of turbulence on the transport of parti cles in gas flows or bubbles in liquid flows. The inertia associated w ith the bubbles or the particles leads to locally strong concentration s of these in regions of instantaneously strong vorticity for bubbles or strain-rate for particles, This alters the average settling rates a nd other processes. If the mass-loading of the dispersed phase is sign ificant a random ''turbulent'' flow is generated by the particle settl ing. A simple demonstration of this is given, showing the statisticall y axisymmetric character of this flow and how it can modify an ambient turbulent flow.