Detailed multiphase flow simulations at multiple scales

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Clouds, transport of sand by rivers, chemical reactors producing polystyrene particles, and aerated bioreactors are examples of dispersed multiphase flow. In dispersed multiphase flows, two or more components are flowing simultaneously, with at least one of them being in the form of bubbles, particles, or droplets. Clouds are a great many tiny water droplets or ice crystals dispersed in a turbulent air flow; in rivers sand particles are carried by a water flow. In the chemical and related industries, multiphase flows come in a great variety: bubbly flows (gas bubbles in liquid), suspensions (solid particles in gas or liquid), liquid-liquid dispersions (two immiscible liquids like oil and water, one dispersed in the other). On top of being multiphase, many industrial flows are also turbulent. The complex interplay between the phases, and the turbulence is the subject of this research proposal. It is motivated by the desire to better understand, control, and design industrial processes.