Detailed multiphase flow simulations at multiple scales

云、河流中的沙、产生聚苯乙烯颗粒的化学反应器和曝气生物反应器都是分散多相流的例子。在分散的多相流中，两种或更多种组分同时流动，其中至少一种是气泡、颗粒或液滴的形式。云是大量微小的水滴或冰晶分散在湍流中;在河流中，沙粒由水流携带。在化学和相关工业中，多相流有很多种：气泡流（液体中的气泡），悬浮液（气体或液体中的固体颗粒），液-液分散体（两种不混溶的液体，如油和水，一种分散在另一种中）。除了多相性之外，许多工业流动也是湍流的。相和湍流之间复杂的相互作用是本研究提案的主题。它的动机是希望更好地理解，控制和设计工业过程。

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.