Detailed multiphase flow simulations at multiple scales

云、河流输送的沙子、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，两个或两个以上的组分同时流动，其中至少有一个以气泡、颗粒或液滴的形式存在。云是在湍流中分散的许多微小的水滴或冰晶；在河流中，沙粒被水流携带。在化学及相关工业中，多相流有多种形式：气泡流（液体中的气泡）、悬浮流（气体或液体中的固体颗粒）、液-液分散流（两种不混溶的液体，如油和水，一种分散在另一种中）。除了多相流动之外，许多工业流动也是动荡的。相位之间复杂的相互作用和湍流是本研究计划的主题。它的动机是为了更好地理解、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.