Multiphase flows are characterized by the fact that a mixture of different media in different aggregate states often move at different velocities in the same space. The challenge is to describe the interaction of the two phases and to model the mostly temperature-dependent phase transition of the two material systems. Technical processes often require either the mixing or the separation of the two phases. This requires precise predictions of both the kinematics and the thermal behavior of both substances - be it in spray drying devices, coolant circuits of heat pumps or particle separation devices in flue gas ducts.

The following processes must be modeled in detail:

• Mixing/separation processes
• Phase transition / melting and evaporation processes / friction processes at phase boundaries
• Additive manufacturing processes such as 3D printing and build-up welding
• Nonlinear behavior of the material behavior of multiphase mixtures

The main areas of application include manufacturing processes in which, as in additive manufacturing or the infusion of resins in the production of carbon fiber composites, mostly liquid materials or solids to be thermally treated must be dosed and precisely positioned on the component immediately before the curing or drying process. When investigating burn-off processes, however, even the smallest flue gas particles often have to be detected or ash particles separated, for which the mostly size-dependent separation of the particles must be simulated.