Euler-Euler CFD Modelling for Multiphase Flows

Computational Fluid Dynamics (CFD) becomes more and more important for industrial process design and optimisation as well as analyses related to safety issues. While CFD is an established tool for single phase flows, e.g. in automotive or aviation industries, it is not yet mature for multiphase flows. The main reason is the complexity and multiscale nature of the interactions between the phases.
For medium and large industrial scales, as they are typical for nuclear reactor safety research, the multi-fluid or Euler-Euler approach is most frequently used and often the only feasible one. It allows for relative large sizes of the numerical cells, but has the price that all the unresolved phenomena have to be considered by closure models. The accuracy of these closure models is still limited because of a lack of knowledge and data for the small scale phenomena of multiphase flows.
The lecture will focus on gas-liquid flows and present strategies to 1) improve the reliability of Euler-Euler-CFD simulations and 2) extent the range of applicability of CFD by considering different morphologies of multiphase flows and allowing for transitions between these morphologies.