Euler-Euler Multiphase Flow Simulation @ HZDR

Research on multiphase flows has a long history at Helmholtz-Zentrum Dresden - Rossendorf. Concerning simulations we focus on the Euler-Euler method, which facilitates CFD simulations on the scale of technical equipment by applying the two-fluid framework of interpenetrating continua. Since phenomena occurring on the scale of individual bubbles or groups thereof are not resolved in this approach, accurate numerical predictions rely on suitable closure relations describing the physics of these small-scale phenomena. Development and validation of such closure relations are a core focus of our research.
A brief general overview of topics and methods will be given, followed by a collection of specific application examples. The latter center around dispersed multiphase flows in different types of equipment commonly encountered in chemical engineering, minerals processing, and biotechnology. The fluid dynamics of bubbly flow are covered in greater detail highlighting the modeling of bubble forces, bubble-induced turbulence as well as bubble-coalescence and breakup. Less comprehensive results are shown for reactive mass-transfer and particulate flows.