Student practical training / Bachelor theses / Master theses / Diploma theses / Student Assistant / Volunteer internship

CFD simulations of stratified flows are often conducted on the basis of the homogeneous model-based approach in which only one set of balance equations is considered. The different phases are taken into account by different material properties. Since only a velocity field is calculated leads to problems if the phases are not clearly separated, for example, if there is bubble entrainment in a wave or slug flow regime. The separation of the phases can then not be described properly.

To overcome this problem HZDR uses the Euler-Euler two-fluid approach for industrial macro-scale multiphase flow modeling. On both sides of the free surface, shear layers are expected which require a specific attention since complex phenomena with turbulent transfers coupled to possible interfacial waves take place. It was found necessary to be able to track the interface position in order to treat this zone in a similar way as a wall boundary layer using wall functions. When trying to use a two-fluid approach, the development of a morphology detection method was found necessary.

Therefore the Algebraic Interfacial Area Density (AIAD) model has been developed in close cooperation with ANSYS. This model is now available in ANSYS Fluent and has to be tested.

Studies in the field of process engineering/mechanical engineering/energy technology

• Interest in multiphase flows
• good written and spoken communication skills (German & English)
• Knowledge in the field of flow simulation with ANSYS Fluent advantageous

Start: immediately possible
Processing time: up to 8 months (depending on university regulations)
Application with curriculum vitae and certificates
Remuneration according to in-house remuneration rules