TY - THES A1 - Mütter, Dominik T1 - Simulation of an OLOID Agitator with OpenFOAM for use in Bioprocesses N2 - Oloids are said to be very energy efficient stirrers, generating low shear rates while providing good mixing for small-to-medium-sized water bodies, which would make them optimal for decreasing energy cost in large installations as well as protecting shear-sensitive microorganisms. Yet oloids are relatively obscure and there are few works dealing with detailed analysis of their flow profile and comparison against standard stirrers. This work tries to add to this topic. In this thesis the potential of deploying oloid stirrers in bioprocesses and wastewater treatment in general is to be probed by computational fluid simulation and compared against a propeller and a Smith turbine (modification of a Rushton turbine). Parameters of interest are flow and pressure profile as well as shear stress. The results show that oloids have much lower shear at their surface compared to both propeller and Smith turbine. The flow is pulsating and in three dimensions, and while the results need verification, it seems like the oloid is well usable for agitation in ungassed bioprocesses, because it can mix a small water body at much lower stirrer speeds than rotating impellers. The application in an actively gassed vessel and whether it is usable for active gas dispersion has not been analysed. Based on data generated by others, the oloid can also be used efficiently as surface aerator in natural open water bodies. KW - Oloid CFD KW - OpenFOAM KW - Bioprocess mixing Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:1383-opus4-8905 ER -