The CAD model of the static mixer was provided by Richard Morris. It was uploaded to SimScale in STEP format and the hex-dominant mesh operation for fluid flow analysis was used to generate the mesh.
For the simulation setup, the laminar, transient fluid flow analysis type in a addition to a passive scalar model for the oxygen was used. This means that the oxygen itself does not have an impact on the fluid flow but is transported with the flow. Also molecular diffusion effects are accounted for - however depending on the velocity field of the flow, it is often very small in comparison to the convective transport effects. Two seconds of the real flow have been computed which took around 5 hours on an 8-core machine. The image below shows the concentration of oxygen within the water flow after two seconds. One can see how the oxygen is distributed within the water flow through the blades of the mixer.
One can now see exactly how the oxygen is distributed downstream within the flow field and whether or not the distribution is homogeneously enough. At the same time the result fields allow the computation of the pressure drop across the static mixer. The image below shows a visualization of the pressure field in the flow domain.
In order to document all settings of the simulation and the results, the automatic report generation functionality of the SimScale platform was used. The report contains screenshots of all result fields from different angles as well as the detailed settings of the simulation setup.