@hannes_seifart, first example simulation is finished over here: https://www.simscale.com/projects/dheiny/str-mungsadapter_1 . I used an example setup for demo purposes - 0.2 m/s water inlet at the big inlet and pressure outlet for the small pipes (not sure how the device is operating). Find some first post-processing images below
During the simulation I was wondering why the device is designed like this? The first part slowly increases the flow cross section area, which hints to a low pressure drop, but then close the small pipes the flow cross section changes so significantly that a huge pressure drop is introduced. Why? Would be great to learn more.
Velocity field visualizations [m/s]
Pressure field visualization