Indeed a very nice PDF you have there, super interesting!
The first project that came into my mind when clicking through the slides was one by @dheiny, namely the "Turbulent Flow Through A Cyclone Seperator" .
Although the geometry is not exactly as depicted in the PDF it is similar to that one you are trying to investigate.
Small hint: The project is dealing with a single-phase flow.
Luckily, you can upload your own geometry on our platform and work with the multiphase flow module. Other models/simulation types that you can use as an inspiration are:
Now I also have to tell you that the process of the so called “atomization” as mentioned in the PDF involving the change from a Continuous Flow to Ligaments/Droplets to the final state of just Droplets can not be done in SimScale anymore but you can give your vote here:
Vote for Discrete Phase Model
Maybe you can work with some simplifications just to see how the flow behaves inside your injector.
I hope I could help you a bit. @sjesu_rajendra might give you a bit more tips concerning your project.
Let me know how you want to proceed!
All the best!