I see, I think I might not have been clear in my previous messages, so I will write the process again:
Right not you have two parts in your CAD model:
- The MRF region cylinder
- The rotating blades
In your CAD software (not in SimScale) add a third part, which will represent the domain.
Upload your model to SimScale and enter the CAD mode. Then use the Subtract feature to remove the rotating blades from the Domain (only the domain, do not include the MRF region in this process).
At the end you should have the correct flow region, that will be void where the fins once were placed, and the intact MRF region.
Best regards,
Fillia