Multi-Region error with ony one solid and other in avanced concepts

[castilla]

Probably the problem is the same as in this post:

Question about rotation

Hi @Ricardopg, I have set up my simulation here - Rotating Body | SimScale Workbench. Initially, I had issues with my mesh so I changed the mesh algorithm from Standard to Hex-dominant based off of what other users had mentioned in the forum. Having done that, when I try to run the simulation, I get the error, “A multi-region mesh was assigned - this analysis-type requires a single-region mesh.” I am pretty sure this is because I’m doing something wrong with the rotating zone, but I can’t seem …

I am testing it.