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

It is harder and it takes longer to provide support without full details.To speed up the process and quickly solve your issues this is a reminder to post as much information as you possibly can:

  • A description of the project and what you are trying to achieve
  • An description of what is happening, screenshots or error logs are helpful
  • [Important] Always provide a link to your project so that it is easy to find.

(delete this message before posting)

I am trying to simulate am axial fan with MRF. I have only two solids, one of them acting as Rotating Zone.

I get no error with the mesh, but when I try to simulate I get the error of Multi-Region with CFD simulation.
I am using one region for the “fluid”:
and the other for the MRF:

I don’t what can be the problem…
This is the linl to the project:

Best regards

Hey Robert, and thanks for using the forum!

Can you please try running your simulation with the Standard mesh algorithm?

Thank you for the answer
I tried. It worked, but the simulation diverged, and I suspect that is because the quality of the mesh os very low. I was trying with the hex-dominant, which usually makes better meshes for CFD.

Probably the problem is the same as in this post:

I am testing it.

I think the solution is to create a cell zone for the rotating region. Please do so by creating a mesh refinement, and setup similar to this:


Of course, set up the appropriate lengths.

In the Standard mesher, the cell zones are created automatically, but in the hex mesh you need to create it manually.