[cypress90]

Hello!

I'm simulating a surface piercing propeller by using tutorial->MultiPhase->interPhaseChangeDyMFoam.

I use a Mesh file (.msh) for the geometry of the propeller and I convert it to Foam format by using Fluent3DMeshToFoam. And I also disable propeller movement (commented all lines in DynamicMeshDict and write "dynamicFvMesh staticFvMesh").

But the solver still diverges. and the Courant number increase sharply but suddenly decrease sharply. I tried different methods but I didn't get any results.

log.interPhaseChangeDyMFoam is attached.I would be grateful if you could help me.Thank you for taking this into consideration.

Bests,
Leila

[wyldckat]

Quick answer: My guess is that the problem is the mesh itself has very small cells where the fluid is the fastest, hence this being part of the problem.

My suggestion is that you use yourself an isolate and conquer approach to solve this, otherwise someone else will have to do it for you. For example:

1. Reduce the flow velocity to something fairly slow and see where it may still have problems.
2. AMI is being used and also the solver interPhaseChangeDyMFoam is being used. Drop those two and use instead the non-dynamic mesh solver interPhaseChangeFoam. Because this could be a problem related to how and where the AMI surface was defined or perhaps the solver itself might have some flaw that your case is triggering.