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Are overlapping overset boundaries a problem in openFoam?

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Old   January 31, 2024, 13:39
Default Are overlapping overset boundaries a problem in openFoam?
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Dear all,

I have a question that is strongly blocking me.

I'm trying to set up an overset simulation (overPimpleDyMFoam) in which there are 4 zones (1 background and 3 different overset regions with different associated motions).

Since, for me, this kind of set up is pretty demanding, I decided to approach the simulation step by step.
First, I have done three different test cases with only 2 zones (background+1 of the three overset meshes). Everything, here, looks fine. The results are in good accordance with the physics and I'm pretty happy about them.Then, when I try to combine the different overset meshes, my simulation diverges: at the moment I'm stuck trying to simulate a case with 3 mesh regions (the background+2 overset meshes).

These 2 overset boundaries have an overlap (their respective holes do not intersect). So, I was thinking that maybe the problem is related on how openFoam deals with 2 overlapping overset regions.
Apparently, this should not be the case, since I followed the very same procedure showed in the twoSimpleRotors tutorial (where there are teo overlapping overset boundaries and this problem doesn't appear) but I am not sure.
Maybe I am missing something that is really important for overset overlaps or do I have to treat in a special manner the boundaries since they are 3D.

Has anyone encountered the same issue? If yes, do you know how to solve it?
Please let me know if you need further information to help me.
Thank you in advance to everyone!
Enrin
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overlapping grid, overset

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