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[mesh manipulation] How to handle extra domain creation from splitMeshRegions?

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Old   March 31, 2021, 06:10
Default How to handle extra domain creation from splitMeshRegions?
Sunag R A
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Location: Bangalore, India
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Dear All,

I have created a stl mesh using open3D from point cloud. This mesh was split into two domains as a patch and then added back using "surfaceAdd". Now, this mesh is implemented into snappyHexMeshDict.

I mesh is running well. But, when I do splitMeshRegion after some topoSet addition, it creates multiple domains, where my cellZoneRegion has only two regions and I need only these two regions.

The multiple domains has only one 1 cell in it. How to handle those.? Can it be addressed somehow in ChangeDictionary (Since I am doing chtMultiRegionSimpleFoam). Or the only way is to change the mesh itself?

Below is the snippet of splitMeshRegion.

Region Cells
------ -----
0 457997
1 241
2 1
3 1
4 1

Region Zone Name
------ ---- ----
0 1 gland
1 0 tumor
2 -1 domain2
3 -1 domain3
4 -1 domain4

Any leads will be appreciated.

Sunag R A.
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Old   March 7, 2023, 05:23
Default Any solution?
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Atefeh T
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did you find a solution for this problem? I also get an extra region when I use the command splitMeshRegions -cellZones -overwrite , it says that it is a dummy file but when I want to run the simulation, openfoam asks for the information of the polymesh of this region which I dont want and I dont care!
BTW I should say that I use blockMesh and then snappyHexMesh -overwrite so my theory is that this extra region is probably related to the blockMesh region that is created initially which I want to get rid of for my simulation at the end.
Can anybody help me with this problem? how should I get rid of this extra region?!
Thank you in advance
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mesh 3d, openfoam, snappyhexmesh, splitmeshregions

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