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Mutli region meshing, where are the patches stored?

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Old   January 14, 2022, 17:44
Default Mutli region meshing, where are the patches stored?
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Kishan Shukla
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[New to OpenFoam] I am trying to simulate a concentric tube heat exchanger. I have created the mesh using snappyHexMesh and then used topoSet to divide the mesh into 3 regions (InnerFluid, Pipe and OuterFluid). I don't know why after splitting mesh regions it created patch InnerFluid_to_OuterFluid, but I am sure it has created the patch as it showed on terminal output and on paraview as well.
Now when I run chtMultiRegionFoam, I get following error:
Cannot find patchField entry for InnerFluid_to_OuterFluid
Where does splitMeshRRegions store the patches? I have checked constant/polyMesh/boundary it is not there. I think the patch data is stored in cellToRegion file (which is automatically created when splitting mesh)
Any help would be really appreciated
Thank You!
PS: I am attaching snappyHexMeshDict, blockMeshDict, topoSetDict if you need any other file please let me know
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Old   January 17, 2022, 03:42
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splitMeshRegions splits the mesh and creates news mesh regions stored in constant. So you have to look in constant/InnerFluid/polyMesh/boundary to check for the patches. (or processor*/constant/... if running in parallel)

When splitting the mesh, splitMeshRegions creates interfaces between each region using this syntax "InnerFluid_to_OuterFluid" and in the OuterFluid region you will find the corresponding patch: "OuterFluid_to_InnerFluid"

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Old   January 17, 2022, 04:30
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Kishan Shukla
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Thanks Yann for your response!
I have figured out the issue. My mesh was not refined enough and therefore some holes were created in the pipe hence leading to formation of OuterFluid_to_InnerFluid patches (which shouldn't have formed in the first place). By refining my issue is resolved (it is not creating OuterFluid_to_InnerFluid patches). Still don't know why it couldn't find the patch it created
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multiregion meshing, snappyhexmesh, splitmeshregions, toposetdict

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