[ariedinger]

Hello.

I need to merge all the internal faces of my geometry, but I am unable to do so with certain faces. I have learned (mainly in this thread) that mergePatchPairs doesn't allow duplicate vertices when trying to merge a face.

My geometry is not complex, but I do have 26 blocks defined (an image is atacched with the placing of each block). I managed to merge all the faces that don't have duplicate vertices with some other, and I have identified the problematic faces that I can't merge (commented inside mergePatchPairs).

The code as it is runs fine, blockMesh doesn't give any error and checkMesh looks good as well. But, as soon as I uncomment one of the problematic faces in mergePatchPair, I have the same error as in the mentioned thread:

Face xyz reduced to less than 3 point

Which is due to the fact that those commented faces share a vertice with an already merged face.

I have tested the following:

• Deleting the problematic faces inside the boundary section. This doesn't work because blockMesh still creates a "defaultFace" as the the internal face.
• Changing the slave and master face of the problematic faces inside mergePatchPairs. This has no effect whatsoever.
• Creating 6 boundaries (in total) with the vertices of multiple blocks; i.e., for the front boundary I've used the vertices (0 97 66 35), corresponding to blocks B1, B13 B9 and B5 respectively. The mergePatchPairs section was commented. With this, blockMesh gives the following error: face X in patch X does not have neighbour cell face.
• Creating a second mergePatchPairs function to deal with the faces with duplicate vertices. Although blockMesh compiles just fine, it ignores the first mergePatchPairs function and only implements the second.

So, I don't know if somebody has any idea how I can work around this problem, as I need all the internal faces of the geometry merged.

Thanks in advance.