[mesh manipulation] mergePatchPairs with multiple areas

bjoern1 · September 22, 2015, 03:50

Hi together!

I try to use mergePatchPairs to arrange a block-structured grid.
It looks somehow like this:

block2 | block5 |block4
------------------------------------
block1 | oldBlock |block3
-------------(sym.)---------------

The idea is that the blocks 1-5 have a coarser grid.
When I use mergePatchPairs like this

Code:

mergePatchPairs
(
(oldInlet A1East)
(oldOutlet A3West)
(oldTopbottom A5South)
)

I get the following error:

Code:

--> FOAM FATAL ERROR: 
Duplicate point found in cut face. Error in the face cutting algorithm for global face 4(9160 9164 9165 9161) local face 4(13 12 18 19)
Slave size: 25 Master size: 228 index: 10.

I think its because of the edges marked with an "x" in the following picture:

block2 | block5 |block4
----------x--------------x----------
block1 | oldBlock |block3
-------------(sym.)---------------

Can someone help me out? I searched the forum but didnt really find an answer. Is it possible to run mergePatchPairs twice?

Thanks a lot in advance!

Björn

bjoern1 · October 1, 2015, 08:07

Just in case that somebody has similar problems. My work-around was the following: I merged the oldBlock, block1 and block3 with mergePatchPairs. Then I created a new case with block2, block5 and block4 and used mergeMeshes and stitchMesh to stitch the both cases together. In another case I used AMI boundaries to create the mesh.

September 22, 2015, 03:50	mergePatchPairs with multiple areas	#1
bjoern1 New Member Björn N. Join Date: Jun 2013 Posts: 11 Rep Power: 13	Hi together! I try to use mergePatchPairs to arrange a block-structured grid. It looks somehow like this: block2 \| block5 \|block4 ------------------------------------ block1 \| oldBlock \|block3 -------------(sym.)--------------- The idea is that the blocks 1-5 have a coarser grid. When I use mergePatchPairs like this Code: mergePatchPairs ( (oldInlet A1East) (oldOutlet A3West) (oldTopbottom A5South) ) I get the following error: Code: --> FOAM FATAL ERROR: Duplicate point found in cut face. Error in the face cutting algorithm for global face 4(9160 9164 9165 9161) local face 4(13 12 18 19) Slave size: 25 Master size: 228 index: 10. I think its because of the edges marked with an "x" in the following picture: block2 \| block5 \|block4 ----------x--------------x---------- block1 \| oldBlock \|block3 -------------(sym.)--------------- Can someone help me out? I searched the forum but didnt really find an answer. Is it possible to run mergePatchPairs twice? Thanks a lot in advance! Björn

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October 1, 2015, 08:07		#2
bjoern1 New Member Björn N. Join Date: Jun 2013 Posts: 11 Rep Power: 13	Just in case that somebody has similar problems. My work-around was the following: I merged the oldBlock, block1 and block3 with mergePatchPairs. Then I created a new case with block2, block5 and block4 and used mergeMeshes and stitchMesh to stitch the both cases together. In another case I used AMI boundaries to create the mesh.