[mesh manipulation] Automatically delete empty patches from boundary file after stitchMesh

g_b · November 21, 2012, 02:08

Hello foamers,

I was wondering if there is a straightforward/out-of-the-box way to automatically delete empty patches from the boundary file after a successful stitchMesh? Although pyFoam has a utility to add empty patches to the boundary file, I haven't found any to remove them.

Thanks!

mturcios777 · November 21, 2012, 12:59

I know createPatch removes empty boundaries; try grouping all the empty patches together and see if createPatch will remove them.

vishalsacharya · November 23, 2012, 23:37

renumberMesh also sometimes does that... but i may be mistaken... its a good idea to renumber after stitching to get the most optimal mesh for decomposition...

rcastilla · February 27, 2013, 12:00

I think that the problem is that the boundary is in the 0/polyMesh directory instead of in the constant/polyMesh one. Move the 0/polyMesh directory into constant (overwrite the old one) and run pyFoamClearEmptyBoundary again. It worked for me

Gerhard · November 23, 2020, 07:37

createPatch with no entries under patches in the createPatchDict file will always remove zero-sized patches.
You do not even have to group them together.

Regards

November 21, 2012, 02:08	Automatically delete empty patches from boundary file after stitchMesh	#1
g_b New Member Gabriel Join Date: Sep 2011 Posts: 1 Rep Power: 0	Hello foamers, I was wondering if there is a straightforward/out-of-the-box way to automatically delete empty patches from the boundary file after a successful stitchMesh? Although pyFoam has a utility to add empty patches to the boundary file, I haven't found any to remove them. Thanks!

February 27, 2013, 12:00		#4
rcastilla Senior Member Robert Castilla Join Date: Apr 2009 Location: Spain Posts: 109 Rep Power: 17	I think that the problem is that the boundary is in the 0/polyMesh directory instead of in the constant/polyMesh one. Move the 0/polyMesh directory into constant (overwrite the old one) and run pyFoamClearEmptyBoundary again. It worked for me yanxiang likes this.

November 23, 2020, 07:37		#5
Gerhard New Member Gerhard Join Date: Mar 2017 Posts: 26 Rep Power: 9	createPatch with no entries under patches in the createPatchDict file will always remove zero-sized patches. You do not even have to group them together. Regards salehi144 likes this.

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November 21, 2012, 12:59		#2
mturcios777 Senior Member Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 740 Rep Power: 28	I know createPatch removes empty boundaries; try grouping all the empty patches together and see if createPatch will remove them.

November 23, 2012, 23:37		#3
vishalsacharya Member Vishal Achasrya Join Date: Nov 2011 Posts: 38 Rep Power: 14	renumberMesh also sometimes does that... but i may be mistaken... its a good idea to renumber after stitching to get the most optimal mesh for decomposition...