[mesh manipulation] Create patches from a very complex geometry

CoSponge · January 8, 2015, 07:47

Hello everybody,

I am wondering if it is possible to create patches and different region automatically from a .stl file.

For a simple geometry I tried to isolate the faces belonged to the different regions I'd like to have in the .stl file manually. It works perfectly

But now I have a very complex geometry, isolating the region is impossible by hand.

AutoPatch doesn't work, because it isolates some single points as a region (the mesh is not perfect) or the whole geometry, depending on the angle.

I know I could do it with the tool createPatches or making different blockMesh regions for each patch.

Does anyone knows the best option??

Thanks in avdance for the help,

Julie

student666 · January 11, 2015, 17:57

Have you tried topoSet dict?

SurfaceToCell allows you to exctract cellSet from a stl file, then you can turn it into a patch with topoSet as well, try have a look here.
https://openfoamwiki.net/index.php/TopoSet
Bye

CoSponge · January 12, 2015, 05:39

Hi,

thank you a lot for the reply!!!
Can I ask you to explane me topoSet? For example, what is the difference between faceSet, cellSet, ecc? I mean, do they work one after the other or do I have to choose?
I'm a bit confused...

Cheers,

Julie

student666 · January 13, 2015, 04:33

Toposet is a dictionary that allows you to define into your polymesh folder a set of faces, points, ecc..or faceZone, cellZone as well.
You're not supposed to follow a hierarchical path, so if you need to define a set of faces, you have not to define a set of points previously.

My fault on my previously post, I think you'll have to use createPatch dict after you defined faceSets.

So the workflow should be:
first you define your face sets with topoSet
Second you use createPatch to define the patches for you purpose.

If you still have confusion what faceSet, cellSet, pointSet are, think they are a collection of entities.

Bye

CoSponge · January 14, 2015, 12:35

Perfect, it works

Thanks a lot!!

Alex Lee · June 9, 2015, 08:51

Dear all,

Does any one know how to create a cyclic (circular) patch to mimic a pressure jump in the T-Junction tutorial using a STL patch ?

Thanks.

Alex Lee

January 8, 2015, 07:47	Create patches from a very complex geometry	#1
CoSponge New Member Julie Correncon Join Date: Oct 2014 Posts: 7 Rep Power: 11	Hello everybody, I am wondering if it is possible to create patches and different region automatically from a .stl file. For a simple geometry I tried to isolate the faces belonged to the different regions I'd like to have in the .stl file manually. It works perfectly But now I have a very complex geometry, isolating the region is impossible by hand. AutoPatch doesn't work, because it isolates some single points as a region (the mesh is not perfect) or the whole geometry, depending on the angle. I know I could do it with the tool createPatches or making different blockMesh regions for each patch. Does anyone knows the best option?? Thanks in avdance for the help, Julie

January 12, 2015, 05:39	Hi, thank you a lot for the reply!!!	#3
CoSponge New Member Julie Correncon Join Date: Oct 2014 Posts: 7 Rep Power: 11	Hi, thank you a lot for the reply!!! Can I ask you to explane me topoSet? For example, what is the difference between faceSet, cellSet, ecc? I mean, do they work one after the other or do I have to choose? I'm a bit confused... Cheers, Julie

January 14, 2015, 12:35	Perfect, it works ;)	#5
CoSponge New Member Julie Correncon Join Date: Oct 2014 Posts: 7 Rep Power: 11	Perfect, it works Thanks a lot!!

June 9, 2015, 08:51	Fan modelling	#6
Alex Lee New Member Alex Lee Join Date: Sep 2012 Posts: 15 Rep Power: 13	Dear all, Does any one know how to create a cyclic (circular) patch to mimic a pressure jump in the T-Junction tutorial using a STL patch ? Thanks. Alex Lee

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January 11, 2015, 17:57		#2
student666 Senior Member M. C. Join Date: May 2013 Location: Italy Posts: 286 Blog Entries: 6 Rep Power: 16	Have you tried topoSet dict? SurfaceToCell allows you to exctract cellSet from a stl file, then you can turn it into a patch with topoSet as well, try have a look here. https://openfoamwiki.net/index.php/TopoSet Bye

January 13, 2015, 04:33		#4
student666 Senior Member M. C. Join Date: May 2013 Location: Italy Posts: 286 Blog Entries: 6 Rep Power: 16	Toposet is a dictionary that allows you to define into your polymesh folder a set of faces, points, ecc..or faceZone, cellZone as well. You're not supposed to follow a hierarchical path, so if you need to define a set of faces, you have not to define a set of points previously. My fault on my previously post, I think you'll have to use createPatch dict after you defined faceSets. So the workflow should be: first you define your face sets with topoSet Second you use createPatch to define the patches for you purpose. If you still have confusion what faceSet, cellSet, pointSet are, think they are a collection of entities. Bye