[snappyHexMesh] snappyHexMesh meshed inside an outside of stl

bastil · March 22, 2015, 10:38

Hello all,

I have a complex stl-geometry which I want to mesh using sHM. The geometry is captured fine. However, it meshes not just inside the geometry (as desired) but also parts of the outside. I guess there is at least one hole in the geometry... The surface extracted after the castellated phase looks correct. What ways are there to find the connection paths between inside and outside? Maybe giving two point one inside and one outside and find the path between them? Thanks.

jhoepken · March 24, 2015, 05:09

I think you guessed correctly: the geometry is most likely to have a hole. Run surfaceCheck on the stl file and check. If no hole is detected, try to move locationInMesh to a different position, not on a geometry face or cell face.

thomas. · May 6, 2016, 13:00

Hello all,

I actually need to mesh both inside and outside parts of an .stl-file. How can I do it? I want to use the internal mesh as an volumetric heat source, so that the fluid that goes through those cells gets heated (buoyancy case). I want to try it this way because I will export the mesh to Fluent and then set the internal mesh as an "heat source cell zone".

Thank you very much in advance.

thomas. · May 6, 2016, 13:12

I added three images in order to visualize what I mean. In the "inside" picture you see a long thin cylinder. That's supposed to be the volumetric heat source. The fluid is supposed to go through it in order to get warmer.

Antimony · May 7, 2016, 13:11

Hi,

Refer to slide 31 in this presentation:

http://openfoamwiki.net/images/f/f0/...SlidesOFW7.pdf

By setting cellZoneInside to inside, you will be meshing the interior of the STL. Furthermore, by specifying names of faceZone and cellZone (which you can convert to cellSet via topoSet), you can specify the region where your heat source should act.

Hope this helps.

Cheers,
Antimony

thomas. · May 7, 2016, 17:12

Thank you very much! I will give it a try.

March 22, 2015, 10:38	snappyHexMesh meshed inside an outside of stl	#1
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 530 Rep Power: 20	Hello all, I have a complex stl-geometry which I want to mesh using sHM. The geometry is captured fine. However, it meshes not just inside the geometry (as desired) but also parts of the outside. I guess there is at least one hole in the geometry... The surface extracted after the castellated phase looks correct. What ways are there to find the connection paths between inside and outside? Maybe giving two point one inside and one outside and find the path between them? Thanks.

March 24, 2015, 05:09		#2
jhoepken Senior Member Jens Höpken Join Date: Apr 2009 Location: Duisburg, Germany Posts: 159 Rep Power: 17	I think you guessed correctly: the geometry is most likely to have a hole. Run surfaceCheck on the stl file and check. If no hole is detected, try to move locationInMesh to a different position, not on a geometry face or cell face. __________________ Blog: sourceflux.de/blog "The OpenFOAM Technology Primer": sourceflux.de/book Twitter: @sourceflux_de Interested in courses on OpenFOAM?

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May 6, 2016, 13:00		#3
thomas. Member thomas Join Date: Jul 2014 Posts: 50 Rep Power: 12	Hello all, I actually need to mesh both inside and outside parts of an .stl-file. How can I do it? I want to use the internal mesh as an volumetric heat source, so that the fluid that goes through those cells gets heated (buoyancy case). I want to try it this way because I will export the mesh to Fluent and then set the internal mesh as an "heat source cell zone". Thank you very much in advance.

May 7, 2016, 13:11		#5
Antimony Senior Member Join Date: Aug 2013 Posts: 407 Rep Power: 16	Hi, Refer to slide 31 in this presentation: http://openfoamwiki.net/images/f/f0/...SlidesOFW7.pdf By setting cellZoneInside to inside, you will be meshing the interior of the STL. Furthermore, by specifying names of faceZone and cellZone (which you can convert to cellSet via topoSet), you can specify the region where your heat source should act. Hope this helps. Cheers, Antimony

May 7, 2016, 17:12		#6
thomas. Member thomas Join Date: Jul 2014 Posts: 50 Rep Power: 12	Thank you very much! I will give it a try.