[mesh manipulation] PolyDualMesh not working properly

Tobi · June 2, 2017, 18:58

Hey everybody,

I try to convert a tetraeder mesh (Salome - Netgen 3D/2D) into a polygon mesh using the utility polyDualMesh. The application runs nice but checkMesh gives errors. Does anybody know if it is working with all tetreader meshes? I also found this thread: https://www.cfd-online.com/Forums/op...h-utility.html and the corresponding foam wiki page but both were not helpful.

Some feedback would be nice.

hjasak · June 3, 2017, 06:17

Hi Tobi,

The converter will work only if your tet mesh is Delauney. Do you have a way to check that? (I know, I wrote the utility),

Hrv

Tobi · June 3, 2017, 07:41

Hi Hrv,

what a pleasure to get feedback from you. Thank you for your reply. The mesh was generated using Salome Meca (NETGEN 3D/2D). I will check if there is a possibility to check if the tetmesh is Delauney or even check out other algorithms that come with Salome.

Thank you in advance.

Tobi · June 3, 2017, 10:44

Hi Hrv,

you were right. I changed the parameters in Salome and got the result that I wanted to have now

- for those who are interested, you have to use NETGEN 3D-2D-1D in the 3D setup mask.

Now everything is fine. Thanks again.

philippose · June 3, 2017, 17:59

Hello Tobi, Hrv,
A good evening to both of you :-)

Just for some additional info, yes, meshes generated by Netgen are Delaunay meshes with pure tet elements.

Since the mesh was created from within Salome, there might have been a setting which somehow violated this, but if you were to create the mesh using the original Netgen code/api/gui, you would get a Delaunay mesh.

Wish you a good evening ahead.

Regards,
Philippose

kagen816 · April 26, 2019, 18:11

Quote:

Originally Posted by Tobi

Hey everybody,

I try to convert a tetraeder mesh (Salome - Netgen 3D/2D) into a polygon mesh using the utility polyDualMesh. The application runs nice but checkMesh gives errors. Does anybody know if it is working with all tetreader meshes? I also found this thread: https://www.cfd-online.com/Forums/op...h-utility.html and the corresponding foam wiki page but both were not helpful.

Some feedback would be nice.

Hi Tobi,

I am working on the polygon mesh by polyDualMesh recently, I want to convert the tetrahedral mesh in the hybrid mesh into polyhedral one, but after converting the mesh I run the checkMesh, and find the number of cells becomes more than 4 times . I just wander is there something wrong with the converting? Since the polygon mesh should be less than tetrahedral mesh.
Thank you!

June 2, 2017, 18:58	PolyDualMesh not working properly	#1
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Bad Wörishofen Posts: 2,716 Blog Entries: 6 Rep Power: 53	Hey everybody, I try to convert a tetraeder mesh (Salome - Netgen 3D/2D) into a polygon mesh using the utility polyDualMesh. The application runs nice but checkMesh gives errors. Does anybody know if it is working with all tetreader meshes? I also found this thread: https://www.cfd-online.com/Forums/op...h-utility.html and the corresponding foam wiki page but both were not helpful. Some feedback would be nice. Ramzy1990 likes this. __________________ Keep foaming, Tobias Holzmann Last edited by Tobi; June 3, 2017 at 10:45.

June 3, 2017, 06:17		#2
hjasak Senior Member Hrvoje Jasak Join Date: Mar 2009 Location: London, England Posts: 1,908 Rep Power: 34	Hi Tobi, The converter will work only if your tet mesh is Delauney. Do you have a way to check that? (I know, I wrote the utility), Hrv lourencosm, randolph and Ramzy1990 like this. __________________ Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk

June 3, 2017, 07:41		#3
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Bad Wörishofen Posts: 2,716 Blog Entries: 6 Rep Power: 53	Hi Hrv, what a pleasure to get feedback from you. Thank you for your reply. The mesh was generated using Salome Meca (NETGEN 3D/2D). I will check if there is a possibility to check if the tetmesh is Delauney or even check out other algorithms that come with Salome. Thank you in advance. Ramzy1990 likes this. __________________ Keep foaming, Tobias Holzmann

June 3, 2017, 10:44		#4
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Bad Wörishofen Posts: 2,716 Blog Entries: 6 Rep Power: 53	Hi Hrv, you were right. I changed the parameters in Salome and got the result that I wanted to have now - for those who are interested, you have to use NETGEN 3D-2D-1D in the 3D setup mask. Now everything is fine. Thanks again. lourencosm and Ramzy1990 like this. __________________ Keep foaming, Tobias Holzmann

June 3, 2017, 17:59		#5
philippose Senior Member Philippose Rajan Join Date: Mar 2009 Location: Germany Posts: 553 Rep Power: 26	Hello Tobi, Hrv, A good evening to both of you :-) Just for some additional info, yes, meshes generated by Netgen are Delaunay meshes with pure tet elements. Since the mesh was created from within Salome, there might have been a setting which somehow violated this, but if you were to create the mesh using the original Netgen code/api/gui, you would get a Delaunay mesh. Wish you a good evening ahead. Regards, Philippose Tobi, lourencosm and Ramzy1990 like this.

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