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Unstructured 3D quad mesher for OpenFoam ?

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Old   September 3, 2012, 14:04
Default Unstructured 3D quad mesher for OpenFoam ?
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David Long
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i am new to OpenFoam. Since OF is very sensitive to mesh quality (I tried importing tet mesh into OF and it blows up very often due to bad mesh quality).

So i was wondering, is there any Open source tool for such function?

1) Tet mesh, easy to generate, but should make sure the mesh quality

2) Only 2D quad mesh is available

Last edited by keepfit; September 3, 2012 at 22:46.
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Old   September 3, 2012, 16:50
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Bruno Santos
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Greetings David,

This geometry seems rather simple... you could easily handle this with blockMesh or snappyHexMesh.
Suggestions:
Beyond tetrahedral or quad mesh, I would suggest polyhedral mesh. You can convert the tetrahedral mesh to polyhedral with polyDualMesh: http://openfoamwiki.net/index.php/PolyDualMesh

Best regards,
Bruno
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Old   September 3, 2012, 22:52
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David Long
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Quote:
Originally Posted by wyldckat View Post
Greetings David,

This geometry seems rather simple... you could easily handle this with blockMesh or snappyHexMesh.
Suggestions:
Beyond tetrahedral or quad mesh, I would suggest polyhedral mesh. You can convert the tetrahedral mesh to polyhedral with polyDualMesh: http://openfoamwiki.net/index.php/PolyDualMesh

Best regards,
Bruno
thanks for your reply.

This simple example is just used for testing tet meshing quality imported in OF. I know some commercial codes such as ANSYS and CUBIT are able to generate unstructured 3D quad mesh with high quality.

I will try snapHexMesh and polyDualmesh, otherwise I should have to import Fluent quad mesh (not familiar with it) into OF.
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Old   September 5, 2012, 07:25
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Elvis
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Hi,

if you are interested in smappyhexmesh there is a promissing GUI-tool (shm meshing & preprocessing under one hood) http://sourceforge.net/projects/helyx-os/

also http://engits.eu/en/engrid and Blender is nice for meshing & preprocessing

for a list of preprocessing opportunities (free & commercial) specially for OpenFOAM
http://openfoamwiki.net/index.php/GUI
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Old   September 5, 2012, 19:21
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Quote:
Originally Posted by elvis View Post
Hi,

if you are interested in smappyhexmesh there is a promissing GUI-tool (shm meshing & preprocessing under one hood) http://sourceforge.net/projects/helyx-os/

also http://engits.eu/en/engrid and Blender is nice for meshing & preprocessing

for a list of preprocessing opportunities (free & commercial) specially for OpenFOAM
http://openfoamwiki.net/index.php/GUI
thanks elvis.

I did try enGrid for a while. For coarse mesh enGrid does a good job. However, for fine mesh e.g 100k-1M cells generated by enGrid, it just does not pass the checkMesh in OF: big aspect ratio, skewness, etc, even though remeshed and optimized many times.

It sounds that snappyHexMesh and polyDualMesh are very reliable method to generate high quality mesh. If i get some results, I will post them here.

Cheers

David
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