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[snappyHexMesh] snappyHexMesh : how to get "full hexa" mesh ? (do NOT generate pyramid, tetra, ...)

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Old   February 26, 2015, 12:38
Default snappyHexMesh : how to get "full hexa" mesh ? (do NOT generate pyramid, tetra, ...)
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FGH
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Franck HOUSSEN
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Hello,

With snappyHexMesh (or another OpenFOAM mesher ?), is it possible to get only hexa ? (ie, prevent generation of pyramid, tetra and others elements)

I am new to OpenFOAM. I looked into the documentation and tutorials to get basics cases running.
I need to generate a mesh made ONLY of hexa (the solver I use can only handle hexa). To get these specific mesh, I tried to prevent pyramid / tetra generation playing on mesh quality controls : I didn't succeed to get a "hexa only" mesh. I looked in the documentation and also here https://openfoamwiki.net/images/f/f0...SlidesOFW7.pdf without success.

Can somebody advice me some means to get a "hexa only" mesh ? (tuning ? controls ? stl definition ? other ?)

Thanks for help,

FGH

Note: I attached all what is needed to mesh the case
Attached Files
File Type: gz cubecut.tar.gz (2.1 KB, 10 views)
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Old   February 26, 2015, 12:56
Default blockMesh
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Bernhard Linseisen
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Dear Franck,

for this simple geometry I strongly suggest to use blockMesh! While this is often not the mesher of choice (it s**** for complex geometries), here it definitely would work perfectly!

Simply build your cube from two blocks, with one containing the cut and the other one being fully rectangular. I guess this way it should be a matter of 20 minutes or so even for a meshing newbie. Everything you need is available in the OpenFoam User Guide, so no worries about that minor challenge!

Cheers,
Bernhard

Edit: I did a short effort and built a blockMeshDict similar to what you probably want. You just have to change the dimensions of the points accordingly and name the different patches correctly. And of course the definition of how many cells you need in which directions are all yours. ;-)
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File Type: txt blockMeshDict.txt (1.6 KB, 21 views)

Last edited by Linse; February 26, 2015 at 13:13. Reason: Added small blockMeshDict-file
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Old   February 27, 2015, 05:01
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FGH
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Thanks for the suggestion : I've just tested it, and, it turns out to work fine.

Anyway, the "cubecut" case I attached is, in fact, a voluntary simplification of what I really need (and, for these cases, blockMesh will probably not work). Actually, I need to mesh "more complex" geometries where the cube would be cut by (more or less) curved surfaces : so, for a start, I cut the cube with a plane surface (if I get a correct behavior with this case, I guess I may get what I expect even if the cut is done slightly differently).

So I still need to mesh the cubecut in "full hexa" with snappyHexMesh. Is this possible maybe on playing with mesh quality controls ? Or even modifying a bit the code ?

FGH
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Old   February 27, 2015, 05:35
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Bernhard Linseisen
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Unfortunately I am not that versed with snappyHexMesh as to hex-exclusive meshing. Maybe it is possible, but I would not know...

As long as you stay with curved cuts: These are possible with blockMesh as well, although probably that is quite the limit of reasonable use of this tool...
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Old   April 20, 2016, 21:25
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Hi,
Did you find a way to get fully hex mesh ?
Thanks,
Mhrz
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