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October 26, 2008, 04:42 |
Polymesh cells file missing
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#1 |
Member
fabrizio
Join Date: Mar 2009
Posts: 33
Rep Power: 17 |
Hi everybody I'm a new OF user, I have a problem and I hope someone can help me.
I have to import the results of my OF analysis in Calculix, but the operation fails because in the Polymesh directory the file 'cells' is missing. I've created the mesh in NetGen, converted with netgenNeutralToFoam but the 'cells' files isn't created. The OF simulation works fine. I've read the manual, I know how a cell is defined, but I can't build this file. Is there a way to create the 'cell' file? Thank you very much Fabrizio |
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October 27, 2008, 03:41 |
The proper solution is to fix
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#2 |
Senior Member
Mark Olesen
Join Date: Mar 2009
Location: https://olesenm.github.io/
Posts: 1,677
Rep Power: 40 |
The proper solution is to fix Calculix to read the owner/neighbour files. The cells file is a remnant from a much older OpenFOAM format.
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October 27, 2008, 10:40 |
Hi Mark thank for your advice.
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#3 |
Member
fabrizio
Join Date: Mar 2009
Posts: 33
Rep Power: 17 |
Hi Mark thank for your advice. Can you tell me the structure of cells file?I need to create this file because fixing Calculix to read owner and neighbour is quite difficult, and I'm not a master in modifying Calulix source.
Thank you Fabrizio |
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October 27, 2008, 12:23 |
Sorry, I don't know it off-han
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#4 |
Senior Member
Mark Olesen
Join Date: Mar 2009
Location: https://olesenm.github.io/
Posts: 1,677
Rep Power: 40 |
Sorry, I don't know it off-hand, but since it's a cellList (I think ... check the polyMesh source) it shouldn't be hard to create.
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October 27, 2008, 16:22 |
Had this lying around
http
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#5 |
Senior Member
Mattijs Janssens
Join Date: Mar 2009
Posts: 1,419
Rep Power: 26 |
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October 28, 2008, 04:38 |
Hi Mattijs
thank you very
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#6 |
Member
fabrizio
Join Date: Mar 2009
Posts: 33
Rep Power: 17 |
Hi Mattijs
thank you very much I hope this works, it would be very important for me! Tonight I'll try to run this file, and I'll let you know what I obtain. Thank you again Fabrizio |
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October 28, 2008, 08:59 |
Hi Mattijs
I don't know ho
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#7 |
Member
fabrizio
Join Date: Mar 2009
Posts: 33
Rep Power: 17 |
Hi Mattijs
I don't know how to use this file, I'm not a master in C programming... I try with the command gcc writeCellsFile.C but I obtain a lot of errors concerning missing libraries, that should be installed if OpenFoam works correctly. Thanks for help Fabrizio |
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October 28, 2008, 09:14 |
Try the 'wmake' and 'wclean' c
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#8 |
Senior Member
Mark Olesen
Join Date: Mar 2009
Location: https://olesenm.github.io/
Posts: 1,677
Rep Power: 40 |
Try the 'wmake' and 'wclean' commands. These are OpenFOAM-specific.
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October 29, 2008, 04:38 |
Perfect it works!
Thank you
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#9 |
Member
fabrizio
Join Date: Mar 2009
Posts: 33
Rep Power: 17 |
Perfect it works!
Thank you very much! Nox I'm able to create the cell file, but I have another problem: when I type cgx -foam <root> <case> I obtain this error: element type tet4 not supported Now I'll try to change the element type of my mesh, do you know what is the right tipe? Thank you again Fabrizio |
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October 29, 2008, 05:13 |
You'll have to check on the ca
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#10 |
Senior Member
Mark Olesen
Join Date: Mar 2009
Location: https://olesenm.github.io/
Posts: 1,677
Rep Power: 40 |
You'll have to check on the calculix mailing list/forum.
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October 30, 2008, 06:03 |
Hi I think the problem should
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#11 |
Member
fabrizio
Join Date: Mar 2009
Posts: 33
Rep Power: 17 |
Hi I think the problem should be solved also in OpenFoam. When I type
cgx -foam <root> <case> I obtain this error: elem-type:tet4 not installed. I think this is due to the fact that OpenFoam names tethraedral element as "tet4", while Calculix names it as "C3D4", recognized as "type3" elements. Is it possible to assign a different name to an element type in OpenFoam? If possible, what should I modify? Thanks to all again Fabrizio |
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October 30, 2008, 07:09 |
If calculix wants to call it s
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#12 |
Senior Member
Mark Olesen
Join Date: Mar 2009
Location: https://olesenm.github.io/
Posts: 1,677
Rep Power: 40 |
If calculix wants to call it something else, that is their business. I wouldn't start changing OpenFOAM - there is lots that might break.
If you are writing ASCII format, then simply sed s/tet4/C3d4/g on the file. |
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October 30, 2008, 07:47 |
Thank you for your reply.
W
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#13 |
Member
fabrizio
Join Date: Mar 2009
Posts: 33
Rep Power: 17 |
Thank you for your reply.
What file (files) should I modify? |
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October 30, 2008, 08:15 |
Your 'cells' file of course!
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#14 |
Senior Member
Mark Olesen
Join Date: Mar 2009
Location: https://olesenm.github.io/
Posts: 1,677
Rep Power: 40 |
Your 'cells' file of course!
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October 30, 2008, 09:39 |
There is no information about
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#15 |
Member
fabrizio
Join Date: Mar 2009
Posts: 33
Rep Power: 17 |
There is no information about element type in cells file...
It only is a list of cells in this way: 4(a b c d) 4 stands for the number of nodes necessary to build the element, and a b c d are the points labels. That's why I thought I should modify some in OpenFoam...but I don't know what! Thanks Fabrizio |
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October 30, 2008, 10:07 |
Before you can change the outp
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#16 |
Senior Member
Mark Olesen
Join Date: Mar 2009
Location: https://olesenm.github.io/
Posts: 1,677
Rep Power: 40 |
Before you can change the output, you really need to know what calculix is expecting to read. Is there not a calculix mailing list or forum where you can find some help?
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