[Netgen] Polymesh cells file missing

fabrizio · October 26, 2008, 04:42

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

olesen · October 27, 2008, 03:41

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.

fabrizio · October 27, 2008, 10:40

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

olesen · October 27, 2008, 12:23

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.

mattijs · October 27, 2008, 16:22

Had this lying around

writeCellsFile.tgz

fabrizio · October 28, 2008, 04:38

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

fabrizio · October 28, 2008, 08:59

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

olesen · October 28, 2008, 09:14

Try the 'wmake' and 'wclean' commands. These are OpenFOAM-specific.

fabrizio · October 29, 2008, 04:38

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

olesen · October 29, 2008, 05:13

You'll have to check on the calculix mailing list/forum.

fabrizio · October 30, 2008, 06:03

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

olesen · October 30, 2008, 07:09

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.

fabrizio · October 30, 2008, 07:47

Thank you for your reply.

What file (files) should I modify?

olesen · October 30, 2008, 08:15

Your 'cells' file of course!

fabrizio · October 30, 2008, 09:39

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

olesen · October 30, 2008, 10:07

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?

October 26, 2008, 04:42	Polymesh cells file missing	#1
fabrizio Member fabrizio Join Date: Mar 2009 Posts: 33 Rep Power: 18	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

October 27, 2008, 03:41	The proper solution is to fix	#2
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: https://olesenm.github.io/ Posts: 1,715 Rep Power: 41	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.

October 27, 2008, 10:40	Hi Mark thank for your advice.	#3
fabrizio Member fabrizio Join Date: Mar 2009 Posts: 33 Rep Power: 18	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

October 27, 2008, 12:23	Sorry, I don't know it off-han	#4
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: https://olesenm.github.io/ Posts: 1,715 Rep Power: 41	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.

October 27, 2008, 16:22	Had this lying around http	#5
mattijs Senior Member Mattijs Janssens Join Date: Mar 2009 Posts: 1,419 Rep Power: 27	Had this lying around writeCellsFile.tgz

October 28, 2008, 04:38	Hi Mattijs thank you very	#6
fabrizio Member fabrizio Join Date: Mar 2009 Posts: 33 Rep Power: 18	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

October 28, 2008, 08:59	Hi Mattijs I don't know ho	#7
fabrizio Member fabrizio Join Date: Mar 2009 Posts: 33 Rep Power: 18	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

October 28, 2008, 09:14	Try the 'wmake' and 'wclean' c	#8
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: https://olesenm.github.io/ Posts: 1,715 Rep Power: 41	Try the 'wmake' and 'wclean' commands. These are OpenFOAM-specific.

October 29, 2008, 04:38	Perfect it works! Thank you	#9
fabrizio Member fabrizio Join Date: Mar 2009 Posts: 33 Rep Power: 18	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

October 29, 2008, 05:13	You'll have to check on the ca	#10
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: https://olesenm.github.io/ Posts: 1,715 Rep Power: 41	You'll have to check on the calculix mailing list/forum.

October 30, 2008, 06:03	Hi I think the problem should	#11
fabrizio Member fabrizio Join Date: Mar 2009 Posts: 33 Rep Power: 18	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

October 30, 2008, 07:09	If calculix wants to call it s	#12
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: https://olesenm.github.io/ Posts: 1,715 Rep Power: 41	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.

October 30, 2008, 07:47	Thank you for your reply. W	#13
fabrizio Member fabrizio Join Date: Mar 2009 Posts: 33 Rep Power: 18	Thank you for your reply. What file (files) should I modify?

October 30, 2008, 08:15	Your 'cells' file of course!	#14
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: https://olesenm.github.io/ Posts: 1,715 Rep Power: 41	Your 'cells' file of course!

October 30, 2008, 09:39	There is no information about	#15
fabrizio Member fabrizio Join Date: Mar 2009 Posts: 33 Rep Power: 18	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	#16
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: https://olesenm.github.io/ Posts: 1,715 Rep Power: 41	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?