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Old   September 24, 2008, 12:37
Default Polyhedron and OpenFOAM
  #1
Polyhed
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Hi,

Do you know if polyhedron are supported by OpenFOAM? well I would likt to export a StarCD mesh and use OpenFOAM...

Thank you!
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Old   September 24, 2008, 13:02
Default Re: Polyhedron and OpenFOAM
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Hrvoje Jasak
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Yes, fully supported.

Enjoy,

Hrv
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Old   September 24, 2008, 23:40
Default Re: Polyhedron and OpenFOAM
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Ahmed
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May I suggest you re-write the readme file that comes with OpenFOAM and make it more accessible to people, like me for instance, who are new to the linux OS and have real difficulties installing the programme. I downloaded the 1.5 files, unpacked them, run the check script, the result is ok, then I have to source a lot of steps. I do not know what sourcing does mean in an Linux OS, I have a 1000 pages tome on opensuse, I have to find what sourcing does mean and how to apply it correctly. If you could rewrite that part and give a step by step instructions on how, that would be a real gift. You see, you have developed the programme and know all the details, but I am just a user who wants to look at the bright side of CFD, and, in my opinion, I do not need to be a guru on Linux Thank you
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Old   September 25, 2008, 03:56
Default Re: Polyhedron and OpenFOAM
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Polyhed
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Great, that's good news!

Thanks for your answer
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Old   September 25, 2008, 07:44
Default Re: Polyhedron and OpenFOAM
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Balduin Bankerotti
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It works as long as you don't have to do postprocessing with ParaView for real world problems including Polys ;-)
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Old   September 25, 2008, 10:43
Default Re: Polyhedron and OpenFOAM
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Hrvoje Jasak
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Well, I'm a bit better than that. For post-processors that cannot cope with polyhedral cells, OpenFOAM will automatically split the cell on the fly and present it to the post-processor as a set of tets/hexes/pyramids.

Happy?

Hrv
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Old   September 25, 2008, 11:05
Default Re: Polyhedron and OpenFOAM
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Balduin Bankerotti
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Not happy. It's just a workaround. Splitting a 2 million cell poly mesh will degrade the ParaView performance.

The poly implementation in the latest ParaView version is buggy and even slower.

Ok you get what you pay for and if you want a nice postprocessing EnSight is still available

Funny observation in ParaView: Export from StarCD in EnSight Gold format. Pressure file has a name case.P and temperature has case.T . Paraview is unable to read the pressure file but reads the temperature file (1 character variable name).

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Old   September 25, 2008, 18:14
Default Re: Polyhedron and OpenFOAM
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paraview-issues
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yes, you are correct. Paraview is big hurdle/ if the mesh is slighly larger there is big problem doing post processing with paraview.
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Old   September 26, 2008, 03:17
Default Re: Polyhedron and OpenFOAM
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Hrvoje Jasak
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Do we have any alternatives? Paraview is good, visualisation is nice, does not cost a fortune etc. I am sure the VTK and Paraview developers will sort out the polyhedral treatment soon if there is sufficient interest.

Hrv
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Old   September 26, 2008, 04:59
Default Re: Polyhedron and OpenFOAM
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Jed
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I use VisIt (http://www.llnl.gov/visit) regularly. The binaries work for me, it's a major pain to build from source. It has a lot more features than Paraview and generally supports more data formats. The UI is slightly less intuitive in my opinion.
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Old   September 29, 2008, 12:32
Default Re: Polyhedron and OpenFOAM
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AndyR
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Ahmed, I understand your frustration

"source" is actually a unix command. The syntax is usually

source SomeInputFileHere

Try using the "man" command to get an idea of how source works. ie

man source

You may find that you will get errors that the file you specified is not found which will seem odd to you becuase it is right there in the directory where you issued the command. This is because "." (or as we say DOT) is not in your path. So then the source command becomes

source ./SomeInputFileHere

I am sure the SUSE manual is overwhelming. Try and find a simple unix book. Is there a "unix for dummies"? A lot of open source stuff is very linux (unix) centric so having some idea of what a shell is and how it might be configured will definately come in handy.

Good luck - Andy R

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Old   September 29, 2008, 16:04
Default Re: Polyhedron and OpenFOAM
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Jed
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`source' is not and cannot be implemented as a program, it must be implemented in the shell because it manipulates the shell's environment. Also `man source' will not give you anything useful on most systems (`man bash' followed by a search for `source filename' will). You will frequently see it spelled `. filename'.

The purpose of this is to manipulate your environment (like PATH) so that the correct programs can be run without giving the whole path. Something like this can't be avoided unless the program is installed to a standard location.
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