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Old   April 20, 2011, 17:38
Default How to chtMultiRegionFoam
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Scot Johnson
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Anyone got a simple case or "how to" tip for getting started in chtMultiRegionFoam? My tutorials don't run. Pretty complicated. Thanks
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Old   April 21, 2011, 02:59
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the tutorial case should run. Maybe your openfoam isn't properly installed?
What is the error message you get?
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Old   April 21, 2011, 05:45
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yes - the tutorials should run.!

i 'll looking for my old simple case - maybe i find it.!
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Old   April 21, 2011, 09:30
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Thanks Val46 and Tobi. I'd like to start with something simple like a block of iron is heated at one end, how does the temperature at the other end rise with time. So I'd probably use chtMultiRegionFoam. But for any of the tutorials in chtMultiRegionFoam and chtMultiRegionSimpleFoam, I try running and get the error: Foam fatal error: Cannot find file "points" in directory "bottomAir/polyMesh" in times 0 down to constant". However, the tutorials don't look anything like the case of a block heated at one end. Anybody got a similar case? Many thanks, Danke Sehr. Scot
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Old   April 21, 2011, 09:47
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Hi Scot,

you started the tutorials with "./Allrun" ?
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Old   April 21, 2011, 09:51
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Quote:
Originally Posted by Scot View Post
Thanks Val46 and Tobi. I'd like to start with something simple like a block of iron is heated at one end, how does the temperature at the other end rise with time. So I'd probably use chtMultiRegionFoam. But for any of the tutorials in chtMultiRegionFoam and chtMultiRegionSimpleFoam, I try running and get the error: Foam fatal error: Cannot find file "points" in directory "bottomAir/polyMesh" in times 0 down to constant". However, the tutorials don't look anything like the case of a block heated at one end. Anybody got a similar case? Many thanks, Danke Sehr. Scot
Use Allrun and check the log files. My bet is on log.splitMeshRegions that will point the way. All of my missing "points" file errors were traced there.

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Old   April 21, 2011, 10:46
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Thank you Tobi and Mirko, ./Allclean and ./Allrun made it run, but the results appear very bad. In directory 0, all fields look fine. But in directories 50, 100, 150, 200, I get subdirectories "bottomAir", "topAir", etc and these all have the usual files p, phi, T, etc but these files are filled with a lot of junk symbols instead of scalar numbers. Instead of recognizable numbers for Temperature, for example, I get one number like 1200 followed by many lines of symbols. The log files look fine.
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Old   April 21, 2011, 12:23
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Originally Posted by Scot View Post
Thank you Tobi and Mirko, ./Allclean and ./Allrun made it run, but the results appear very bad. In directory 0, all fields look fine. But in directories 50, 100, 150, 200, I get subdirectories "bottomAir", "topAir", etc and these all have the usual files p, phi, T, etc but these files are filled with a lot of junk symbols instead of scalar numbers. Instead of recognizable numbers for Temperature, for example, I get one number like 1200 followed by many lines of symbols. The log files look fine.
How do the plots look?
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Old   April 21, 2011, 13:10
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Hi Mirko- No plots of any fields except for the initial state (directory 0), presumably because the field files in directories 50, 100 etc are filled with junk symbols. The only clue is the warning: 'Detected wildcard ".*" in changeDictionaryDict' in all 5 log.changeDictionary files. Curiously, in the field files in directory 0 such as T, the boundaryField is defined using this wildcard ".*", which appears to be used as a shorthand in place of the names of the various boundaries (frontAndBack, fixedWalls, etc). Are you using version 1.7 and have no problem viewing the Temperature, for example, of the chtMultiRegion tutorials? Thank you! Scot
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Old   April 21, 2011, 13:35
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Originally Posted by Scot View Post
Hi Mirko- No plots of any fields except for the initial state (directory 0), presumably because the field files in directories 50, 100 etc are filled with junk symbols. The only clue is the warning: 'Detected wildcard ".*" in changeDictionaryDict' in all 5 log.changeDictionary files. Curiously, in the field files in directory 0 such as T, the boundaryField is defined using this wildcard ".*", which appears to be used as a shorthand in place of the names of the various boundaries (frontAndBack, fixedWalls, etc). Are you using version 1.7 and have no problem viewing the Temperature, for example, of the chtMultiRegion tutorials? Thank you! Scot
On 1.7.1 I cannot run the chtMultiRegionFoam/multiRegionHeater tutorial. A keyword is undefined in one of fvSchemes files.

However I can run the chtMultiRegionSimpleFoam/multiRegionHeater

I also get the wildcard warning in the log files.

As for junk symbols, do you have compression set to yes in system/controlDict?
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Old   April 21, 2011, 15:53
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Mirko- I changed system/controlDict from "uncompressed" to "compressed". The result was that the field files were gzipped. But upon gunzipping, I see the same junk in the files rather than scalars. Please look in chtMultiRegionSimpleFoam/multiRegionHeater/100/topAir/T. Do you not see a bunch of symbols, many of which are a black ovals with a white question mark in it? Thank you again, Scot
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Old   April 21, 2011, 15:59
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Quote:
Originally Posted by Scot View Post
Mirko- I changed system/controlDict from "uncompressed" to "compressed". The result was that the field files were gzipped. But upon gunzipping, I see the same junk in the files rather than scalars. Please look in chtMultiRegionSimpleFoam/multiRegionHeater/100/topAir/T. Do you not see a bunch of symbols, many of which are a black ovals with a white question mark in it? Thank you again, Scot

Yes, I see junk too even though I am writing uncompressed.

But I can preview the results in Paraview.

Can you post (attach) a part of log.chtMultiRegionSimpleFoam for timesteps 0, 1, 2?

That might tell us how the numerics are going.

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Old   April 21, 2011, 16:13
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Mirko- you see junk in the field files as I do, but you are able to view the results using paraFoam? I can select fields only for time = 0. For later times, I only have the possibility of selecting "Solid Color", "vtkCompositeIndex" and "cellNormals". I can't get T or U or anything else to show up in ParaFoam's object inspector. Can you view temperature, for example, at the end of the simulation?
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Old   April 21, 2011, 16:18
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Quote:
Originally Posted by Scot View Post
Mirko- you see junk in the field files as I do, but you are able to view the results using paraFoam? I can select fields only for time = 0. For later times, I only have the possibility of selecting "Solid Color", "vtkCompositeIndex" and "cellNormals". I can't get T or U or anything else to show up in ParaFoam's object inspector. Can you view temperature, for example, at the end of the simulation?
Yes, I can see the results in paraFoam.

One thought: You need a file whatever.foam in the run directory for paraFoam to read the files.
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Old   April 21, 2011, 16:27
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In my "run" directory is only another directory "tutorials". Would you please say in more detail what your mean about needing a "whatever.foam in the run directory"? Thank you! Scot
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Old   April 21, 2011, 16:43
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In my "run" directory is only another directory "tutorials". Would you please say in more detail what your mean about needing a "whatever.foam in the run directory"? Thank you! Scot
No, somewhere you need to have a directory with 0, constant, system directories, and Allrun and Allclean. That is your run directory.
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Old   April 21, 2011, 16:59
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My directory is /chtMultiRegionSimpleFoam/multiRegionHeater. What file is needed here for paraFoam to read the files? PS: I've had no trouble with other heat transfer solvers such as buoyantSimpleRadiationFoam. But in all those cases, the field files were filled with ascii numbers, never symbols. Thank you for your continued consideration! Scot
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Old   April 21, 2011, 17:05
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Originally Posted by Scot View Post
My directory is /chtMultiRegionSimpleFoam/multiRegionHeater. What file is needed here for paraFoam to read the files? PS: I've had no trouble with other heat transfer solvers such as buoyantSimpleRadiationFoam. But in all those cases, the field files were filled with ascii numbers, never symbols. Thank you for your continued consideration! Scot
Sorry, but I'm out of ideas
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Old   April 21, 2011, 19:48
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Sometimes field files have format ascii, as seen at the the top of the file. The junky files I note have "format binary". So that's the answer to that, but I still can't view results in paraFoam. Will keep trying, Thank you for your help! Scot
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Old   April 22, 2011, 05:29
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hey - normally you can 'not open the files in 1 2 3 4 5 - like T or U - only in the "0" file you can open it correctly (it 's my experience).

Sometimes (if you using for example buoyantFoam) you got the files as a tar zip... so thats not a problem.

I am using OF-1.7.x
the tutorials are working fine...

i added the tutorial files...


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