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July 4, 2018, 13:50 |
Extract average values of faceZone
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#1 |
New Member
Dan Vidal
Join Date: Dec 2017
Posts: 7
Rep Power: 8 |
Dear all,
I usually monitor area average quantities (p, U) from patches with function objects in “controlDict” like for example: Code:
functions { outletSFV { type surfaceFieldValue; libs ("libfieldFunctionObjects.so"); enabled yes; log yes; writeFields no; regionType patch; name outlet; operation areaAverage; // operation weightedAverage; // weightField phi; fields ( U p ); } } The Foam Error I get: [5] --> FOAM FATAL ERROR: [5] surfaceFieldValue rs1SFVs: faceZone(interior_rotorstator_1): Unable to process internal faces for volume field U How can I get te internal volume field U automatically interpolated on the faceZone or if there is other way to extract on fly average values from an faceZone? I am using OpenFoam v5. Thanks for any help! Aurelius Last edited by Aurelius; July 6, 2018 at 13:36. |
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July 4, 2018, 15:52 |
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#2 |
Senior Member
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Hi, don't know how to help, but if you set e.g.
Code:
regionType banana Eg: If code has faceSet implemented, maybe you can use topoSet to define one... Just a hint... Cheers Last edited by student666; July 4, 2018 at 23:11. |
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July 4, 2018, 23:11 |
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#3 |
Senior Member
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Just checked my personal notes...
https://www.cfd-online.com/Forums/bl...rocessing.html As you may see, I largely use "banana method" and strangely if I put: Code:
regionType banana Code:
--> FOAM FATAL IO ERROR: banana is not in enumeration: 3 ( faceZone patch sampledSurface ) |
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July 5, 2018, 05:18 |
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#4 |
New Member
Dan Vidal
Join Date: Dec 2017
Posts: 7
Rep Power: 8 |
Thanks for your answer.
If I put "surfaceInterpolate" instead of "surfaceFieldValue" in "type" field OF does not crash (remember I've got foam fatal error "Unable to process internal faces for volume field p"), but now OF reports: ... surfaceInterpolate rs1SFVs write: surface field p already exists surfaceInterpolate rs1SFVs write: Writing interpolated surface fields to 410 ... or in other words I cannot monitor "p" on fly as I do when "regionType" is a patch. Regards. |
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July 5, 2018, 13:45 |
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#5 |
Senior Member
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Well, it's hard to understand what you're doing, but I remember I performed a study case with a fan where the goal was to measure how much the rotational speed affected the rate of change of p at the suction side, using the "notes" I wrote on my personal blog, I managed to overcome the issue.
If I were you I would define an stl, as I did. Regards. |
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July 5, 2018, 15:25 |
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#6 |
New Member
Dan Vidal
Join Date: Dec 2017
Posts: 7
Rep Power: 8 |
I aim the same as in your case. It is a fan that is built up in a domain in which I cannot with patches catch control surfaces on the over/under-pressure sides to follow "p" during the calculation. The only surface definition in the model for that are faceZones, that's why I tried with my function object changing "patch" (with it works fine) with "faceZone". I have little experience with OF, I will look how to define a stl for these faceZones. Thanks again for your help!
Regards. |
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October 11, 2018, 07:46 |
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#7 |
New Member
Josef Dobeš
Join Date: Mar 2012
Location: Czech republic
Posts: 12
Rep Power: 14 |
Hi Aurelius,
do you solve your issue? I use OpenFOAM dev - totalPressureDifference works perfectly for patches, but if I wanted to online monitoring the faceZone it doesn't work. Thanks |
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October 11, 2018, 10:53 |
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#8 |
New Member
Dan Vidal
Join Date: Dec 2017
Posts: 7
Rep Power: 8 |
Hi Iose,
no, i didn't. My model comes from a fluent .msh file and i do not know how to define the faceZone as it would be in a stl in order i can address it via sample function in controlDict. Regards. Last edited by Aurelius; October 12, 2018 at 14:55. |
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October 15, 2018, 04:30 |
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#9 |
New Member
Josef Dobeš
Join Date: Mar 2012
Location: Czech republic
Posts: 12
Rep Power: 14 |
Hi Aurelius,
I found solution with help from wyldckat, see this HTML Code:
https://www.cfd-online.com/Forums/openfoam/75393-internal-faces-monitoring.html#post710030 |
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April 18, 2019, 10:18 |
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#10 | |
Member
Martin
Join Date: Aug 2018
Posts: 33
Rep Power: 8 |
Quote:
Code:
https://www.cfd-online.com/Forums/openfoam/75393-internal-faces-monitoring.html#post710029 |
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May 16, 2022, 10:32 |
This solves the issue
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#11 |
New Member
Akshay
Join Date: Jan 2020
Posts: 28
Rep Power: 6 |
p, U are volume fields, if you are using surfaceFieldValue, you need surface fields.
Hence you need to interpolate the volume fields to get surface fields. Go through this, this solution will definitely solve this issue. HTML Code:
https://www.cfd-online.com/Forums/openfoam-post-processing/238974-facezoneaverage-function-object-does-not-work-field-u-p-etc.html Akshay |
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facezone, function objects |
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