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Average values on Boundary Conditions

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Old   February 23, 2012, 11:21
Default Average values on Boundary Conditions
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Hi everyone,
I am quite new to OpenFoam world and I need some help. I would like to calculate average values of velocity and pressure on my boundary patches. Any idea how can I do it? Any help will be appreciated
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Old   February 23, 2012, 12:00
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Philip Cardiff
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Hi,

You could use the patchAverage and/or the patchIntegrate post processing OpenFOAM utilities.

For example, to calculate the average pressure on a patch called myInlet:
Code:
patchAverage p myInlet
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Old   February 23, 2012, 12:09
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Hello Philip,
Thank your for your answer. I just tied patchAverage p inlet for my case works fine.
But for the velocity values if type patchAverage U inlet, I get the error :

Only possible to average volScalarFields

Is there any way to over come that error?
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Old   February 23, 2012, 12:16
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Philip Cardiff
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helloworld11,

patchIntegrate and patchAverage only operate on volScalarFields, so if you decompose your velocity field into its components first using foamCalc, i.e.
Code:
foamCalc components U
Then you can run patchAverage on each component:
Code:
patchAverage Ux myInlet
You can also use foamCalc to do other things like calculate the magnitude of a volVectorField:
Code:
foamCalc mag U
If you type something like "foamCalc banana" it will give you all the options.

Philip
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Old   February 23, 2012, 12:24
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Philip,

I followed the instructions you gave and now I am able to get values. Thank you very much.
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Old   November 19, 2019, 00:12
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Hi all,

Again i am initiating this old thread to find the average field values of two or three patches ..

Any command to measure the field average values of totally three patches ??

like three patches namely - inlet1,inlet2,inlet3 .. I need average value for three patches ..

Thanks in advance,
Vishsel
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