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Time varying externalWallHeatFlux

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Old   February 18, 2022, 16:01
Question Time varying externalWallHeatFlux
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Utkan Erdem
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Hello everyone,
I am trying to feed a tabular .txt format into my T file under the 0 folder. The .txt file has external heat fluxes for each patch in each column. And with each row, the heat fluxes are incremented by one time step.

How can I feed such a file into the T file in my case?
Is there a way to use externalWallHeatFlux BC with varying heat fluxes?

I can supplement additional info about my case and the setup if asked. Thank you.
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Old   February 20, 2022, 07:11
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Mark Olesen
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According to the docs https://www.openfoam.com/documentati...d.html#details
the heat flux can be specified as a PatchFunction1 - ie, space and time varying. If you have tabulated values, the first column will normally represent time (not time step).
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Old   February 20, 2022, 08:08
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Thank you olesen for your reply.
I will look into Patchfunction1 and see if I can manage to get it done.
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Old   February 20, 2022, 08:55
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Quote:
Originally Posted by Utkan View Post
Thank you olesen for your reply.
I will look into Patchfunction1 and see if I can manage to get it done.
PatchFunction1 is mostly like a regular Function1
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Old   February 24, 2022, 13:32
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Utkan Erdem
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Hello Olesen,
I am new to coding in OpenFOAM, how can I practice before getting busy with Function1?
Can you guide me how to specify my tabular heat flux file as a patchFunction1 type?
Where should I start?
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Old   June 11, 2022, 03:18
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Is this functionality is available to OpenFOAM v1812?
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Old   June 21, 2022, 06:15
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Mark Olesen
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Originally Posted by parthigcar View Post
Is this functionality is available to OpenFOAM v1812?

Unlikely to be in that version, but see the corresponding commit if you want to do a mini backport yourself:
https://develop.openfoam.com/Develop...a8792d838ac365
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Old   June 21, 2022, 07:02
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Code:
        Patch
       {
        type              codedFixedValue;
        value             uniform 300;
        name             some_name;
        codeInclude     
        #{
            #include "fvCFD.H"
            #include <cmath>
            #include <iostream>
        #};
        code
        #{
        scalarField& field = *this;
        field = this->patchInternalField() + (q(t)/(kappa * this-> patch().deltaCoeffs()));
        #};
        codeOptions
        #{
            -I$(LIB_SRC)/finiteVolume/lnInclude \
            -I$(LIB_SRC)/meshTools/lnInclude
        #};
}

Thank you, Mark Olesen. I will try your backport. In between, I have implemented codedFixedValue boundary condition for time-varying heat flux. Is the above implementation correct? @Mark_Olesen
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Old   June 21, 2022, 08:54
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Mark Olesen
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I would simply not waste the time with a coded BC. You never know what other problems you will have, or things you have forgotten. Fastest is either your own backport (can probably even just use a plain diff to piece together what you need) or bump up to a new OpenFOAM version.
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