[Utkan]

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.

[olesen]

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).

[Utkan]

Thank you olesen for your reply.
I will look into Patchfunction1 and see if I can manage to get it done.

[olesen]

Originally Posted by Utkan

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

[Utkan]

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?

[parthigcar]

Is this functionality is available to OpenFOAM v1812?

[olesen]

Originally Posted by parthigcar

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

[parthigcar]

        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

[olesen]

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.