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Use transient gradient as BC- timeVaryingUniformFixedGradient?

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Old   June 7, 2011, 03:08
Default Use transient gradient as BC- timeVaryingUniformFixedGradient?
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Hello!

I have yet another question and hope that you can help me.

To simulate a heat flux into a wall (heat transfer in solid, laplacianFoam) I
need to apply a transient gradient to a patch (simulating sun shine).

The values I need to apply are listed in a text file and I would like to
apply them the same way timeVaryingUniformFixedValue is working.

Code:
SecondFace
    {
    type         timeVaryingUniformFixedValue;
    fileName     "SecondFace.dat";
    }
Some sort of timeVaryingUniformFixedGradient would be working fine.
Is there something like that or do you have other ideas how this
could be done?

Kind regards,
Walter
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Old   June 7, 2011, 03:23
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One thought that came to my mind right now:

In the time step folders there are files listing the boundary conditions and start values for each step. Is it possible to create a part of these files beforehand?

E.g. OpenFOAM finds an already existing temperature file T in the time step directory just listing a new boundaryField-section for that step. The values
for T are written in there automatically during the calculation of the first step.
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Old   June 7, 2011, 11:20
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Quote:
Originally Posted by homerun4711 View Post
One thought that came to my mind right now:

In the time step folders there are files listing the boundary conditions and start values for each step. Is it possible to create a part of these files beforehand?

E.g. OpenFOAM finds an already existing temperature file T in the time step directory just listing a new boundaryField-section for that step. The values
for T are written in there automatically during the calculation of the first step.
<the sound of Bernhard unashamedly beating the drum of his latest project>

No. Prefeeding the directories with BCs is not possible. But both the things you're trying to do (calculated gradient AKA heatFlux and/or timelines) can be done with groovyBC/swak4Foam
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Old   June 7, 2011, 14:24
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Thanks for your answer!

groovyBC looks good.
akidess has already beaten the drums in another thread Beginner needs help with BCs and solver

Kind regards,
Walter
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