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convection + known heat flux BC in the same wall

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Old   November 19, 2013, 17:01
Question convection + known heat flux BC in the same wall
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zfaraday will become famous soon enough
Hi FOAMers!

I'm trying to solve a problem of heat conduction using laplacianFoam. The problem is that one of the BC is such that has convection and a heat flux of known value at the same time, according to the equation:

h*(Tinf-Tb) + q/A = -K*dT/dx
h, Tinf, q/A and K are known.

Another adjacent wall has only the convection part and I'm working with the next implementation with groovyBC:

      type              groovyBC;
      variables         "hwater=50.0;Twater=20.0;k=0.5;";
      valueExpression     "Twater";
      fractionExpression  "1.0/(1.0 + k/(mag(delta())*hwater))";
      value               uniform 50;
The first I thought about was only modifying the convection expression shown above to include the heat flux by adding the gradientExpression field, but I didn't see it clear... Besides I think that was not right.

I would appreciate some help with the implementation of the BC explained above with groovyBC (or maybe not..) since i can't solve my problem without it.

Thank you very much in advance!
Web site where I present my Master's Thesis:

The case I talk about in this site was solved with chtMultiRegionSimpleFoam solver and involves radiation. Some basic tutorials are also resolved step by step in the web. If you are interested in these matters, you are invited to come in!
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