[a19910112a]

Hi Foamers,
This question was posted years ago and seems no good enough answer to it. I have the picture of the problem:

This is a very simple question similar to the planewall2D question, except the bottom air is changed by a heat generation block. I managed to do this with a constant heat generation rate and the case file is attached.

The current problem is that I want to set the heat generation rate that changes according to the system coordinate. Something like q'''=cos (x), which I think should be easily done by editing some lines in the fvOption file.

Anyone could suggest a method to do this?

I have been considering the scalarCodedSource utility, but the C++ is a little bit confusing. Anyone has an example on this? I have the officially provided example, but some illustration for the code is needed.

[jhoepken]

Hi a19910112a from England ,

what exactly is your problem with the codedSource and C++? The particular hooks used are explained in the sources quite well (on an average OpenFOAM level, to be fair).

If you just want to change the temperature on the walll, why don't you go for groovyBC or code your own?

[hesong]

you can try this
myPatch
{
type codedFixedValue;
value uniform 0;
redirectType myFixedValue; // name of generated BC

code
#{
forAll(*this, i)
{
scalar z = patch().Cf()[i][2];
if (z > 0 && z < 32)
(*this)[i] = 0.0075 * z -1.58;
else if (...)
...;
else
...;
}
#};

codeInclude
#{
#include "fvCFD.H"
#};

codeOptions
#{
-I$(LIB_SRC)/finiteVolume/lnInclude
#};
}