[Chris T]

Dear OpenFoam users,

I work with a chtMultiregion case. In one of the fluid regions I have implemented the fiewFactor radiation model. Now I want, for the same region, to specify a non-uniform external radiation heat flux (basically to simulate concentrated sunlight). How does one go about implementing this?
I looked in the documentation and I didn't find a clear answer.
I did notice the viewFactor.H file refers to a quantity "Ho" the same quantity in viewFactor.C is refer to as "external heatFlux". But I have no idea how to specify this quantity it seem it's something for the solver and not user specified.
The other thing I found which seem more promising is the qro field shown here in the documentation qro under the "greyDiffusiveViewFactorFixedValueFvPatchScalarFie ld Class Reference" in documentation. Does anyone know how to use it? I would imagine it is just another field but it's definition is weird

<patchName>    

 {
         type            greyDiffusiveRadiationViewFactor;
          qro             uniform 0;
         emissivityMode  solidRadiation;
          value           uniform 0;
     }

as you can see both qro and value are specified as uniform 0;. Which is the actual value of qro? Also how is qro coupled/relate to qr ?
I can imagine I should change the bountaries for qr from

{
        type            greyDiffusiveRadiationViewFactor;
        value           uniform 0;
        emissivityMode  solidRadiation;//lookup;
        qro             uniform 0;
        emissivity      uniform 0.7;
    }

to

{
        type            greyDiffusiveRadiationViewFactor;
        value           uniform 0;
        emissivityMode  solidRadiation;//lookup;
        qro             qro;
        emissivity      uniform 0.7;
     }

to point to the new file fro the qro field.



Any help will be appreciated.


Best,
Chris