[amber25]

I am using OpenFOAM-10 with chtMultiRegionFoam on a heat transfer problem with only solids.


The geometry of the model is given below:

mdl.png


I use fixed boundary conditions where T = 373 [K] on the outside edges of the model. This gives the result provided in the figure in the image below:

res.png

However, when I try to extract the heat flux at the outside edges of the model in the "system/controlDict" file using:

    wallHeatFlux1
    {
        type wallHeatFlux;
        libs ("libfieldFunctionObjects.so");
        region Cool;
        executeControl writeTime;
        executeInterval 1;
        writeControl writeTime;
        writeInterval 1;
    }

In "4e+10/Cool/wallHeatFlux", I simply get

    Sides
    {
        type            calculated;
        value           uniform 0;
    }

This is only the output for the patch on the outside edges of the model that I have labeled "Sides".


Does anyone know why this is the case? The heat flux is calculated properly on all internal surfaces and reported in "4e+10/Cool/wallHeatFlux" but is not of interest.