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[swak4Foam] Fixed Wall Heat Flux with groovyBC

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Old   September 7, 2016, 09:48
Default Fixed Wall Heat Flux with groovyBC
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Hello FOAMers,

I'm currently trying to run a multiRegion case. I need a temperature dependent heat flux boundary condition with radiation and convection term on the outside of the solid (not coupled with the fluid). So I tried to use groovyBC. But there you can only specify the temperature gradient.

q = gradT * thermal diffusity

Code:
geh_out
    {
        type                         groovyBC;
        gradientExpression           "gradT";
        fractionExpression           "0";
        variables                    "Tinf=313.15;k=160;heatFlux=-(radiation+convection);gradT=heatFlux/k;";
    }
But I don't know which thermal diffusity to use. I tried the thermal diffusity from the solid, but the result was incorrect. Which thermal diffusity can I use?
In comparison to CFX, is there the possibility to determine a heat flux?

With best regards
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