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chtMultiRegionSimpleFoam nonlinear heat conduction wrong temperature prediction

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Old   September 14, 2017, 03:10
Default chtMultiRegionSimpleFoam nonlinear heat conduction wrong temperature prediction
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Hello everybody,

as a preliminary work I am performing a validation of chtMultiRegionSimpleFoam for a simple nonlinear heat conduction problem. M. Danish et. al. developed an analytical solution for the 1D steady state heat conduction in a rod with linear varying heat conductivity.

I face a problem that I need much more cells with the chtMRSF solver to predict the temperature profile and the wallHeatFlux as can be seen in this figure.

With ANSYS Fluent I am able to predict the wallHeatFlux quite good with even three cells. To get comparable results with chtMRSF I need 160 cells.

Are there any improvements possible in my settings?

I am using OF 5.0 and the case is based on the multiRegionHeaterRadiation tutorial. BottomAir is only a dummy, with no influence on the solid heater region. I have implemented the linear varying heat conductivity like this

    transport       polynomial;
    thermo          hPolynomial;

        kappaCoeffs<8>     (-58.8 0.2 0 0 0 0 0 0);

        Hf      0;
        Sf      0;
        CpCoeffs<8>     ( 1 0 0 0 0 0 0 0 );



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