[KTG]

Dear Faomers,


I am trying to simulate solar heating and the resulting convection. I would like to treat the heated solid boundaries as 1D rather than modeling the internal temperature profiles with multi region. I belive this is possible in theory, but I can't seem to find an example of an openFoam casefile that does this.



From my interenet searches, it seems that this boundary condition might be the right one for what I described above:

    {
        type            externalWallHeatFluxTemperature;

        mode            coefficient;

        Ta              constant 300.0;
        h               constant 10.0;
        thicknessLayers (0.1 0.2 0.3 0.4);
        kappaLayers     (1 2 3 4);
        
        kappaMethod     fluidThermo;
        
        qr                qr;        

        value           $internalField;
    }

But it crashes after the temperature goes below absolute zero. Can anyone point me in the right direction?


Thanks

[KTG]

I am really struggling with this and am very surprised I can't find an example casefile where there is solar radiation, and a surface actually changes temperature without using a chtMulitRegion solver. For example, if I wanted to make the surface temperature change in the simpleCarSolarPanel tutorial, can anyone tell me what boundary condition to use? Or alternatively, does anyone know of a textbook or journal papers that give a good introduction to this type of modeling in openFoam?

[Hawxliquid]

Originally Posted by KTG

I am really struggling with this and am very surprised I can't find an example casefile where there is solar radiation, and a surface actually changes temperature without using a chtMulitRegion solver. For example, if I wanted to make the surface temperature change in the simpleCarSolarPanel tutorial, can anyone tell me what boundary condition to use? Or alternatively, does anyone know of a textbook or journal papers that give a good introduction to this type of modeling in openFoam?

Hi,


Did you ever find a solution? Struggling with the same case

[KTG]

I am sorry to say I did not, this is currently in my simulation graveyard. I believe I am missing something about the theory, but do not have a good resource for that and have not found any leads in the openFoam documentation. If anyone out there has a suggestion, please post.