[shuailiao]

Hi everyone:
I have modelled a empty filling box with two plane which are defined as heat sources, now I want to define a fixed flux for these two planes, for which one is 10W and the other one 20W (values do not matter), but I find the boundary condition I can set is temperature, so any one knows how to define flux for this?

[ingraban]

You can define a temperature gradient for your heat source, see
fixedgradient-boundary-condition

    heatWall
    {
        type            fixedGradient;
        gradient        uniform 416.67;
    }

Don't ask me how this works, I haven't tried it, yet. I would like to know the relation of this gradient to the heat flux.

[clapointe]

Yes, you can set the gradient to have a fixed heat flux. If you resolve the wall, then conduction is the only mode for heat transfer (sans radiation). Then q is a function of fluid kappa and the gradient. There appears to be a boundary condition to help (where this relation is done for you), see : https://github.com/OpenFOAM/OpenFOAM...hScalarField.H.

Caelan

[Owais Shabbir]

Hi all,



I am also trying to introduce a heat source for my own case as well. I am originally working with chtMultiRegionFoam but I am having a lot of problems (e.g. after a few iteration, min/max rho: -2.6961604 1.3035596) with that.



I am thinking of trying to drop multiregion for now and see how just convection works so i am curious if this B.C. externalWallHeatFluxTemperature could be applied to buoyantBoussinesqSimpleFoam solver. I want to introduce power [W] as that´s what I am provided with.



Thanks

Owais