Hi Samuel,
years ago there was an implentation of a so called "fluxline". This method
worked for the box-discretization and was exact (based on the variables of the
final newton step) and worked inside the domain. The flux computation on/over
boundaries is more complex if you use no weak impossition. So you may use a
fluxline in combination with a mass balance at the boundary scvs.
I've always used the fluxline to ensure that my modells and developments are
mass conservative and correct. Further it is important to know and compare
fluxes in real world applications.
Best regards,
Leo
> Samuel Scherrer <s.scher...@hotmail.de> hat am 19. März 2019 um 14:51
> geschrieben:
>
>
> Dear Dumux-users,
>
> I would like to track how much heat/water/air flows across certain
> interfaces in my model domain, e.g. across the water table or the
> boundaries. I'm using the Box discretization. Does someone of you know
> an easy way to do this, or is there a testcase that implements this?
>
> Best regards,
> Samuel
>
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