It seems to me that the specification of the flux out is not correct. In 
principle, instead of the Qout, one should specifiy a fixed head or 
temperature and the flux should adjust itself acoordingly. 

On Tuesday, October 25, 2016 at 9:14:08 PM UTC+2, Daniel Arndt wrote:
>
> OK. So do I understand you correctly, that you are imposing Neumann 
> boundary conditions on all *four* boundaries?
> In that case the solution is only unique up to a constant.
>
> It seems to my that in the problem I posed, the boundary condition is not 
>> correct.
>>
> Can you be a bit more specific? How does the weak formulation you consider 
> look like?
> What kind of problems do you observe?
>
> Best,
> Daniel
>

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