[petsc-users] Neumann BC with non-symmetric matrix

[Mark Adams]

>
>
>> GAMG is use for AMR problems like this a lot in BISICLES.
>>
>
> Thanks for the reference. However, a quick look at their paper suggests
> they are using a finite volume discretization which should be symmetric and
> avoid all the shenanigans I'm going through!
>

No, they are not symmetric.  FV is even worse than vertex centered
methods.  The BCs and the C-F interfaces add non-symmetry.
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