[petsc-users] question about the BuildGradientReconstruction

[Matthew Knepley]

On Sat, Oct 1, 2016 at 9:23 AM, Rongliang Chen <rongliang.chan at gmail.com>
wrote:

> Dear all,
>
> I have a question about the gradient reconstruction for the dmplexfvm.
>
> Why the ghost cells are ignored during the gradient reconstruction in the
> function BuildGradientReconstruction_Internal?
>

The may be a shortcoming. I have to think about that.


> For the tetrahedron mesh, if a cell (on the corner) whose three faces are
> on the boundary of the computational domain, then only one cell can be used
> to reconstruct the gradient (it is deficient for the least square). I found
> that, for this situation, the accuracy of the gradient reconstructed by the
> least square is a problem. Do you have any suggestions for deal with this
> situation?
>

That is definitely a problem. I will take a look.

  Thanks,

     Matt


> Best regards,
> Rongliang
>



-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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