[petsc-dev] DMDA_BOUNDARY_GHOSTED

[Matthew Knepley]

On Thu, Sep 26, 2013 at 9:25 AM, Mark F. Adams <mfadams at lbl.gov> wrote:

> I am interested in making a cell centered test problem with Dirichlet BCs.
>  I want to go high(ish) order and doing explicit stencils (preferred) looks
> rather messy and I am interest in using ghost cells.  I assume this would
> entail using DMDA_BOUNDARY_GHOSTED.  I do not see any examples or
> documentation on using this other than just creating it.  Any suggestions?
>  I would think that there would have to be callback function for the user
> to set ghost values but I am not seeing anything like this around.  Perhaps
> I am not understand the intent of DMDA_BOUNDARY_GHOSTED.


My understanding is that it adds a single layer of ghost cells around the
domain boundary. Then these show up in the gxm, etc. so that
you can put values there if you want.

  Matt


>
> Mark




-- 
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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