[petsc-users] DMDA with cell-centered finite volume method?

[Jed Brown]

On Mon, Jan 16, 2012 at 02:16, Klaij, Christiaan <C.Klaij at marin.nl> wrote:

> Is it possible to use DMDAs in the context of a cell-centered
> finite volume method?  For example, a 2D grid with 9-by-9 grid
> points would have 8-by-8 unknowns, located in the cell
> centers. After reading the documentation, I got the impression
> that the unknowns must be situated at the grid points, or am I
> mistaken?
>

Just make an 8x8 grid. Geometric refinement and coarsening is a little more
delicate. I have used the hack of saying that the grid is periodic so that
refinement is to 2n instead of 2n-1. You might want to use Q0 interpolation
in this case.
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