<div class="gmail_quote">On Mon, Jan 16, 2012 at 02:16, Klaij, Christiaan <span dir="ltr"><<a href="mailto:C.Klaij@marin.nl">C.Klaij@marin.nl</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div id=":1t9">Is it possible to use DMDAs in the context of a cell-centered<br>
finite volume method? For example, a 2D grid with 9-by-9 grid<br>
points would have 8-by-8 unknowns, located in the cell<br>
centers. After reading the documentation, I got the impression<br>
that the unknowns must be situated at the grid points, or am I<br>
mistaken?</div></blockquote></div><br><div>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.</div>