[petsc-users] working with different size of arrays in a single DA

[Jed Brown]

On Thu, Apr 28, 2011 at 15:41, ilyas ilyas <ilyascfd at gmail.com> wrote:

> Would you please explain more the first option?


You create a system with larger block size. If you have two node-centered
values and one cell-centered, you would use a block size of 3. Each center
would be associated with the node to its lower left, for example. There will
be a fringe of "cell-centers" that extend out of domain on the right and
top, you use x = 0 for these equations and the Jacobian for those equations
will just have a 1 on the diagonal.
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