[petsc-users] Question about DMDA BOUNDARY_CONDITION set

[Wenbo Zhao]

Hi all.

I have a mesh is like below

1  2  3
4  5  6
7  8  9

I use DACreate2d to create mesh partition.

In my case, I have an rotation boundary condition. The whole mesh is like
below

9 8 7   3 6 9
6 5 4   2 5 8
3 2 1   1 4 7

7 4 1   1 2 3
8 5 2   4 5 6
9 6 3   7 8 9

It means that cell 2 near the top boundary are connected with cell 4 near
the left boundary, cell 3 with cell 7.

How can I set boundary condition or set my matrix?

I am looking forward for your help!

BEST,

Wenbo
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