[petsc-users] Non-uniform Cartisian Grid

[Alan]

Dear folks,
I hope you're having a nice day.
I'm testing the Poisson solver in /src/ksp/ksp/examples/tutorials/ex45.
It uses the 'DMDACreate3d' to generate a Cartisian structured grid and
solve it with uniform grid size. However, I attempt to modify it to
obtain solution with a Cartsian structured grid and non-uniform grid (It
is not unstructured local refined mesh). Should I still use the
'DMDACreate3d' and implement different grid size in 'ComputeMatrix' and
'ComputeRHS'? In other words, does 'DMDACreate3d' itself include any
mesh size information?

thanks,
Alan