[petsc-users] Non-uniform Cartisian Grid

Alan zhenglun.wei at gmail.com
Wed Nov 7 19:10:30 CST 2012

Thank you so much, Dr. Smith.

> On Nov 7, 2012, at 6:50 PM, Alan <zhenglun.wei at gmail.com> wrote:
>> 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?
>    You can use DMDASetCoordinates() and DMDAGetCoordinates() (called DMSetCoordinates() and DMGetCoordinates() in petsc-dev) to keep track of the coordinates but you are responsible for generating the correctly scaled entries in the matrix etc.
>    Barry
>> thanks,
>> Alan

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