[petsc-users] Use of DM to update ghost values

Matthew Knepley knepley at gmail.com
Fri Apr 4 19:03:15 CDT 2014

On Fri, Apr 4, 2014 at 6:41 PM, TAY wee-beng <zonexo at gmail.com> wrote:

> Hi,
> Supposed, I use DM to construct my grid. I would like to know if DM can be
> used to update the ghost values easily?


> If I can use staggered grid, does it mean I have to create 3 DM grids
> (x,y,z)?

You can also just interpret components in different ways. See SNES ex30.

> Also, how can I solve the momentum eqn involving u,v,w using KSP?

-pc_type gamg.

> What examples can I follow for the above requirements?

SNES ex43, ex62, KSP ex48.


> Thank you.
> --
> Yours sincerely,
> TAY wee-beng

What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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