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

[TAY wee-beng]

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)?

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

What examples can I follow for the above requirements?

Thank you.

-- 
Yours sincerely,

TAY wee-beng