question on DMMG

[Randall Mackie]

I'm interested in trying to use multi-grid techniques to solve my problem,
but it's unclear to me how to define the right-hand side and system matrix
for my case where the grids are not uniform (ie, the grid lengths x,y,z are
variable, and the grid properties are variable).

Right now I'm solving my equations using a DA. So, on the finest scale I know
how to compute the RHS and the Jacobian. It's unclear to me how PETSc
does the multi-gridding, and therefore how I would write my code.

Any pointers would be appreciated.

Thanks, Randy

-- 
Randall Mackie
GSY-USA, Inc.
PMB# 643
2261 Market St.,
San Francisco, CA 94114-1600
Tel (415) 469-8649
Fax (415) 469-5044

California Registered Geophysicist
License No. GP 1034