[petsc-users] Propagating a constant marker with AMG

[John Mousel]

If I recall correctly, GAMG has a somewhat high setup cost and this is a
solver I'll only be using for one single solve. It's not a physical field,
it's just a marker; 1 inside, 0 outside a surface described by a CAD file.
This marker is being propagated into the volume of an octree volumetric
grid. I'm just taking advantage of the fact that the solution of the
Laplace equation with constant BC's is the constant.

On Tue, Mar 31, 2015 at 3:22 PM, Jed Brown <jed at jedbrown.org> wrote:

> John Mousel <john.mousel at gmail.com> writes:
>
> > I'm trying to mark two distinct regions of a domain by solving the
> Laplace
> > equation with constant Dirichlet BC's. Because I'm just rounding to the
> > nearest integer, I just need cheap AMG like behavior to move the constant
> > across the domain quickly.
>
> What is the physical propagation mechanism?  Is there a concept of
> conservation that should be satisfied?  What's wrong with a normal AMG
> configuration for the Laplacian?
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20150331/c2e6a746/attachment.html>