[petsc-users] Use boomeramg to solve system of PDEs

[Thomas Witkowski]

Am 03.02.2012 13:43, schrieb Jed Brown:
> How did you order dofs?
Node-wise, thus the first three unknows are the three dofs of the first 
mesh node, and so on.
>
> How are the blocks coupled?
The system writes

L 0 M
M L 0
L M L

With L = discrete laplace, M = mass matrix, 0 = empty matrix
>
> AMG is more delicate and generally less robust for systems.
Is this different with geometric multigrid?

Thomas