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

[Thomas Witkowski]

Is there (good) literature that provides more information about solving 
systems of PDE with geometric/algebraic multigrid?

Am 03.02.2012 14:11, schrieb Jed Brown:
> On Fri, Feb 3, 2012 at 16:03, Thomas Witkowski 
> <thomas.witkowski at tu-dresden.de 
> <mailto:thomas.witkowski at tu-dresden.de>> wrote:
>
>     The system writes
>
>     L 0 M
>     M L 0
>     L M L
>
>     With L = discrete laplace, M = mass matrix, 0 = empty matrix
>
>
> Hmm, what are the relative scales of these equations?
>
>
>
>         AMG is more delicate and generally less robust for systems.
>
>     Is this different with geometric multigrid?
>
>
> Null space issues are usually easier with geometric, but constructing 
> low energy interpolants can require custom work.

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