Have you considered PCFieldSplit? The SCHUR variant gives you all sorts of
approximate factorization schemes, though you might find that an additive or
multiplicative split is almost as good for this problem.
"Karabelas, Elias (elias.karabe...@uni-graz.at)"
writes:
> Hey all,
>
> so
Hey all,
so I have a nonlinear problem that can be abstractly written as
| F(u,P) | | 0 |
||= | |
| G(u,P) | | 0 |
Here u is a variable that comes from a discretization of a PDE and P are four
scalars that come from some coupled attached ODEs (P =
