Many thanks for your concrete replies. They are very helpful.
Best Wishes,
Xiaofeng
On Sep 27, 2022, at 20:01, Mark Adams mailto:mfad...@lbl.gov>>
wrote:
Shells can be pretty hard.
Start with an easy problem with well-shaped elements and probably best to start
with a well-supported structure
Composed preconditioners (like field split) have multiple moving parts and
you need to "tune" them for each part separately; you cannot just run the
entire preconditioner, get slow convergence on the entire problem and then give
up.
So step one is to get a good preconditioner for
Shells can be pretty hard.
Start with an easy problem with well-shaped elements and probably best to
start with a well-supported structure (eg, not a long cantilever).
You should also configure with hypre and try that. I don't know if they
deal with shells, but it is a well developed solver.
Hello,
A00 comes from shell structures and discretized by FEM.
Thanks,
Xiaofeng
On Sep 27, 2022, at 17:48, Mark Adams mailto:mfad...@lbl.gov>>
wrote:
what equations and discetizations are in A00?
On Tue, Sep 27, 2022 at 1:45 AM 晓峰 何
mailto:tlan...@hotmail.com>> wrote:
Hi Barry,
A00 is
what equations and discetizations are in A00?
On Tue, Sep 27, 2022 at 1:45 AM 晓峰 何 wrote:
> Hi Barry,
>
> A00 is formed from elliptic operator.
>
> I tried GAMG with A00, but it was extremely slow to solve the system with
> field-split preconditioner(I’m not sure I did it with the right way).
>
