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From: A B on 25 May 2010 11:31
"Bruno Luong" <b.luong(a)fogale.findmycountry> wrote in message <hd9h40$f7s$1(a)fred.mathworks.com>...
> FYI, I have solved structural problems with stiffness matrix of size about 70000. I can't recall having problem with PCG.
>
> Bruno

I'm still having trouble with the same problem, hower now with +200kdof.
Now I can't use a direct solver on a 32bit system anymore, even with metis or similiar as it will run ouf of memory.

I'm looking into suitable preconditioners for structural mechanics problems. Jacobi and incomplete factoriations aren't well-suited, especially for ill-conditioned problems.

ANSYS also includes a special preconditioner, which seems to be somehow element based, for such kind of problems. Has anyone got an idea, on what kind of preconditioner they might be using?

Any ideas on better preconditioners, eventually also toolboxes etc.?

Thanks
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