[petsc-users] floating region help

[Jed Brown]

On Tue, Sep 20, 2011 at 11:17, Gong Ding <gdiso at ustc.edu> wrote:

> Thanks. Any recommends for solving this type of problems?
> It's our bottleneck now.
> Direct solver works, but not efficient for large 3D problem.
> Krylov space based solver seems not rubost enough.
> A more exact ILU preconditioner may help?
>

You can use domain decomposition with the jump aligned to subdomain
boundaries. There are a variety of schemes with convergence rate independent
of the jump, from both the overlapping Schwarz and Neumann-Neumann families.

Can you describe the 3D problem in more detail?
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