On Wed, 28 Apr 2010 12:06:47 +0200, Lorenzo Botti <[email protected]>
wrote:
> If my variables are u v w p (3D stokes equation) and I have an equal order
> approximation
> Can I just do
>
> -pc_fieldsplit_0_fields 0,1,2
> -pc_fieldsplit_1_fields 3
> -pc_fieldsplit_type schur
> -pc_filedsplit_block_size <n_dofs_per_variable>
Yes, and you can control the solver for the velocity block under
-fieldsplit_0_{ksp,pc} and for the Schur complement under
-fieldsplit_1_{ksp,pc}. Note that with some discretizations, like
stabilized Q1-Q1, you may get better results using an unsplit method
(multigrid on the coupled system). This doesn't work with mixed methods
unless you define custom restrictions and smoothing operators.
Jed
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