[petsc-dev] FieldSplit and PCLSC

[Jed Brown]

On Wed, May 4, 2011 at 15:29, <domenico.borzacchiello at univ-st-etienne.fr>wrote:

>                -fieldsplit_pressure_pc_type lsc \
>                -fieldsplit_pressure_lsc_ksp_type fgmres \
>                -fieldsplit_pressure_lsc_ksp_max_it 100 \
>                -fieldsplit_pressure_lsc_ksp_constant_null_space \
>                -fieldsplit_pressure_lsc_pc_type lu \
>                -fieldsplit_pressure_lsc_pc_factor_mat_solver_package mumps
>

Perhaps this direct solve is the problem? That operator is expected to be
singular due to the constant null space so a direct solve is expected to
produce nonsense.
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