2 Dec
2016
2 Dec
'16
3:55 p.m.
On 2 Dec 2016, at 15:48, Anna Kalogirou <a.kalogirou@leeds.ac.uk> wrote:
Hi David,
Indeed, the issue is due to the 3rd block. The mathematical operator on the 3rd block is basically a mass operator so I don't understand why it is indefinite?
What was printed by fieldsplit_3_ksp_converged_reason? Plausibly it is just that the default PETSc LU does not pivoting (they changed this default a while ago). Does it help to say "fieldsplit_3_pc_factor_shift_type": "nonzero"? Lawrence