>
>
>
> -fieldsplit_velocity_ksp_type preonly -fieldsplit_velocity_pc_type gamg
> -fieldsplit_pressure_ksp_type minres -fieldsplit_pressure_pc_type none
>
You should use cg for the ksp_type with gamg if you are symmetric and gmres
if not (you can try cg even if it is mildly asymmetric).
Hello Barry,
Thank you for your reply.
I reduced the tolerances and get desired solution.
I am solving a multiphase incompressible n-s problems and currently
we are using augmented lagrangina technique with uzawa iteration.
Because the problems are getting larger, we are also looking for some
> On Mar 16, 2019, at 6:50 PM, Y. Shidi via petsc-users
> wrote:
>
> Hello,
>
> I am trying to solve the incompressible n-s equations by
> PCFieldSplit.
>
> The large matrix and vectors are formed by MatCreateNest()
> and VecCreateNest().
> The system is solved directly by the following
Hello,
I am trying to solve the incompressible n-s equations by
PCFieldSplit.
The large matrix and vectors are formed by MatCreateNest()
and VecCreateNest().
The system is solved directly by the following command:
-ksp_type fgmres \
-pc_type fieldsplit \
-pc_fieldsplit_type schur \
