[petsc-users] Advices to decrease bicgstab iterations

[Edoardo alinovi]

Ps: I am solving Navier-Stokes equation (pressure-correction equation in
particular).  The matrix is sparse and in mpiaij fotmat.



Il 13 Dic 2017 8:39 AM, "Jed Brown" <jed at jedbrown.org> ha scritto:

> When asking solvers advice, please always explain the problem you are
> solving and the discretization that you use.
>
> Edoardo alinovi <edoardo.alinovi at gmail.com> writes:
>
> > Dear petsc users,
> >
> > I am doing some calculations to test my code in parallel using petsc.
> With
> > respect the serial code, which uses an in house bicstab+diagonal ILU
> > preconditioner, I note that petsc's bicgstab+ASM with standard options
> need
> > a larger number of iterations to converge (order 3 to 5). In base on your
> > expirience, do you have any method to improve the preconditioning?
> >
> > Thak you  ery much,
> >
> > Edoardo
>
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