[petsc-users] [Libmesh-users] Convergence rate for petsc virs

[Dmitry Karpeev]

On Sat, Aug 11, 2012 at 6:36 PM, Subramanya Gautam Sadasiva <
ssadasiv at purdue.edu> wrote:

> Hi,
> I was trying the snes solver on the obstacle problem by modifying
> miscellaneous ex 7 and I get only linear convergence times.Is this what is
> expected from the virs solver?
>
Yes, in the sense that you can't expect Newton's typical quadratic
convergence: you are not using Newton's method in the usual sense,
since the linear (and, in a sense, the nonlinear) problem you are solving
changes every time the coincidence set changes.

Dmitry.

> THanks,
> Subramanya
>
>
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