[petsc-users] Neumann BC for interface elliptic problem

[Barry Smith]

On Sep 14, 2011, at 5:20 AM, Marco Cisternino wrote:

> "Everything" means everything: the solver converges with rtol=10^(-12) to the right solution.
> For tests with problems the solver converges but to a deformed solution.

   If the KSP solver converges (but to a deformed solution) this means the linear system must not be defined to be the same as before, for example the matrix is wrong.

    Barry

> I'm trying some other test, I would like to tell you exactly which is the difference between working and not working cases.
> thanks.
> 
> Marco
> 
> -- 
> Marco Cisternino
> PhD Student
> Politecnico di Torino
> Email:marco.cisternino at polito.it
>