[dune-pdelab] some problems in dune

[Robert Jendrny]

Moin moin,

thank you for these options ....

I have one last question:
If I calculate Poisson with Q1-elements, I get mesh-independent 
convergence with AMG, i.e. I needed the same iterations for meshsize h, 
1/2*h, 1/4*h,....
But I have problems with Q2-elements: The iteration number "explodes"

How can I fix it? Is it a consequence from mesh-transfer?

It would be nice if you can help me,

Robert


On 10/15/2014 09:22 PM, Rebecca de Cuveland wrote:
> Hey Robert,
> there should be another possibility, Markus implemented this some time 
> ago.
> You can use the parameters class to change the variable, I used it in 
> my code like this:
>
>     typedef Dune::PDELab::ISTLBackend_BCGS_AMG_ILU0<IGO> LS;
>     LS ls(tpgfs,250,1);
>     Dune::Amg::Parameters params;
>     params.setAccumulate(Dune::Amg::noAccu);
>     ls.setparams(params);
>
> Bye,
> Rebecca
>


-- 
Robert Jendrny
B.Sc. Technomathematik

TU Dortmund, Fakultät für Mathematik
LS III: Angewandte Mathematik und Numerik
M 1020, Vogelpothsweg 87, 44227 Dortmund
robert.jendrny at math.tu-dortmund.de