[Trilinos-Users] ML: -\Delta u + i omega u = f

Leonardo Traversoni ltd at xanum.uam.mx
Fri Mar 22 17:25:35 MDT 2013


PLEASE don't send me this trilinos mails anymore I don't even have a trilinos

On Fri, 22 Mar 2013 23:01:07 +0100, Nico Schlömer wrote
> Hi all,
> 
> I'm solving this complex-valued linear PDE problem
> 
> -\Delta u  + i omega u = f
> 
> with omega>0, and, let's say, homogeneous Dirichlet boundary. After
> discretization with linear finite elements, this problem should be
> very treatable with AMG according to
> <https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=877730>.
> Unfortunately, they don't specify the AMG parameters too clearly and 
> I cannot reproduce their results in one aspect: While small for 
> omega=1, the number of GMRES iterations increases with omega, and 
> quite quickly so. I'm thinking that I might not be on the correct 
> set of parameters.
> 
> Does anyone have any experience with this?
> 
> --Nico
> 
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