[petsc-users] BoomerAMG Howto

[Gong Ding]

I had tried BoomerAMG for poisson equation, which works well.
But when I preform it on my semiconductor system, it does not convergence.
I guess the reason is semiconductor equations has three variables, the potential, electron and hole density,
the algebraic multigrid arithmetic does not consider this and treat coarsen/smooth between different variables.

Is there any way to specify coarsen arithmetic by user? 
Since each mesh node has 3 variables, I would like to do point based coarsen operation.

      


  BoomerAMG can not handle the linear system you are giving it. Each algebraic multigrid solver can only handle a certain class of problems.


    Barry

On Sep 3, 2010, at 9:55 AM, Gong Ding wrote:

> Dear all,
> I am trying to use Boomer AMG of hypre + GMRES for my nonlinear problem, which is solved by MUMPS or GMRES +ILU previously.
> However AMG does not convergence.
> 
> The -ksp_monitor shows that there are huge residual during inner GMRES iteration, as large as 1e30.
> I only change PC from ILU to boomeramg.
> Can anyone tell me what's wrong with it?
> 
> Gong Ding