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-   -   GAMG Solver (http://www.cfd-online.com/Forums/openfoam-solving/59434-gamg-solver.html)

tutlhino July 22, 2007 04:23

Hello all, does anyone of you
 
Hello all,
does anyone of you know more about the GAMG Solver which is used in openFOAM 1.4, or know a paper where this multigrid method is proposed? Unfortunately I didn't find anything about it.

In of1.3 just an AMG was offered for symmetric matrices, does the GAMG mean now that it is a mixture and the geometric mg is used for asymmetric matrices, where AMG is still used for symmetric matrices?

Cheers
Florian

tutlhino July 25, 2007 05:35

Does anyone know if I'm right
 
Does anyone know if I'm right with my assumption, or is different?

Cheers
Florian

eugene July 25, 2007 12:18

GAMG can be used for both symm
 
GAMG can be used for both symmetric and asymetric matrices, and is basically an upgrade for the old AMG. However, it is not very cost effective to use GAMG for asymmetric matrices at present.

pvc September 20, 2007 04:53

Hi Eugene, So what would y
 
Hi Eugene,

So what would you advise for a preconditioner instead of PCG and GAMG
for asymetric matrices?

Rgds

Pvc

eugene September 20, 2007 05:53

For asymmetric matrices I gene
 
For asymmetric matrices I generally use the smoothSolver with GaussSeidel smoother.

immortality January 26, 2013 17:01

any information about GAMG solver and its coefficients?


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