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-   -   Multigrid in OpenFOAM?? (http://www.cfd-online.com/Forums/openfoam-solving/63493-multigrid-openfoam.html)

Benzaa April 9, 2009 18:40

Multigrid in OpenFOAM??
 
Hi,

a simple question to which I can not find the answer to.

Does openFOAM use a mutigrid technique for the solution of the cells?

Or does it uses something else??

caw April 10, 2009 02:23

This depends on the solver you chose in the fvSolution file.
If you see or use GAMG for pressure equation, then you use an algebraic multigrid solver. In my understanding in the dev version there are more ANG solvers.

best regards
christian

matejfor April 10, 2009 02:27

Hi,
I'm not sure what you mean by 'solution of the cells', but there is a geometric/algebraic multigrid solver: GAMG solver. You will also find info in the documentation which goes with the software.

if you type tut in your console and then "grep -R "GAMG" *" you will get the list of tutorials using it.

good luck
matej

Benzaa April 10, 2009 03:55

Thanks for the answers,

I found what I was looking for.

For a moment, I thought that you could also use an algorithm based on the tri-diagonal matrix algorithm (Thoma's algorithm).

But I think it is too simple for this solver


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