Multigrid in OpenFOAM??

Benzaa · April 9, 2009, 19:40

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, 03:23

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, 03:27

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, 04:55

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

April 9, 2009, 19:40	Multigrid in OpenFOAM??	#1
Benzaa New Member Fernando Herrera Join Date: Mar 2009 Posts: 18 Rep Power: 17	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??

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April 10, 2009, 03:23		#2
caw Member Christian Winkler Join Date: Mar 2009 Location: Mannheim, Germany Posts: 63 Rep Power: 17	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

April 10, 2009, 03:27		#3
matejfor Senior Member matej forman Join Date: Mar 2009 Location: Brno, Czech Republic Posts: 182 Rep Power: 17	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

April 10, 2009, 04:55		#4
Benzaa New Member Fernando Herrera Join Date: Mar 2009 Posts: 18 Rep Power: 17	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