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Old   July 14, 2000, 13:00
Default Porous media
  #1
Alberto
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Hi,

I am trying to introduce a porous media zone in my problem of natural circulation. I know the pressure drop in this zone. But when I am trying to introduce the porous media zone, I have this error message:

Error: Internal error at line 562 in file 'amgif.c'. divergence detected in AMG solver Error Object: ()

Could anyone help me?

Maybe anyone knows what FLUENT tutorial treats this problem.

Thank you

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Old   July 15, 2000, 16:19
Default Re: Porous media
  #2
Rüdiger Schwarze
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Your problem isn't stable - some of the variables change rapidly and the solution doesn't converge. May be You will have success by reducing the relaxation factors.
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Old   July 17, 2000, 03:14
Default Re: Porous media
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Gualtiero Guadagni
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Please note that you cannot use the PISO scheme with porous medium.
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Old   July 17, 2000, 03:34
Default Re: Porous media
  #4
Alberto
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Thank you very much,

I have use another discretization scheme, and it works.

Thank you once more
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Old   July 20, 2000, 05:47
Default Re: Porous media
  #5
patxi
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You also have to take in account that if the drop pressure is big - you should run Fluent in double precision

f.e.:

fluent -2ddp
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