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

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.

Please note that you cannot use the PISO scheme with porous medium.

Thank you very much,

I have use another discretization scheme, and it works.

Thank you once more

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