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Old   May 19, 2006, 04:59
Default Error Message in Fluent
  #1
Tang Kuei
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Staggered, lam, 2D, with 2 uds. After several iterations, a error message comes out as follow, "divergence detected in AMG solver: uds-1"

What can I do for this problem?

When I try to use coupled method, I will never meet this condition.

cheers,
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Old   May 19, 2006, 07:03
Default Re: Error Message in Fluent
  #2
Siddharth Khowala
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hi, i think there might be some problem with your first UDF,Just use the first UDF in isolation without using the other one in segregated solver.Divergence errors are generally observed when a quantity is being divided by zero.These errors i have experienced hence i think might be the case.Just check your udf ,if at the time of running your code somevalue becomes 0 and is it dividing something,then that might be the problem maybe u can write the entire data in a file and check them.Hope it helps

regards

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Old   May 19, 2006, 09:12
Default Re: Error Message in Fluent
  #3
TengKuei
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My diffusivity and property are temperature dependent, so I need to do the iteration with coupled method?
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Old   May 19, 2006, 09:41
Default Re: Error Message in Fluent
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Siddharth Khowala
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hi I meant to say that if u have got to use both the udf together then it would be better to write the output in a file and check if any quantity in your first udf is being divided by zero by checking the files.

regards
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Old   May 19, 2006, 10:14
Default Re: thanks for your adivce
  #5
TengKuei
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Dear sir,

Thank you very much!! I'm tryin' to do that

Regards,
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