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Please Help! (Fluent Error)

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Old   December 18, 2003, 00:50
Default Please Help! (Fluent Error)
  #1
John
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Hi.

Sometimes, when I run iterations in Fluent 6.0, I obtain this error statement:

Error: > (greater-than):invalid argument [2]:wrong type [not a number] Error Object: nanOx7ffffe00

May i know what's the meaning of this error? How to resolve it??

Regards
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Old   December 18, 2003, 05:20
Default Re: Please Help! (Fluent Error)
  #2
Erwin
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I have seen the same thing. Very mysterious. It seems to have something to do with the residuals, but I don't know what. The only way I have managed to resolve is to initialize again and restart the calculations.
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Old   December 18, 2003, 05:36
Default Re: Please Help! (Fluent Error)
  #3
Andrew Garrard
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When you recieve an error with NAN or not a number, it usually means that one on of the variables has increased to beyond the limits of FLUENT. It could mean that you have a divergent system do to one of the constants you set. Have a look at the residuals and see if one of them shoots up at the time of your error.
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Old   December 18, 2003, 13:56
Default Re: Please Help! (Fluent Error)
  #4
Erwin
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I have a question for you: did this error occur after you repartitioned an existing case file and tried to continue the iterations??
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Old   December 21, 2003, 07:48
Default Re: Please Help! (Fluent Error)
  #5
Venkatesh
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Did you got any warning message before getting this error message ? You will get this error message when the flow variables reach unrealistic values (eg: pressure reaching zero or density reaching zero). One way to handle is that limit the flow variable values with in limits( you will be have a rough idea of what the values of pressure ??).

And start the analysis with low under relaxation values ..
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Old   January 5, 2004, 05:02
Default Re: Please Help! (Fluent Error)
  #6
sijal ahmed
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Venkatesh is quit right
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