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Old   March 26, 2007, 14:19
Default Fatal overflow in linear solution
  #1
Ravi
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Frds, I am solving a pipe flow problem in CFX but i am getting an error in solver, the message shown after failure is "ERROR #004100018 has occurred in subroutine FINMES. Message: Fatal overflow in linear solver." Please if anybdy has idea abt it pls help.

Thanks Ravi
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Old   March 26, 2007, 16:09
Default Re: Fatal overflow in linear solution
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Juan Catelén
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Within Advice on flow Modelling, on the manual, you will find some recommendations to see what to do with this kind of errors.
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Old   March 27, 2007, 03:13
Default Re: Fatal overflow in linear solution
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Ravi
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I am not really clear about the solution given in solver advice. if i change the outlet boundary to opening boundary, the solver solves the problem but when i draw the velocity vector the direction of vector is opposite to the expected one and which i feel is not the realistic one. so please let me know somthg more abt it....

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Old   March 27, 2007, 08:36
Default Re: Fatal overflow in linear solution
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Juan Catelén
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You should simplify the model, at least until you find a good result and then you will be able too add more complexity. Could it be that there is a reflux next to the outlet? Can you move away the outlet? Can you describe to me better the system?
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Old   March 27, 2007, 13:35
Default Re: Fatal overflow in linear solution
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Ravi
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I am not really clear about the solution given in solver advice. if i change the outlet boundary to opening boundary, the solver solves the problem but when i draw the velocity vector the direction of vector is opposite to the expected one and which i feel is not the realistic one. so please let me know somthg more abt it....

Thanks Ravi
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Old   March 27, 2007, 20:08
Default Re: Fatal overflow in linear solution
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Johnny
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Try a finer mesh, smaller timestep, and double checking your boundary conditions to ensure you haven't set things up backwards.
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Old   March 29, 2007, 06:44
Default Re: Fatal overflow in linear solution
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Ravi
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Thanks Frds,

I tried with finer mesh and readjusted the outlet to further distance and the solution obtained was very good. The guidance worked out. Thankyou so much......
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