# Fatal overflow in linear solution

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 March 26, 2007, 14:19 Fatal overflow in linear solution #1 Ravi Guest   Posts: n/a 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

 March 26, 2007, 16:09 Re: Fatal overflow in linear solution #2 Juan Catelén Guest   Posts: n/a Within Advice on flow Modelling, on the manual, you will find some recommendations to see what to do with this kind of errors.

 March 27, 2007, 03:13 Re: Fatal overflow in linear solution #3 Ravi Guest   Posts: n/a 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

 March 27, 2007, 08:36 Re: Fatal overflow in linear solution #4 Juan Catelén Guest   Posts: n/a 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?

 March 27, 2007, 13:35 Re: Fatal overflow in linear solution #5 Ravi Guest   Posts: n/a 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

 March 27, 2007, 20:08 Re: Fatal overflow in linear solution #6 Johnny Guest   Posts: n/a Try a finer mesh, smaller timestep, and double checking your boundary conditions to ensure you haven't set things up backwards.

 March 29, 2007, 06:44 Re: Fatal overflow in linear solution #7 Ravi Guest   Posts: n/a 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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