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-   -   Fatal overflow in linear solution (http://www.cfd-online.com/Forums/cfx/23794-fatal-overflow-linear-solution.html)

Ravi March 26, 2007 14:19

Fatal overflow in linear solution
 
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

Juan Catelén March 26, 2007 16:09

Re: Fatal overflow in linear solution
 
Within Advice on flow Modelling, on the manual, you will find some recommendations to see what to do with this kind of errors.

Ravi March 27, 2007 03:13

Re: Fatal overflow in linear solution
 
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

Juan Catelén March 27, 2007 08:36

Re: Fatal overflow in linear solution
 
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?

Ravi March 27, 2007 13:35

Re: Fatal overflow in linear solution
 
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

Johnny March 27, 2007 20:08

Re: Fatal overflow in linear solution
 
Try a finer mesh, smaller timestep, and double checking your boundary conditions to ensure you haven't set things up backwards.

Ravi March 29, 2007 06:44

Re: Fatal overflow in linear solution
 
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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