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-   -   overflow problem (http://www.cfd-online.com/Forums/cfx/94036-overflow-problem.html)

keeper November 3, 2011 11:52

overflow problem
 
hello everyone,

================================================== ====================
OUTER LOOP ITERATION = 1 CPU SECONDS = 1.198E+03
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| Wallscale | 0.00 | 2.2E-03 | 2.9E-02 | 29.3 8.9E-02 OK|
+----------------------+------+---------+---------+------------------+

Parallel run: Received message from slave
-----------------------------------------
Slave partition : 3
Slave routine : ErrAction
Master location : RCVBUF,MSGTAG=1033
Message label : 001100279
Message follows below - :

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Floating point exception: Overflow |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

Parallel run: Received message from slave
-----------------------------------------
Slave partition : 3
Slave routine : ErrAction
Master location : RCVBUF,MSGTAG=1033
Message label : 001100279
Message follows below - :

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine FPX: C_FPX_HANDLER |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 1. No results file |
| has been created. |
+--------------------------------------------------------------------+

End of solution stage.




I have a question. I always recieve this error from the solver and my question is:

Does this message mean something certain or it is common message and can express any "bad setting"???


Thank all of you for any answers.

ghorrocks November 3, 2011 17:46

I need to write an FAQ on this, answered it hundreds of times.

Overflow error means the solver has diverged big-time. You need to improve the numerical stability. This could be improve mesh quality, better initial conditions, improperly set boundary conditions or physics. On rare occasions you need double precision numerics.


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