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I get the error "Floating point exception: Overflow". What does this mean and what do

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Old   January 17, 2016, 04:17
Default I get the error "Floating point exception: Overflow". What does this mean and what do
  #1
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Ian
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Hi everyone,
This is aerror tips,how to solve it,I have read something about this error's mean,and i have changed boundary conditions,but it still appeaer error,i am prepare to compute changable speed in pump,if rotating speed constant,this error would not appear,please help me!

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
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Old   January 17, 2016, 06:14
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Glenn Horrocks
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FAQ: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F
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Old   January 17, 2016, 07:43
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Ian
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tannk you for replying, i have read this link before you recommend to me,but i have tried some ways ,it's still useless,i simulated a pump working conditions wnich is starting period,rotating speed and mass flow are changing,the formula of rotating speed is y(t) = 12.039t^3 - 81.768t^2 + 188.72t,
CFX calculates six or seven steps will appear this error,How to solve it?thank you!
Parallel run: Received message from slave
-----------------------------------------
Slave partition : 7
Slave routine : ErrAction
Master location : Message Handler
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 : 7
Slave routine : ErrAction
Master location : Message Handler
Message label : 001100279
Message follows below - :

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

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine MESG_RETRIEVE. |
| Message: |
| Stopping the run due to error(s) reported above
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Old   January 17, 2016, 17:30
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Glenn Horrocks
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Quote:
it's still useless
That really encourages me that you have read it and understood it. I (and some other experienced people on this forum) wrote that FAQ because the question really is frequently asked and almost always the approaches listed there are the correct ones to get it working. And almost always when people say "I tried it and nothing worked" it becomes obvious soon enough that they have not read it - or at least not understood it - and the solution to their problem was on the FAQ all along.

Now I will refer you to another FAQ: http://www.cfd-online.com/Wiki/Ansys...ible_answer.3F
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Old   January 17, 2016, 20:42
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Ian
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thank you for helping me,i have solved this problem,i changed time step from 0.001 to 0.0001,it's not appear error tip at present,i think mabe i used mesh motion,in a word,thank you enthusiasm to help!
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Old   January 17, 2016, 21:04
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Glenn Horrocks
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The FAQ says:

Quote:
Does the model require small time steps to start? Some simulations require small time steps to start, but once going the time step can be increased.
That tries to say what you have done, but it might not be completely clear. Maybe I should re-word it to say more clearly that you should try smaller time steps.
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