CFX error, "Floating point exception"

moca · July 17, 2009, 10:37

I am trying to model wind turbine in CFX. During the run (first iteration), i am getting the error message:
Floating Point Exception: Overflow
What's wrong with my simulation??? Thank you

Tushar@cfd · July 17, 2009, 11:42

check your mesh again, this kind of error usually comes when during Pre-processing in CFX some wrong initial parameters are used....

Can you please give me more information about your work. Will see to it...

regards,
Tushar

smn · July 18, 2009, 03:03

hi:
i think think this error is due to the memory,,,try 64bit ansys...

Tushar@cfd · July 18, 2009, 08:41

smn is some what right....one of the reason i guess would be, you might have allocated less memory... Give it a parallel run, allocate more memory too... your problem will be solved definately....

regards..

ghorrocks · July 20, 2009, 03:18

Sorry but nobody has posted the correct answer here yet. Floating point exceptions are signs that your simulation has diverged big-time. Either the physics is wrong or the numerics are wildly unstable.

It has nothing to do with 32/64 bit.

Glenn Horrocks

moca · July 20, 2009, 11:05

Thank you Mr. Glenn Horrocks, so what should I do?

bharath · July 20, 2009, 14:10

hi,
Either your mesh quality or the physics must be wrong.please check it

ghorrocks · July 20, 2009, 19:48

Hi,

First you should check that the physics of your simulation are correct. It is common to fail to get convergence on something which is not physically possible.

After that is OK and you still have convergence problems then you should look into numerical reasons for the divergence. Read the documentation about "obtaining convergence". Mesh quality is one issue but there are many others.

Glenn Horrocks

moca · July 23, 2009, 08:58

ok, thanks all

July 17, 2009, 10:37	CFX error, "Floating point exception"	#1
moca New Member tato Join Date: Jul 2009 Posts: 13 Rep Power: 17	I am trying to model wind turbine in CFX. During the run (first iteration), i am getting the error message: Floating Point Exception: Overflow What's wrong with my simulation??? Thank you

July 17, 2009, 11:42	its an error	#2
Tushar@cfd Senior Member T. Chourushi Join Date: Jul 2009 Posts: 321 Blog Entries: 1 Rep Power: 18	check your mesh again, this kind of error usually comes when during Pre-processing in CFX some wrong initial parameters are used.... Can you please give me more information about your work. Will see to it... regards, Tushar

July 18, 2009, 08:41	smn is some what right....one of the reason i guess would be	#4
Tushar@cfd Senior Member T. Chourushi Join Date: Jul 2009 Posts: 321 Blog Entries: 1 Rep Power: 18	smn is some what right....one of the reason i guess would be, you might have allocated less memory... Give it a parallel run, allocate more memory too... your problem will be solved definately.... regards..

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July 18, 2009, 03:03		#3
smn Member Join Date: Jun 2009 Posts: 56 Rep Power: 17	hi: i think think this error is due to the memory,,,try 64bit ansys...

July 20, 2009, 03:18		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Sorry but nobody has posted the correct answer here yet. Floating point exceptions are signs that your simulation has diverged big-time. Either the physics is wrong or the numerics are wildly unstable. It has nothing to do with 32/64 bit. Glenn Horrocks

July 20, 2009, 11:05		#6
moca New Member tato Join Date: Jul 2009 Posts: 13 Rep Power: 17	Thank you Mr. Glenn Horrocks, so what should I do?

July 20, 2009, 14:10		#7
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	hi, Either your mesh quality or the physics must be wrong.please check it

July 20, 2009, 19:48		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Hi, First you should check that the physics of your simulation are correct. It is common to fail to get convergence on something which is not physically possible. After that is OK and you still have convergence problems then you should look into numerical reasons for the divergence. Read the documentation about "obtaining convergence". Mesh quality is one issue but there are many others. Glenn Horrocks

July 23, 2009, 08:58		#9
moca New Member tato Join Date: Jul 2009 Posts: 13 Rep Power: 17	ok, thanks all