Floating point exception(divided by zero)

jgeng · June 9, 2013, 03:41

I am using CCM+ to do the underhood analysis. The cells are around 34 million. But there is always an error 'Floating point exception error (divided by zero)' .

The situation is:
1) This error happens before the 1st iteration.
2) I already checked and remove the invalid cells (cell quality>1e-6, volume change>1e-4 etc.)
3) I checked all the boudary conditions, there should be no problem.

So I really have no idea how to solve the problem. Can you help me?

Thanks.

nnh · June 16, 2013, 00:01

Are you using Cell Quality remidiation? If yes, then are there any disconnected cells in the fluid regions? Answers to these questions would be helpful in debugging your problem.

olauer · July 10, 2013, 05:17

Do you use annotations referencing a report? Which version of CCM+?

husker · July 11, 2013, 01:46

You should consider checking the reports.

Paulh · July 15, 2013, 13:04

As others have mentioned, checking cell quality is a good place to start. However, consider checking for non-contiguous volumes in your Regions. You might have a small volume disconnected from the rest of your domain that is causing the catastrophic failure. If that's the case, you could check the underlying geometry to see what is causing the problem. In the past, I have 'fixed' this problem by tweaking the wrapper scaling factor. Good luck!

June 9, 2013, 03:41	Floating point exception(divided by zero)	#1
jgeng New Member Jie Geng Join Date: Jun 2013 Posts: 1 Rep Power: 0	I am using CCM+ to do the underhood analysis. The cells are around 34 million. But there is always an error 'Floating point exception error (divided by zero)' . The situation is: 1) This error happens before the 1st iteration. 2) I already checked and remove the invalid cells (cell quality>1e-6, volume change>1e-4 etc.) 3) I checked all the boudary conditions, there should be no problem. So I really have no idea how to solve the problem. Can you help me? Thanks.

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June 16, 2013, 00:01		#2
nnh New Member Join Date: Jun 2013 Posts: 1 Rep Power: 0	Are you using Cell Quality remidiation? If yes, then are there any disconnected cells in the fluid regions? Answers to these questions would be helpful in debugging your problem.

July 10, 2013, 05:17		#3
olauer Member Oliver Lauer Join Date: Mar 2009 Location: Coburg Posts: 57 Rep Power: 17	Do you use annotations referencing a report? Which version of CCM+?

July 11, 2013, 01:46		#4
husker Member Join Date: Mar 2009 Posts: 85 Rep Power: 17	You should consider checking the reports.

July 15, 2013, 13:04		#5
Paulh Member Paul Hancock Join Date: Mar 2009 Location: Bellingham, WA Posts: 31 Rep Power: 17	As others have mentioned, checking cell quality is a good place to start. However, consider checking for non-contiguous volumes in your Regions. You might have a small volume disconnected from the rest of your domain that is causing the catastrophic failure. If that's the case, you could check the underlying geometry to see what is causing the problem. In the past, I have 'fixed' this problem by tweaking the wrapper scaling factor. Good luck!