What is : 1.#QNBe+00

MASOUD · January 11, 2011, 20:00

I got the following error under convergence history of a UDS:

1.#QNBe+00

I am wondering why this occurs and how I can fix it

Thanks

qiulan · December 30, 2011, 23:21

Hi!

I encounterd the same problem. Have you solved it? Could you tell me how to solve it? Thank you very much!

duri · December 31, 2011, 06:45

Some floating point error may be ap is going to zero or sqrt of some negative value. You need to investigate it.

qiulan · January 3, 2012, 07:31

Than you very much! Could you tell me what you usually investigate in this case? The quality of the mesh or the boundary conditions? Thank you again!

duri · January 3, 2012, 14:58

Check boundary condition for zero or negative values and also UDF (if any)

qiulan · January 8, 2012, 08:49

Ok, thank you very much!

qiulan · January 8, 2012, 08:54

By the way, I have done successfully for two phases, but failed when the third phase which is anologious to one of the previous phases was added. I don't know why since their boundary conditions and UDF are almost the same except for little change of the value. Any suggestion will be appreciated. Thank you very much!

January 11, 2011, 20:00	What is : 1.#QNBe+00	#1
MASOUD Senior Member MASOUD Join Date: Mar 2009 Posts: 102 Rep Power: 17	I got the following error under convergence history of a UDS: 1.#QNBe+00 I am wondering why this occurs and how I can fix it Thanks

December 30, 2011, 23:21		#2
qiulan New Member Qiulan Zeng Join Date: Sep 2010 Posts: 18 Rep Power: 16	Hi! I encounterd the same problem. Have you solved it? Could you tell me how to solve it? Thank you very much!

December 31, 2011, 06:45		#3
duri Senior Member duri Join Date: May 2010 Posts: 245 Rep Power: 17	Some floating point error may be ap is going to zero or sqrt of some negative value. You need to investigate it.

January 3, 2012, 07:31		#4
qiulan New Member Qiulan Zeng Join Date: Sep 2010 Posts: 18 Rep Power: 16	Than you very much! Could you tell me what you usually investigate in this case? The quality of the mesh or the boundary conditions? Thank you again!

January 3, 2012, 14:58		#5
duri Senior Member duri Join Date: May 2010 Posts: 245 Rep Power: 17	Check boundary condition for zero or negative values and also UDF (if any)

January 8, 2012, 08:49		#6
qiulan New Member Qiulan Zeng Join Date: Sep 2010 Posts: 18 Rep Power: 16	Ok, thank you very much!

January 8, 2012, 08:54		#7
qiulan New Member Qiulan Zeng Join Date: Sep 2010 Posts: 18 Rep Power: 16	By the way, I have done successfully for two phases, but failed when the third phase which is anologious to one of the previous phases was added. I don't know why since their boundary conditions and UDF are almost the same except for little change of the value. Any suggestion will be appreciated. Thank you very much!