Floating point exception: Invalid number

January 9, 2009, 13:51

I am modeling a transient radiation heat transfer problem. Whenever I tried to run it, the solver crashed. The output files shows: ERROR #001100279 has occurred in subroutine ErrAction. | | Message: | | Floating point exception: Invalid number

My model is in micrometer scale. I don't know if CFX can do modelings in such small scales like that or not. I can't figure out what caused that error. I would like to get some advice from experienced user and I would greatly appreciate any help. Thanks.

Jinfeng

January 10, 2009, 04:49

does it happen after the 1st or some iterations or you have 0 successful iterations? If you have at least some successful iterations please observe the maximal temperature/velocity. May be it tends to infinity?

January 10, 2009, 11:42

The solver crashed at the first iteration. Later, I tried to run a steady state simulation, same thing happened at the first outer loop iteration. Any idea of what's going on?

Thanks, dace!

January 11, 2009, 13:34

1. does it work without radiation heat transfer included? 2. which radiation model you use and what is absorption coeffiecient?

January 11, 2009, 16:44

Hi,

The length scale of your simulation is fine. That is not the cause of the problem. You simulation has diverged. Read the documentation about "obtaining convergence" and also this page this may help:

http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Glenn Horrocks

January 9, 2009, 13:51	Floating point exception: Invalid number	#1
Jinfeng Guest Posts: n/a	I am modeling a transient radiation heat transfer problem. Whenever I tried to run it, the solver crashed. The output files shows: ERROR #001100279 has occurred in subroutine ErrAction. \| \| Message: \| \| Floating point exception: Invalid number My model is in micrometer scale. I don't know if CFX can do modelings in such small scales like that or not. I can't figure out what caused that error. I would like to get some advice from experienced user and I would greatly appreciate any help. Thanks. Jinfeng

January 10, 2009, 04:49	Re: Floating point exception: Invalid number	#2
dace Guest Posts: n/a	does it happen after the 1st or some iterations or you have 0 successful iterations? If you have at least some successful iterations please observe the maximal temperature/velocity. May be it tends to infinity?

January 10, 2009, 11:42	Re: Floating point exception: Invalid number	#3
Jinfeng Guest Posts: n/a	The solver crashed at the first iteration. Later, I tried to run a steady state simulation, same thing happened at the first outer loop iteration. Any idea of what's going on? Thanks, dace!

January 11, 2009, 13:34	Re: Floating point exception: Invalid number	#4
dace Guest Posts: n/a	1. does it work without radiation heat transfer included? 2. which radiation model you use and what is absorption coeffiecient?

January 11, 2009, 16:44	Re: Floating point exception: Invalid number	#5
Glenn Horrocks Guest Posts: n/a	Hi, The length scale of your simulation is fine. That is not the cause of the problem. You simulation has diverged. Read the documentation about "obtaining convergence" and also this page this may help: http://www.cfd-online.com/Wiki/Ansys...gence_criteria Glenn Horrocks

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