Floating Point Exception Error

nyox · August 22, 2014, 09:19

I have been getting the same particular error ever since I've tried to run my mesh in Fluent.

Initially, i thought it was because of a bad mesh and I've tried to improve the quality of my mesh as much as possible but I am still getting the same floating point error. Even reducing the under relaxation factor does not help.

Would greatly appreciated if someone can give me some insights, I am truly lost as to what else to do.

This is the full error message;

# Divergence detected in AMG solver: x-momentum -> Increasing relaxation sweeps!

Divergence detected in AMG solver: x-momentum
Divergence detected in AMG solver: y-momentum
Divergence detected in AMG solver: z-momentum
Divergence detected in AMG solver: pressure correction
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: x-momentum
Divergence detected in AMG solver: y-momentum
Divergence detected in AMG solver: z-momentum
Divergence detected in AMG solver: pressure correction
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: x-momentum
Divergence detected in AMG solver: y-momentum
Divergence detected in AMG solver: z-momentum
Divergence detected in AMG solver: pressure correction
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: x-momentum
Divergence detected in AMG solver: y-momentum
Divergence detected in AMG solver: z-momentum
Divergence detected in AMG solver: pressure correction
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Primitive Error at Node 1: floating point exception

Primitive Error at Node 2: floating point exception

Primitive Error at Node 3: floating point exception

Primitive Error at Node 0: floating point exception

Error: floating point exception
Error Object: #f

silverra1n · August 22, 2014, 16:51

Hi!

I have same problem. Do you work parallel solver?

nyox · August 22, 2014, 21:38

Yes I used parallel solver. I believe this has to do with my mesh having negative volume elements.

silverra1n · August 23, 2014, 03:10

I haven't negative volume elements but i get same error. I think it is about parallel solver.

nyox · August 23, 2014, 05:28

Have you been able to figure out the cause of this? It runs Ok in series?

silverra1n · August 23, 2014, 09:14

I have 28 species and wall reactions. So i couldn't get serial solver.i only guess.

nyox · August 23, 2014, 23:38

Is anyone able to help out with this issue?

engineer.iman · January 22, 2016, 01:38

Quote:

Originally Posted by nyox

Is anyone able to help out with this issue?

Did you manage to identify the cause of the error? could you please share how you solved it?
i'm facing the same issue !!!

Dave_88 · January 22, 2016, 07:53

Check your mesh quality for negative volumes, high aspect ratio and so on. Also check your boundary conditions - are they correctly set?

cfd lover · August 18, 2018, 10:21

I faced the same problem and solved it. My domain is axisymmetric and i had not selected all the edges set as axis boundary.I selected the right edge and it disappeared.

operalpha · November 9, 2018, 13:30

Quote:

Originally Posted by cfd lover

I faced the same problem and solved it. My domain is axisymmetric and i had not selected all the edges set as axis boundary.I selected the right edge and it disappeared.

If you want to use a 2D axisymmetric model you have to set the geometry in an special way: The geomery have to be draw in the YX plane and in a way that the rotational axis folows the x direction.

Oula · November 30, 2018, 12:31

Quote:

Originally Posted by cfd lover

I faced the same problem and solved it. My domain is axisymmetric and i had not selected all the edges set as axis boundary.I selected the right edge and it disappeared.

Hi cfd lover, was your geometry a 3D or 2D?

August 22, 2014, 09:19	Floating Point Exception Error	#1
nyox New Member Shane Join Date: Aug 2014 Posts: 10 Rep Power: 12	I have been getting the same particular error ever since I've tried to run my mesh in Fluent. Initially, i thought it was because of a bad mesh and I've tried to improve the quality of my mesh as much as possible but I am still getting the same floating point error. Even reducing the under relaxation factor does not help. Would greatly appreciated if someone can give me some insights, I am truly lost as to what else to do. This is the full error message; # Divergence detected in AMG solver: x-momentum -> Increasing relaxation sweeps! Divergence detected in AMG solver: x-momentum Divergence detected in AMG solver: y-momentum Divergence detected in AMG solver: z-momentum Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: k Divergence detected in AMG solver: epsilon Divergence detected in AMG solver: x-momentum Divergence detected in AMG solver: y-momentum Divergence detected in AMG solver: z-momentum Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: k Divergence detected in AMG solver: epsilon Divergence detected in AMG solver: x-momentum Divergence detected in AMG solver: y-momentum Divergence detected in AMG solver: z-momentum Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: k Divergence detected in AMG solver: epsilon Divergence detected in AMG solver: x-momentum Divergence detected in AMG solver: y-momentum Divergence detected in AMG solver: z-momentum Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: k Divergence detected in AMG solver: epsilon Primitive Error at Node 1: floating point exception Primitive Error at Node 2: floating point exception Primitive Error at Node 3: floating point exception Primitive Error at Node 0: floating point exception Error: floating point exception Error Object: #f silverra1n and H.Salimi like this.

January 22, 2016, 07:53		#9
Dave_88 New Member Dave M. Join Date: Aug 2014 Location: Koblenz, Germany Posts: 14 Rep Power: 12	Check your mesh quality for negative volumes, high aspect ratio and so on. Also check your boundary conditions - are they correctly set? Oula likes this.

August 18, 2018, 10:21	solution	#10
cfd lover New Member Ali Mohammadi Join Date: Oct 2017 Posts: 15 Rep Power: 9	I faced the same problem and solved it. My domain is axisymmetric and i had not selected all the edges set as axis boundary.I selected the right edge and it disappeared. Oula likes this.

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August 22, 2014, 16:51		#2
silverra1n Member şakir Join Date: Mar 2012 Posts: 30 Rep Power: 14	Hi! I have same problem. Do you work parallel solver?

August 22, 2014, 21:38		#3
nyox New Member Shane Join Date: Aug 2014 Posts: 10 Rep Power: 12	Yes I used parallel solver. I believe this has to do with my mesh having negative volume elements.

August 23, 2014, 03:10		#4
silverra1n Member şakir Join Date: Mar 2012 Posts: 30 Rep Power: 14	I haven't negative volume elements but i get same error. I think it is about parallel solver.

August 23, 2014, 05:28		#5
nyox New Member Shane Join Date: Aug 2014 Posts: 10 Rep Power: 12	Have you been able to figure out the cause of this? It runs Ok in series?

August 23, 2014, 09:14		#6
silverra1n Member şakir Join Date: Mar 2012 Posts: 30 Rep Power: 14	I have 28 species and wall reactions. So i couldn't get serial solver.i only guess.

August 23, 2014, 23:38		#7
nyox New Member Shane Join Date: Aug 2014 Posts: 10 Rep Power: 12	Is anyone able to help out with this issue?