Learning Forum

[davidobembe]

I've been trying to Run calculations on my model in Ansys fluent and it keeps coming back to me with a message saying 'floating point exception' i'm not exactly sure what i'm doing wrong! are there any tips that could help or is is there a problem with my boundary conditions 

[Rob]

Floating point can mean a divide by zero is occurring somewhere. Check the mesh quality (skewness under 0. and also the boundary conditions & models.

 

As an aside, this would be better in the Physics -> Fluids part of the forum. I'll move it tomorrow.

[Keyur Kanade]

moving to fluid dynamics. 

please check the mesh quality. 

please insert some images for the mesh and your set up. 

[davidobembe]

hello thanks for getting back to me, i checked and improved mesh qulity but that didn't work either. Here's a screenshot of what i'm doing.

 

[Amine Ben Hadj Ali]

Can you add more information: Does it happen right away or after something? Do you have dynamic Mesh? Are you using UDF's? Please add more details otherwise we cannot provide any help here.

[Rokual]

Hello, I think I got the same problem.

* It happens right away during the calculation
* I don't have a dynamic mesh
* I don't' know what UDF is

 

My mesh:

 

[Rokual]

I created a new message for this issue at:
/forum/forums/topic/divergence-detected-in-amg-solver-and-floating-point-exception-in-ansys-fluent/

 

[Alexis OB]

[Alexis OB]

[Alexis OB]

Hello everyone, excuse me I'm having an «error object... floating point exception » issue with my calculations and I don't know how to fix it. 

The calculation process goes on for a couple of minutes (about 10) then it stops and I get that message. 

I'm simulating a fluid flow (oil and gas separation in a cyclone) using ANSYS Fluent. 

Thanks for answering 

[Eman Basheir]

Hello everyone, excuse me I'm having an «error object... floating point exception » . 

The calculation process goes for a while then it stops and I get that message. 

I'm simulating a fluid flow (biomass byrolysis) using ANSYS Fluent. Kindly see the following error massage:

Divergence detected in AMG solver: pressure correction Stabilizing k to enhance linear solver robustness.

Stabilizing k using GMRES to enhance linear solver robustness.

 

Divergence detected in AMG solver: k Stabilizing epsilon to enhance linear solver robustness.

Stabilizing epsilon using GMRES to enhance linear solver robustness.

 

Divergence detected in AMG solver: epsilon Stabilizing gas-species-0 to enhance linear solver robustness.

Stabilizing gas-species-3 to enhance linear solver robustness.

Stabilizing gas-species-4 to enhance linear solver robustness.

Stabilizing gas-species-5 to enhance linear solver robustness.

Stabilizing gas-species-6 to enhance linear solver robustness.

Stabilizing temperature to enhance linear solver robustness.

Stabilizing temperature using GMRES to enhance linear solver robustness.

temperature limited to 1.000000e+00 in 99842 cells on zone 4 in domain 2

temperature limited to 1.000000e+00 in 99842 cells on zone 4 in domain 3

temperature limited to 1.000000e+00 in 99842 cells on zone 4 in domain 4

Stabilizing vof-1 to enhance linear solver robustness.

Stabilizing vof-1 using GMRES to enhance linear solver robustness.

 

Divergence detected in AMG solver: vof-1 Stabilizing vof-2 to enhance linear solver robustness.

Stabilizing vof-2 using GMRES to enhance linear solver robustness.

 

Divergence detected in AMG solver: vof-2

 

WARNING: Invalid cp (0.00

0===============Message from the Cortex Process================================

 

 

Error at Node 3: floating point exception

Compute processes interrupted. Processing can be resumed.

 

000e==============================================================================

 

+Error at Node 2: floating point exception

 

Error at Node 1: floating point exception

00

Error at Node 0: floating point exception

J/kgK) for carbon-solid at temperature -nan(ind) K

Thanks

[Rob]

Please post a new thread as it's going to be a fairly long one while we work through the problems and their cause. In the new thread please add what models you have switched on, ie phase, chemistry, turbulence etc.