Error: floating point exception & Error Object: #f

brucewayne123 · December 28, 2017, 04:43

Hello all!

In short, I'm trying to simulate my winglet design in a subsonic (Ma=0.3), incompressible flow.

I kept getting the errors listed on the title of this thread. It seems that my model is diverging.

I'd planned to use hybrid initialization in order to get a more realistic guess, as mentioned by ANSYS, but the errors keep popping out. I had also tried standard initialization and compute from "Inlet", but still getting the floating point exception error.

I'd also checked back my mesh, but the skewness and orthogonal quality seems fine.

One thing I'm not sure is that whether it is due to my usage of pressure far field boundary condition, instead of the using the most general velocity inlet and pressure outlet boundary conditions. Since the maximum speed at subsonic range will achieve Mach number of 0.3, I don't think this is the issue though.

Any advice on how to get my simulation going?

https://www.dropbox.com/s/36chdyit8a...files.zip?dl=0

Edit:
I just noticed that whenever I use hybrid initialization for this case a warning keeps pop out "Warning: flonum_arg detected NaN. Trying to continue with it.". Does anyone know what Fluent mean?

MajaB · January 10, 2018, 07:13

Hi,
it looks like a mesh problem. Check other quality indicators, like negative elements.
You can also try to improve mesh automatically in Fluent but it doesn't always help.

esha · April 27, 2019, 12:04

Hi, I also have the same problem for a transient case . I am using UDF for calculating the polymer additive solution over a cylinder in 2D. when I have tested model for a Newtonian incompressible, viscous fluid, it is working. but as I am using UDF, It gives me a floating point exception for default relaxation factors as well as minimizing these values for a particular time. Such as using courant number 200-400 and pressure and momentum factors minimized from 0.75-0.3. Maybe I am not clear in reporting the problem here. So any information you need to know about my problem to resolve it. I would like to share.

梁不凉 · April 1, 2022, 12:50

您好，我也遇到了和您类似的问题，我运用的是expression，出现了和您一样的错误提示，请问您后来解决这个问题了吗？

December 28, 2017, 04:43	Error: floating point exception & Error Object: #f	#1
brucewayne123 New Member GGWPEZ Join Date: Dec 2017 Posts: 8 Rep Power: 8	Hello all! In short, I'm trying to simulate my winglet design in a subsonic (Ma=0.3), incompressible flow. I kept getting the errors listed on the title of this thread. It seems that my model is diverging. I'd planned to use hybrid initialization in order to get a more realistic guess, as mentioned by ANSYS, but the errors keep popping out. I had also tried standard initialization and compute from "Inlet", but still getting the floating point exception error. I'd also checked back my mesh, but the skewness and orthogonal quality seems fine. One thing I'm not sure is that whether it is due to my usage of pressure far field boundary condition, instead of the using the most general velocity inlet and pressure outlet boundary conditions. Since the maximum speed at subsonic range will achieve Mach number of 0.3, I don't think this is the issue though. Any advice on how to get my simulation going? https://www.dropbox.com/s/36chdyit8a...files.zip?dl=0 Edit: I just noticed that whenever I use hybrid initialization for this case a warning keeps pop out "Warning: flonum_arg detected NaN. Trying to continue with it.". Does anyone know what Fluent mean? Last edited by brucewayne123; December 28, 2017 at 04:53. Reason: I saw some warning when using hybrid initialization

April 1, 2022, 12:50	Error: floating point exception Object: #f	#4
梁不凉 New Member 阿梁 Join Date: Apr 2022 Posts: 1 Rep Power: 0	您好，我也遇到了和您类似的问题，我运用的是expression，出现了和您一样的错误提示，请问您后来解决这个问题了吗？

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January 10, 2018, 07:13		#2
MajaB New Member Join Date: Jul 2016 Posts: 6 Rep Power: 10	Hi, it looks like a mesh problem. Check other quality indicators, like negative elements. You can also try to improve mesh automatically in Fluent but it doesn't always help.

April 27, 2019, 12:04		#3
esha Member Join Date: Aug 2018 Posts: 90 Rep Power: 8	Hi, I also have the same problem for a transient case . I am using UDF for calculating the polymer additive solution over a cylinder in 2D. when I have tested model for a Newtonian incompressible, viscous fluid, it is working. but as I am using UDF, It gives me a floating point exception for default relaxation factors as well as minimizing these values for a particular time. Such as using courant number 200-400 and pressure and momentum factors minimized from 0.75-0.3. Maybe I am not clear in reporting the problem here. So any information you need to know about my problem to resolve it. I would like to share.