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Old   June 29, 2009, 13:52
Default Problem with iterations in Fluent
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Iaroslav
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Hi everyone,

I am having an issue with iterating my solution in Fluent. I am currently running a subsonic impingement case. I am using the density based axisymmetric solver with all boundary conditions defined. The jet is impinged on a flat plate (bottom boundary). There is also a wall around the jet exit (upper boundary). The left boundary is the axis and the right boundary is a pressure outlet. Air is used as an ideal gas with the use of the standard k-e model for turbulent flow.

The issue I am having is when I start to iterate the solution, fluent gives me the following:
Error: Floating point error: invalid number
Error Object: ()

I have attached the case file with this post so you can open it and view all my initial/boundary conditions. I have double checked all my values and I am sure they are absolutely correct. I would appreciate any help on this.

Thank you,
Iaroslav
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File Type: zip impingement_jet_struc_fine.zip (62.7 KB, 11 views)
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Old   June 30, 2009, 08:49
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Iaroslav
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Did anyone get a chance to look at this? Are my boundary conditions incorrect? For some reason, I am able to run the simulation in 2D instead of axisymmetric, but my results are inaccurate.

Thanks,
Iaroslav
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Old   June 30, 2009, 10:32
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Akour
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hi,

floating point error will be something to do with your boundary conditions usually, unless u have a UDF attached, which u dont. Im assuming you are aware that for axisymmetric problems in FLUENT the axis of symmetry MUST be the y axis (I THINK!, please check this in the manual), i.e. you cant just place an axis of symmetry along any coordinate direction you want...the fact that your simulation works using a 2D solver means that you have defined that boundary incorrectly.

AK
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Old   June 30, 2009, 10:53
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Hi AK,

Thanks so much for your help. It turns out that I can to rotate my domain by 90 degrees so the x-axis is my axis.

-Iaroslav
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