TAGGED: #fluent-#cfd-#ansys, error, fluent-mesh
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November 17, 2023 at 9:09 pmcem bizSubscriber
Hello,Â
I am a master's student and I am trying to do a validation case for an Axisymmetric subsonic Jet Nozzle. Since I am a beginner in Ansys, although the initial case is periodic as shown below,
 I did start with the 2D case to get used to meshing and software. Then I solved the 2D case and got good results compared to NASA. Then I exported my mesh to ICEM CFD to rotate it 1 degree and solved it again with fluent (shown below)
 however, this time I couldn't perform the mesh check in the beginning, and couldn't calculate it every time I tried to calculate it gave an error below
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Hybrid initialization is done.
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Writing Settings file "C:\Users\bbaca\AppData\Local\Temp\WB_bbaca_19128_2\wbnew_files\dp0\FFF\Fluent\lmesh.set"...
writing rp variables ... Done.
writing domain variables ... Done.
writing fluid (type fluid) (mixture) ... Done.
writing periodic_low-face_high-face (type periodic) (mixture) ... Done.
writing high-face (type periodic) (mixture) ... Done.
writing int_fluid (type interior) (mixture) ... Done.
writing pressure-far-field (type pressure-far-field) (mixture) ... Done.
writing jet-wall (type wall) (mixture) ... Done.
writing jet-inlet (type pressure-inlet) (mixture) ... Done.
writing outlet (type pressure-outlet) (mixture) ... Done.
writing symmetry (type symmetry) (mixture) ... Done.
writing zones map name-id ... Done.
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iter continuity x-velocity y-velocity z-velocity energy nut time/iter
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===============Message from the Cortex Process================================
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Compute processes interrupted. Processing can be resumed.
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==============================================================================
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Error at Node 1: Divergence detected in AMG solver
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Divergence detected - temporarily reducing Courant number to 0.5
and trying again...
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Divergence detected - temporarily reducing Courant number to 0.05
and trying again...
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Divergence detected - temporarily reducing Courant number to 0.005
and trying again...
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Divergence detected - temporarily reducing Courant number to 0.0005
and trying again...
Stabilizing Coupled to enhance linear solver robustness.
Stabilizing Coupled using GMRES to enhance linear solver robustness.
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Divergence detected - temporarily reducing Courant number to 5e-05
and trying again...
Stabilizing Coupled to enhance linear solver robustness.
Stabilizing Coupled using GMRES to enhance linear solver robustness.
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Error at Node 0: Divergence detected in AMG solver
Writing "| gzip -2cf > SolutionMonitor.gz"...
Writing temporary file C:\Users\bbaca\AppData\Local\Temp\flntgz-43722 ...
Done.
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Calculation complete.
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I am not sure is the mesh file is okay that's why I am attaching my mesh file as well.
https://drive.google.com/drive/folders/1MtyQbhZGmYC3-zDd5ZbaXUh3hXFnkjqk?usp=drive_link
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November 21, 2023 at 11:16 amRobForum Moderator
I suspect the 1 degree rotation isn't helping as you'll have a very skew cell at the axis. Try with a 30 degree sector. However, unless you model the full 360 zone I'd expect 2d-axi and the 3d sector to be near enough identical. The only reason a full model may differ is when the jet isn't stable and a lack of constraints will allow it to move if it's inclined to do so.Â
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November 28, 2023 at 5:45 pmcem bizSubscriber
I solved the issue by using the workbench>tool> appearance>anable beta option, created a symmetry on the meshing, and changed the type to axisymmetric on symmetry. This enabled me to have a degree with how many elements I want in between. Now it works all fine. I think importing a mesh to Ansys should be improved because I tried many ways to do it but I couldn't do it in the end. And thank you Rob, but I have to validate the case from NASA for my project, so it's not possible for me to apply any other way. Thank you for your valuable comment.
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- The topic ‘Axisymmetric Jet Nozzle’ is closed to new replies.
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