{"id":318266,"date":"2023-11-17T21:09:51","date_gmt":"2023-11-17T21:09:51","guid":{"rendered":"\/forum\/forums\/topic\/axisymmetric-jet-nozzle\/"},"modified":"2023-11-17T21:09:51","modified_gmt":"2023-11-17T21:09:51","slug":"axisymmetric-jet-nozzle","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/axisymmetric-jet-nozzle\/","title":{"rendered":"Axisymmetric Jet Nozzle"},"content":{"rendered":"

Hello, <\/p>\n

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,<\/p>\n

<\/p>\n

 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)<\/p>\n

<\/p>\n

 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<\/p>\n

 <\/p>\n

Hybrid initialization is done.<\/p>\n

 <\/p>\n

Writing Settings file “C:\\Users\\bbaca\\AppData\\Local\\Temp\\WB_bbaca_19128_2\\wbnew_files\\dp0\\FFF\\Fluent\\lmesh.set”…<\/p>\n

writing rp variables … Done.<\/p>\n

writing domain variables … Done.<\/p>\n

writing fluid (type fluid) (mixture) … Done.<\/p>\n

writing periodic_low-face_high-face (type periodic) (mixture) … Done.<\/p>\n

writing high-face (type periodic) (mixture) … Done.<\/p>\n

writing int_fluid (type interior) (mixture) … Done.<\/p>\n

writing pressure-far-field (type pressure-far-field) (mixture) … Done.<\/p>\n

writing jet-wall (type wall) (mixture) … Done.<\/p>\n

writing jet-inlet (type pressure-inlet) (mixture) … Done.<\/p>\n

writing outlet (type pressure-outlet) (mixture) … Done.<\/p>\n

writing symmetry (type symmetry) (mixture) … Done.<\/p>\n

writing zones map name-id … Done.<\/p>\n

 <\/p>\n

 <\/p>\n

iter continuity x-velocity y-velocity z-velocity energy nut time\/iter<\/p>\n

 <\/p>\n

===============Message from the Cortex Process================================<\/p>\n

 <\/p>\n

Compute processes interrupted. Processing can be resumed.<\/p>\n

 <\/p>\n

==============================================================================<\/p>\n

 <\/p>\n

Error at Node 1: Divergence detected in AMG solver<\/p>\n

 <\/p>\n

Divergence detected – temporarily reducing Courant number to 0.5<\/p>\n

and trying again…<\/p>\n

 <\/p>\n

Divergence detected – temporarily reducing Courant number to 0.05<\/p>\n

and trying again…<\/p>\n

 <\/p>\n

Divergence detected – temporarily reducing Courant number to 0.005<\/p>\n

and trying again…<\/p>\n

 <\/p>\n

Divergence detected – temporarily reducing Courant number to 0.0005<\/p>\n

and trying again…<\/p>\n

Stabilizing Coupled to enhance linear solver robustness.<\/p>\n

Stabilizing Coupled using GMRES to enhance linear solver robustness.<\/p>\n

 <\/p>\n

Divergence detected – temporarily reducing Courant number to 5e-05<\/p>\n

and trying again…<\/p>\n

Stabilizing Coupled to enhance linear solver robustness.<\/p>\n

Stabilizing Coupled using GMRES to enhance linear solver robustness.<\/p>\n

 <\/p>\n

Error at Node 0: Divergence detected in AMG solver<\/p>\n

Writing “| gzip -2cf > SolutionMonitor.gz”…<\/p>\n

Writing temporary file C:\\Users\\bbaca\\AppData\\Local\\Temp\\flntgz-43722 …<\/p>\n

Done.<\/p>\n

 <\/p>\n

 <\/p>\n

Calculation complete.<\/p>\n

 <\/p>\n

I am not sure is the mesh file is okay that’s why I am attaching my mesh file as well.<\/p>\n

https:\/\/drive.google.com\/drive\/folders\/1MtyQbhZGmYC3-zDd5ZbaXUh3hXFnkjqk?usp=drive_link<\/p>\n","protected":false},"template":"","class_list":["post-318266","topic","type-topic","status-closed","hentry","topic-tag-fluent-cfd-ansys-1","topic-tag-error","topic-tag-fluent-mesh"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t