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Convergence issues - Residuals flat for 2D inviscid flow

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Old   May 20, 2019, 18:14
Default Convergence issues - Residuals flat for 2D inviscid flow
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Ryan
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Hi, I am very new to ansys fluent.


I believe I am having issues simulating 2D subsonic flow through a nozzle. My residuals plot for velocities and continuity does not seem to significantly decrease and remains constant (horizontal/flat). From what I have read, convergence of residual is satisfactory with a few orders of magnitude, which is not occurring here.

From various forums and google searches, I have found that convergence issues mainly arise from mesh quality, possibly incorrect boundary conditions, and schemes utilized. I have tried to refine my mesh near the nozzle wall and review my boundary conditions, but still have not had much success. I've attached a number of screen shots of my setup and results of running simulation.

Solver type - pressure based
velocity inlet w/ magnitude set, velocity outlet with magnitude set (negative number for flow leaving)


I'm kind of stuck on ideas on what to tweak or if there is something I'm missing, I can't seem to find it.


Appreciate any help or advice!
Attached Images
File Type: jpg Models2.JPG (88.1 KB, 5 views)
File Type: jpg Mesh2.JPG (70.6 KB, 2 views)
File Type: jpg ResPlot2.JPG (46.2 KB, 6 views)
File Type: jpg VelVecMag2.JPG (86.0 KB, 3 views)
File Type: jpg SolMethod2.JPG (42.7 KB, 5 views)
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boundary conditions, convergence issues, nozzleflow2d, residuals non convergence

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