Thanks Rob, I'm starting to go through the Fluent courses on the ANSYS Learning Hub, so give me a few months to get past the novice level. I will check out the new Fluent Meshing workflow soon. Ah, yes, oscillations in the flow, that makes sense.
Inlet is 0 Pressure, Outlet is the brown semicircle at -1000 Pa of Pressure.
What I found amazing on the previous model with the good mesh quality is that when I first ran the calculation, it settled on a solution where the flow was going in the opposite direction and was blowing into the nozzle from the outlet. I fixed that by Patching the inside domain with a +Z velocity.
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