Update: I get even better results that match experimental results even more when I let it run for a few thousand more iterations

Here's an in-depth CFD tutorial and analysis of a NASA Axisymmetric Subsonic Jet Validation Case. I create the geometry with the help of Solidworks and I use every part of ANSYS's Design Modeler, Mesher, Fluent and CFD-Post to analyze and visualize some of the data. This simulation using Fluent matches experimental data better than NASA's own code, but other considerations must be taken into account when doing other geometries because compressible flow adds much more complexities.

Link to NASA's Validation Case: https://turbmodels.larc.nasa.gov/jets...

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