[WIP] PGOMEGA Implementation

[TurboLdd]

Proposed Changes

Hi all, I have implemented the PGOmega S-A turbulence model(TM) which is proposed by Xiao He(2022). This TM enables us to get a more accurate prediction of stall margin which is very important in turbomachinery. This TM has been used in the simulations of ROTOR67, TUDarmstadt single stage compressor, and the validation work is shown in GPPS 2024 conference. I also added the option related in configuration file. The paper related is "He, X., Zhao, F., and Vahdati, M. (September 19, 2022). "A Turbo-Oriented Data-Driven Modification to the Spalart–Allmaras Turbulence Model."

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• [X] I am submitting my contribution to the develop branch.
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• [X] I have added a test case that demonstrates my contribution, if necessary.
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[joshkellyjak]

Do you have a testcase that demonstrates this implementation? Can you reproduce and compare to the validation plots published by Xiao He? I think you have shared some similar results with us before.