AD: Adding rtest for TailFin polar-based model #1659
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Feature or improvement description
Test the tailfin polar-based aerodynamic model documented here:
https://openfast.readthedocs.io/en/dev/source/user/aerodyn/theory_tailfin.html
Impacted areas of the software
AeroDyn / TailFin
Test results, if applicable
The test case is documented there:
https://github.com/OpenFAST/r-test/tree/f/tailfin/glue-codes/openfast/Tailfin_FreeYaw1DOF_PolarBased
The time integration of the system in OpenFAST and python provides consistent results, verifying that the implementation is (at least partially) correct. Below are comparison of the structural states, and of some of the outputs (angle of attack and relative velocity at the tailfin reference point):