[WIP] Enable the hover simulation for the Actuator Disk with Variable Load

[EttoreSaetta]

Proposed Changes

Hello to everyone,
I would like to propose a slight change in the Actuator Disk with Variable Load function.

The change consists in re-writing the computation of the axial, radial and tangential force coefficients by developing the advance ratio term. In this way it is possible to eliminate the explicit dependence with the free-stream velocity.
Thanks to this change, it is possible to simulate the hover condition (free-stream velocity equal to zero) since we eliminated the free-stream velocity from the denominator.

In addition, we do not need the input of the advance ratio J, but the RPM of the propeller.

This is a draft PR since a validation is needed and will be provided soon.

Regards,
Ettore.
TAARG, University of Naples Federico II

Related Work

#1027

PR Checklist

• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with the '-Wall -Wextra -Wno-unused-parameter -Wno-empty-body' compiler flags, or simply --warnlevel=2 when using meson).
• My contribution is commented and consistent with SU2 style.
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp) , if necessary.

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