Aviary Tabular Aerodynamics Subsystem

[mizu0fire0]

Hello ,
I am facing a couple of issues with the implementation of a tabular aerodynamics subsystem into my Level 2 aviary code . and would like to know if there is an example of implementation .

[Kenneth-T-Moore]

Hey, mizu. I was hoping we had an example in the aviary documentation for it, but I didn't see one. There is a unit test though, which should be helpful. Note, that this is for the format that FLOPS uses, and gives lift dependent and lift independent drag.

Aviary/aviary/subsystems/aerodynamics/flops_based/test/test_tabular_aero_group.py

Line 48 in d5cc824

self.prob.model.add_subsystem(

For a more traditional polar that gives lift and drag as functions of mach, altitude, and angle of attack, you should used the "solved_alpha" method:

Aviary/aviary/subsystems/aerodynamics/flops_based/test/test_solved_aero_group.py

Line 86 in d5cc824

subsystem_options = {'method': 'solved_alpha',

Here, angle of attack will be computed by a solver so that the interpolated lift equals the weight at each point in the trajectory.

Some general explanation is given here, though it is light on examples:

https://openmdao.github.io/Aviary/user_guide/aerodynamics.html

[mizu0fire0]

Thank you for the guidance @Kenneth-T-Moore , unfortunately some errors arise from the suggested implementation :

there is no documentation linked to these variables since they havent been defined in our Level 2 code.

[Kenneth-T-Moore]

Hey, mizu. Sorry for the late reply. Can you attach a model (csv file + run script) that shows this problem? These can be a little challenging to debug, though there is something familiar about this error...

[jkirk5]

Also which version of Aviary are you using? Some of these errors might have been recently resolved or there are solutions currently waiting to get added, I remember fixing up some issues with mismatched shapes recently.

[mizu0fire0]

hello @Kenneth-T-Moore , really sorry for the late reply so I am using aviary 0.9.8 to run my model , with the aerodynamics ,engine and propeller maps imported .
model.zip