FLOPS based premission for BWB

[xjjiang]

Summary

This PR adds a unit test for FLOPS based subsystems with BWB configuration (see BWBPreMissionGroupTest class in test_flops_based_premission.py). This PR assumes that geometry and mass subsystems are already implemented using BWB using FLOPS code. Since there is no specific code in FLOPS for BWB, this unit test covers all four basic subsystems: propulsion, geometry, aerodynamics and mass.

As in PR #889 for mass subsystem, we prepare two cases for the testing: Case 1 with simple fuselage layout and simple wing layout (see bwb_simple_FLOPS_data.py) and case 2 with detailed fuselage layout and detailed wing layout (see bwb_detailed_FLOPS_data.py) in aircraft model directory.

Almost all results match with FLOPS outputs. But the computation algorithm of bending material factor is a little bit different in the second case. As a result, wing mass and structure mass are a little different too. The comparison is as follows:

Aviary Variable Name	Value	FLOPS Variable Name	Value
Aircraft.Wing.BENDING_MATERIAL_FACTOR	3.93743732	BT	3.972479625
Aircraft.Wing.MASS	68922.20579045	WWING	68995.460470895763
Aircraft.Design.STRUCTURE_MASS	240915.88664709	WSTRCT	240989.14132753

CSV data input based unit tests are added. This is the first time that we use CSV input deck for premission unit test in test_flops_based_premission.py.

Related Issues

• Resolves #

Backwards incompatibilities

None

New Dependencies

None

[xjjiang]

@xjjiang which specific tests were breaking without making the engine variables into vectors in the input file? I can fix them so that isn't required

Don't worry about it. It happens only when I test mass subsystem by itself. Now, I tested all subsystems all together and it is not a problem anymore. Also, I added a unit test using CSV file. By this approach, I am able to test mass subsystem by itself (actually geom+mass).