avrSWAP(79) is defaulted to 0 in the latest ROSCO versions

[ghuwart]

Hello everyone,

I recently upgraded my workflow and made some tests with the latest ROSCO versions (2.6.0 and 2.7.0). Note that I am using my own aero-hydro-servo-elastic tool which is not OPENFAST.

I am having trouble with the fact that avrSWAP(79), the request for loads is now set to zero by default in ReadSetParameters.f90:
avrSWAP(79) = 0.0 ! Request for loads: 0=none

It seems to be ignored in OPENFAST's ServoDyn v3.4.1:
!> * Record 79, the request for loads, is ignored; instead, the blade, hub, and yaw bearing loads are always passed to the DLL as if Record 79 was set to 4
But my code abides by the Bladed API (see Appendix A.1, note 18) and puts a lot of outputs to zero.

However I wish to have outputs such as avrSWAP(83), the nacelle nodding acceleration, that is also used for the floating feedback.

I can compile my own ROSCO with avrSWAP(79) not defaulted to zero but I was wondering if there is a reason for putting this value to zero in the first place? I fear that all the codes that are compliant with this point are affected by this initialization.

Thank you.

[dzalkind]

I think we ignore avrSWAP(79) because ServoDyn ignores that index and sends all the information over the avrSWAP. Nothing should change in ROSCO if avrSWAP(79) = 4. Since we're getting all the loads in ROSCO, perhaps it should be that way technically. I can include it in a future bug-fix PR.

[ghuwart]

Thank you for the quick reply. I think it is a good idea to either have avrSWAP(79) = 4 or no default value at all so that it does not interfere with the code calling ROSCO. This quick fix does the trick in my case and I guess it can help others with similar codes.