[MBDyn-users] WG: contribution to "CART"-WindTurbine example model & inconsistency in AeroDyn-12.58 interface

Rix, Patrick Patrick.Rix at repower.de
Mon Aug 13 15:29:58 CEST 2012

Hi Pierangelo,
dear users !

After having successfully finished the structural benchmark of our rotor blade model comparing against SIMPACK and HAWC2, we now started continuing with the aerodynamic validation based on NREL's AeroDyn-12.58 library using the two-bladed "CART" wind turbine model from the MBDyn examples corner as starting point. We adapted the aerodynamic part of your model to using AeroDyn and made some first test-simulations as "warm-up" exercise to get used to AeroDyn and finally got reasonable results - but during the work also a BUG(?) in the AeroDyn interface showed up [..it's a suspicion, but we are pretty sure that there is some inconsistency in the interface as we have to put a negative(?!) wind speed in the AeroDyn input file to get matching results comparing to MBDyn's intrinsic aerodynamics and to other wind turbine codes such as Flex5. I strongly assume that it's simply a mis-orientation by 180° as not only the longitudinal wind speed has to be negative but also "left" and "right" side are reversed when using full field turbulent wind files.
 ==> Did you or any user make the same observation ? ].
Apart from this inconsistency there also came up a few more questions which I'd like to discuss in separate threads.

To get a better overview and not to get lost within the many reference frames inside the CART wind turbine model I made a hand-sketch (PDF) of the reference frames, which I wanted to contribute in the hope it might be useful to other users, too, when starting to investigate in the model. (see attached PDF files which are unfortunately too big for the mailing list).
Hoping that my little drawing passes approval, I wanted to propose to put it along with the code of example model as well as some links pointing to two NREL documents, which describe the structural and geometrical details of the real turbine (and which state e.g. that the turbine runs upwind with clockwise rotation, when looking downstream on the rotor).

CART - wind turbine DOCUMENTATION:

    K.A. Stol,  "Geometry and Structural Properties for the Controls Advanced Research Turbine (CART) from Model Tuning", 2003,  NREL

    Fingersh, L.J. & Johnson, K., "Controls Advanced Research Turbine (CART) Commissioning and Baseline Data Collection", 2002, NREL

Can you tell me a little bit about the development history of the AeroDyn-12.58 interface:

·         Was the AeroDyn-12.58 interface validated/compared (at least roughly) against any other wind turbine software (e.g. FAST, BLADED,..) ?

·         Was there a special reason to develop a 'rotor-only' interface and not to start from NREL's  "ADAMS_2_AeroDyn"-approach which also includes/accounts for the tower ?

·         Is there anyone aleady running AeroDyn-13 or interested in doing so ?

With kind regards

Patrick Rix
Loads & System Simulation

REpower Systems SE
Albert-Betz-Str. 1
D-24783 Osterrönfeld

Tel.: +49 - (0) - 4331 - 1313 - 9408
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e-mail: p.rix at repower.de<mailto:p.rix at repower.de>
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