I have a question related with the subroutine “attach” of the dynamic stall analysis included in Aerodyn (BEDDOES). I’ve been going throught the code, to actually understand what it does, and I’ve tried to relate it with the original model propossed by Beddoes and Leishman, see: (" A Semi-Empirical Model for Dynamic Stall", J.G. Leishman and T.S. Beddoes, Journal of the American Helicopter Society, Vol.34-3). The fact is that, of course, the subroutine is completelly consistent with the model, as expected. The only difference with the orginal model, is a function defined as SAT, which apparently reduces the pitch rate of the profile(alfa dot) by around 0.1 on every time step, and has a very strong impact on the final results. There is no comment about it in pierce’s thesis.
My question is: does anybody know exactly why is that function included on the code? and what is its purposse?
Thanks a lot.