Implement aerodynamic model of rotating pair of wings

[ufechner7]

Implement a pair of rotating wings for the concept explained here: https://www.tiira.ch/

While the current model can model rigid wings well, also multiple wings, it does not take into account that one wing is flying in the wake of the other wing while rotating.

[ufechner7]

It would be very interesting to make some assumptions about the way the trailing vortices are being shed and transported and then see if the choice of that assumption has such a big impact on the result. One might e.g. record the horizontal and vertical force produced by the two blades over one revolution and then use a momentum consideration for the whole swept volume of air to calculate the direction in which the trailing vortex spirals are being transported. In any case, for any AWE system with small flight patterns, there will be no "instantaneous" method where the circulation distribution can be calculated just from the current relative inflow and turn rates.

[1-Bart-1]

I think the wake vortexes currently move in a straight line straight downwind, and the current model is "instantanious", it doesn't take the wake from previous points in time into account. @jellepoland how difficult would it be to change these things?

[jellepoland]

One could update the wake model to something called:
"Lifting Line Free Vortex Wake Method".

Used and documented in OpenFAST and in QBlade .

A contact person could maybe be: 'Andre Pinto Ribeiro' to ask for advice.

[ufechner7]

Good paper: Preliminary Introduction of a Free Vortex Wake
Method Into OpenFAST