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Calculation of Cp with VAWTs when using LLFVW
Good evening,
I have limited experience in computational fluids so I may have misunderstood something. I am trying to model a H-type VAWT using the LLFVW method (at least I think that’s what I am using?). I was wondering how the Cp is calculated in this case as I could only find information about how it is calculated in the BEM case in the documentation.
Thank you for your answer,
Best regards,
Serge
Hi Serge,
the main difference between BEM and LLFVW is the way in which the wake induction is obtained. This is a critical aspect, with great effect on the produced power and thereby rotor Cp, as the induction is a measure for how much the freestream velocity is reduced within the rotor plane.
When using the LLFVW the induction in the rotor plane is obtained based on the induction caused by all combined free wake vortex elements.
In contrast, when using BEM, or the DMST method, the induction is evaluated based on the momentum blanace.
BR,
David
