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IEAWindTask37 / IEA-15-240-RWT

15MW reference wind turbine repository developed in conjunction with IEA Wind
Apache License 2.0
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airfoil interpolation in IEA-15-240-RWT_AFxx_Coords #114

Closed MassimoSirigu closed 1 year ago

MassimoSirigu commented 1 year ago

Hello, I would like to know how the coordinates of the airfoils that I find in IEA-15-240-RWT_AFxx_Coords are interpolated. In Matlab, I took the standard airfoil contained in the YAML file (the files FFA-W3-360 and so on) and tried to interpolate to find the correspondence between my foil and the foils in IEA-15-240-RWT_AFxx_Coords. it seems that the relative thickness changes between my file and yours. I found that the relative thickness is present in the YAML file together with the coordinates of the standard foil. So I want to ask you: is there the relative thickness in the function of the blade length in the ontology file? and second question: the linear interpolation is good? or do I have to interpolate with another function? thank you for your time image image image

ptrbortolotti commented 1 year ago

Hello Massimo, my apologies for the slow reply. I might be missing something, but I feel like there is something wrong with your coordinates. At blade tip (radius 100%), the blade of the IEA15 uses the profile FFA-W3-211, which is 21.1% thick. Your plot shows an airfoil that is almost 40% thick. The airfoil positions along blade span are specified here https://github.com/IEAWindTask37/IEA-15-240-RWT/blob/3a00f7f38a6373f6b026aef5878b671ca7af3605/WT_Ontology/IEA-15-240-RWT.yaml#L15 Please let us know if this helps. Best regards, Pietro

MassimoSirigu commented 1 year ago

Hello, sorry for the late response. The problem was that the airfoils in the YAML file were not sorted in the order of the blade length, and it confused me. However, I solved it weeks ago.