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Sorting of Airfoil Points

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Vijay Anand
Vijay Anand on 24 Sep 2020
Commented: nyhuma on 28 Jul 2023
Dear All,
I face a strange problem in arranging the airfoil coordinates coming from a CAD program. Kindly find the attached excel file for the coordinates.
I have tried the usual angular sort with respect to the centroid of all the points, but it fails in certain region ( where the curve is concave in nature).
Kindly give your thought process to solve this ...
Thanks in Advance,
K Vijay Anand
  3 Comments
Vijay Anand
Vijay Anand on 24 Sep 2020
I have requirement to sort similar airfoil profiles exported from CAD Software. The 2nd set of coordinates are original.
First set is sorted manually with lot of pain... :)
nyhuma
nyhuma on 28 Jul 2023
i have a solution in python, opensource. youll need python 3.10. concave convex hull is the answer. and then you want to optimize the alpha parameter for minimal loss of accuracy
https://gitlab.uni-hannover.de/tfd_public/tools/NTRfC/-/blob/master/examples/read_profilepoints.ipynb

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