[WIP] airfoil workbench

[looo]

As I already mentioned somewhere else, I am currently working on an airfoil workbench. I will posts updates in this topic. The work has 3 targets:
1. calibrating/modifying spline-foils to foils given by coordinates
2. optimizing spline foils (reducing drag with libxfoil)
3. interpolation of drag-computation with neural networks (not yet sure if this is a good idea)


1.
The current functionality is mainly the calibration and interactive modification of spline foils (I called them parafoil's -> parametric foils). This tool helps to create good approximations of airfoil coordinates by using a calibration method (least-square method from scipy). I decided to fix the number of poles of a parafoil. This makes the calibration task easier and also will help later on with the wing creation.

phpBB [video]

added nose-tangent and table to modify pole-coordinates and weights:

Peek 2019-12-13 20-31.gif (601.66 KiB) Viewed 4766 times

[Joel_graff]

I'd like to include this as a new WB in the 0.19 release notes. Can you post a good description and maybe a nice screenshot either here or in the release notes thread?

[chrisb]

The release notes thread was rather hard to find. Should it be pinned or moved to Announcments or both?

[Kunda1]

Should it be pinned or moved to Announcments or both?

[chrisb]

Is this thumb up for pin or move or both ?

[Kunda1]

Is this thumb up for pin or move or both ?

lol, my vote is to pin it

[looo]

I'd like to include this as a new WB in the 0.19 release notes. Can you post a good description and maybe a nice screenshot either here or in the release notes thread?

I would like to make some progress first, as currently, not much functionality is provided.

[chrisb]

lol, my vote is to pin it

I pinned it, we can easily return to the current state by unpinning.

[looo]

I need a solution for finding the leading-edge of an foil given by coordinates. Currently I am using the point with the smallest x-value as the leading-edge. But this is not coorect. I guess a better definition of the leading edge is the intersection of the camber-curve and the airfoil. But I am not sure how to compute this point. Maybe someone has an idea.

leading-edge.png (8.31 KiB) Viewed 4904 times

[microelly2]

What is the definition of the leading edge? I think, I have a feeling,but it is better to have a well defined concept.