[easterbran]

Hello,

I am using AVL to compare lift coefficient calculations against a Vortex Lattice program I have written. The input AVL file is attached (you will need to change the file extension from .txt to .avl if you wish to run it).

I am looking to generate 10, equally-spaced, spanwise panels and 4, equally-spaced, chordwise panels. Spanwise looks good, however, when I follow the AVL documentation to produce this result, I get strange chordwise panel spacing (see pic below). As far as AVL lift calculations go, they are similar to what I predicted with my code, but AVL seems to be about 10% greater lift coefficients across the span.

https://imgur.com/a/HQCdfvJ

I defined Nchord as 4, with Cspace as 0 (which should correspond to uniform chordwise spacing).

Is there a way to get the chordwise panels to be "truly" uniform like the spanwise panels are? Or is this just an AVL thing that will not affect lift calculations?

[easterbran]

In case anyone ever comes across this post with the same question:

The purple lines represent the boundaries of the horse-shoe vortex structures, which are offset by the quarter-chord in each panel, hence the strange panel spacing. The image shown does actually use 5 equally spaced, span-wise panels and 4 equally spaced, chord-wise panels.