VSPAERO TE Detection Fail

[Christian Hauschel]

Hello

I have the problem that in panel mode, not the full TE is detected for the RHS of my symmetric wing. The LHS works. 

With VLM, the TE detection works and the hole wing is used for the calculation.

I tried multiple things, like running the wings isolated, reducing the tesselation, ... 
Did you observe a similar problem? What was the solution?

Thank you & best regards,

Christian

P.S: I do not want to necessarily share the .vsp3 file.

[Rob McDonald]

Can you create a more simple file that exhibits the same problem?

This is something that likely can only be debugged by me running a test file in a debugger.

Rob

[Christian Hauschel]

Attached a test file.

[Christian Hauschel]

VSP 3.50.4 and 3.48.0

[Christian Hauschel]

I changed the airfoil start and end points, from:

0.9999... 0.0000... 

to:
1.0 0.0

I guess now it works. Could this be a tolerance issue?

On Tuesday, 2 June 2026 at 11:02:26 UTC+2 Christian Hauschel wrote:

[Rob McDonald]

It is tolerance related, but not in an expected way.

For some reason, you have TE closure turned ON with a closure T/C of a very small value -- about 1e-6.

This doesn't show up in the GUI because that field doesn't report enough precision to show such a small value.  So it appears as 0.0000 there.

So, even though your TE is geometrically sharp, it is topologically blunt.

Somewhere along the line, the super tiny TE cap is detected as degenerate (zero area panels) and is removed.  When it does so, it appears that the W value of the now TE edge is left somewhat up to chance (when collapsing the nodes, it choses one V value or the other).  Instead of being 0.0, it is 0.002.  So, the wake is not detected.

Rob