#217 Strange behavior for symmetrical setup

[Paul Bizard]

For a plane with a symmetrical airfoil and 0° incidence for both the wing and the stabilizer, and whose stabilizer is inline with its wing (z stab = 0) (e.g. F3A), the results are non-physical. Numerical issue?
File created with XLFR5 6.62

[André]

The plane must be constructed so that the trailing vortices or wake panels shed by the upstream wing do not interfere with the downstream panels.
André

[Paul Bizard]

T‌hank you for your answer André,

But it is purely numerical isn't it ?

Regards,
Paul

De : "André"
A : "[xflr5:tickets] " 217@tickets.xflr5.p.re.sourceforge.net
Envoyé: dimanche 10 Mai 2026 01:49
Objet : Re: [xflr5:tickets] #217 Strange behavior for symmetrical setup

The plane must be constructed so that the trailing vortices or wake panels shed by the upstream wing do not interfere with the downstream panels.
André

[tickets:#217] Strange behavior for symmetrical setup

Status: open
Milestone: 1.0
Created: Sat May 09, 2026 06:43 AM UTC by Paul Bizard
Last Updated: Sat May 09, 2026 06:43 AM UTC
Owner: nobody
Attachments:

Symmetrical airplane.xfl (sourceforge.net) (7.5 MB; application/octet-stream)

For a plane with a symmetrical airfoil and 0° incidence for both the wing and the stabilizer, and whose stabilizer is inline with its wing (z stab = 0) (e.g. F3A), the results are non-physical. Numerical issue?
File created with XLFR5 6.62

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[André]

It is a numerical effect.