Results do not match with Matlab Tornado

[bharswami]

Attaching JSON files (template_singlewing.txt, template_state.txt, template.txt) and *.mat file (singlewing.zip) of the single-wing. Please verify if both results are the same - between MATLAB and pyTornado. I notice difference.

Numerical results in global forces/moments do not seem to match exactly.

singlewing.zip
template_singlewing.txt
template_state.txt
template.txt

See issue initially reported here: #14 (comment)

[bharswami]

With regard to different VLM methods, which is most accurate? I notice large difference between free stream following wake and fixed wake methods in Matlab Tornado itself.
Matlab Tornado has option to do both.

[aarondettmann]

Well, it's all one method (the VLM). The difference simply lies in how the wing and the wake are modelled using vortex elements, i.e. different levels of "geometric" approximations. I am aware of three ways to define the vortex elements, but I am not aware of any literature that discusses these different approximations systematically. But it sounds a bit concerning if there are large differences between the different discretizations.

[bharswami]

When you try out freestream-wake versus fixed wake, please be sure to compare the moment values.

…

On Sat, Jan 18, 2020 at 8:18 PM Aaron Dettmann ***@***.***> wrote: Well, it's all one method (the VLM). The difference simply lies in how the wing and the wake are modelled using vortex elements, i.e. different levels of "geometric" approximations. I am aware of three ways <#14 (comment)> to define the vortex elements, but I am not aware of any literature that discusses these different approximations systematically. But it sounds a bit concerning if there are *large differences* between the different discretizations. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#18?email_source=notifications&email_token=AHHO5AJDRLEQ3UY6CWFXQ2TQ6MJDVA5CNFSM4KIRLZ32YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEJJZ36A#issuecomment-575905272>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHHO5APYF6OZYMEDLCBSVC3Q6MJDVANCNFSM4KIRLZ3Q> .