Changing Airfoil shape parameters

[Vivian Kaspar]

Hi OpenVSP Team,

I’m working on a parametric model variation pipeline using Python and the OpenVSP API. Everything works great so far -- most parameters like Span, Twist, and Dihedral are being modified correctly. However, I’m facing an issue where airfoil shape parameters like ThickChord, Camber, and CamberLoc are not visually updating, even though, the code sets their values using vsp.SetParmVal(). And I’m setting the cross-section type explicitly to vsp.FOUR_SERIES to ensure it’s editable. Despite all this, the wing shape stays the same--. I suspect that while parameters are technically changing, the section type might not be truly switching or updating the geometry.

Is there another step required to properly “activate” the new airfoil shape? And/Or Is setting the "Type" parameter sufficient to trigger a change to FOUR_SERIES?

Thank you guys in advance for any help.

Vivian 

[Rob McDonald]

The Parms of an airfoil or a cross section curve are buried in an extra layer.  To access these, you need to use some different API calls...

https://openvsp.org/api_docs/latest/group___x_sec.html#ga6f0c427e4aebaf33228afe8964d15043

Do you have your script spitting out any errors it comes across?  Do you have the ability to see the output console from this program?

I expect that you should have seen some errors from VSP's error stack stating that the Parms could not be found.

Rob

[deenri...@gmail.com]

For anyone following, here is a quick example I wrote using the python API

xsec1 = vsp.GetXSec(xsecsurf,0)

wid = vsp.GetXSecParm(xsec1, 'ThickChord')

vsp.SetParmVal(wid, wing.thickness_to_chord)

wid = vsp.GetXSecParm(xsec1, 'Camber')

vsp.SetParmVal(wid, wing.geometry.camber_coordinates)

wid = vsp.GetXSecParm(xsec, 'CamberLoc')

vsp.SetParmVal(wid, wing.geometry.camber_location)

[Omer Kandemir]

Hi Vivian,

I think you need to call "vsp.Update()" after changing XSecShape as follows:
            airfoil_vsp_types = [vsp.XS_SIX_SERIES]
            vsp.ChangeXSecShape(xsecsurf,i_segs,airfoil_vsp_types[0])
            vsp.ChangeXSecShape(xsecsurf,i_segs+1,airfoil_vsp_types[0])
            vsp.Update()

Best regards,

Ömer

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