Canard and Wing Combo

[Isaac Kocherla]

Hello,

I am trying to analyze Canard and Wing configuration. I am able to create the Canard and Wing combination. I am looking for ways to calculate the Cl value for Canard and Cl value for Wing separately, instead of a total. Is there a way to do this in OpenVSP. If you can point me to any discussion that has already took care of it, do let me know.

Thanks,

Isaac

[Brandon Litherland]

You're looking for the *.LOD file.  At the bottom of the spanwise breakdown is the integrated contributions of the forces and moments, including CL for each side of the symmetric wing.  VSP treats symmetric wings as two surfaces so 1 and 2 will be one whole wing and 3 and 4 will be the other as in the example below.

Comp      Component-Name                             Mach       AoA      Beta       CL        CDi       CS       CFx       CFy       CFz       Cmx       Cmy       Cmz 

1         Canard                                     0.00100   0.00000   0.00000   0.03391   0.00069  -0.00032   0.00033  -0.00032   0.03391   0.09158  -0.02805  -0.00110 

2         Canard                                     0.00100   0.00000   0.00000   0.03391   0.00069   0.00032   0.00033   0.00032   0.03391  -0.09158  -0.02805   0.00110 

3         Wing                                       0.00100   0.00000   0.00000   0.27201   0.00293  -0.00240   0.00203  -0.00240   0.27201   2.49933  -3.29516  -0.03828 

4         Wing                                       0.00100   0.00000   0.00000   0.27204   0.00293   0.00240   0.00203   0.00240   0.27204  -2.49949  -3.29546   0.03828 

[Isaac Kocherla]

Hi,

Thank you so much for the response. I am unable to find it in my .LOD File, it's just blank

Should I turn on any parameter?

[Isaac Kocherla]

I have included the .lod files in this message

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[jvgr...@gmail.com]

An empty *.lod file may indicate something is wrong with your geometry that caused VSPAERO to crash. Are the other VSPAERO files like the *.history empty also? If so, we'll need to assess what may be wrong with your model. There are a handful of common pitfalls that have been discussed on the Google group and Wiki. If you're unable to identify what the issue with your geometry is, feel free to post the *.vsp3 file here for someone to look at. Note that the current versions of VSPAERO does not support load distribution results for Panel method, only VLM.

-Justin 

[Isaac Kocherla]

Yup, got it. Finally realized I was looking in the wrong file. It should *_DegenGeom.lod file, it has all the info

[Isaac Kocherla]

Which version, supports for Panel method or it doesn't matter?

[jvgr...@gmail.com]

No version of OpenVSP currently supports *.lod results for Panel Method analysis. We expect load distribution results for VLM and Panel will both be supported soon though. 

-Justin