Missing Results When Using Control Surfaces in VSPAERO Panel Method

[Violet Philip]

Dear OpenVSP Community,

I’m currently working on aerodynamic analysis of a Boeing 777-200ER model using OpenVSP. My goal is to extract aerodynamic coefficients using the VSPAERO solver.

However, I’m experiencing the following issues, When I add control surfaces (like flaps) to the wing and run the solver using the Panel Method, the results are incomplete,,,, The L/D vs. Alpha graph is blank and No .polar file is generated. 

On the other hand, when I switch to the VLM method, I do get the L/D and other graphs, but still no .polar file is created.

I’ve checked the setup and ensured that the control surfaces are defined and deflected properly. I'm unsure whether this issue is due to configuration errors, control surface limitations in the panel method, or something else.

Please  help me, I have attached the vsp3 file and my settings 

[Rob McDonald]

Control surfaces do not work with VSPAERO in thick surface (Panel) mode at this time.

Rob

[Violet Philip]

Thanks for the response. But I still encounter another problem when I use VLM... when I switch to the VLM method with Run mode "steady" on, I do get the L/D and other graphs, but still no .polar file is created. Please am I missing something ?

Violet

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[Brandon Litherland]

The Polar file is produced with the stability type is set to "off".  I just tried it and no polar is produced for any stability type runs, which makes sense given that each run is a perturbation of the listed alpha, beta, Mach, etc.  What was interesting, however, is that at least for an Unnamed_DegenGeom.polar file, if you run stability "off" then run any type of stability mode, the Unnamed_DegenGeom.polar is erased...

[Amedeo FAlco]

Hi Philip, if you want you can use my executable written in MATLAB to analyze you AC. Let me know if works for you. :D

 TestImportAC.zip

1. Unzip the folder TestImportAC.
2. Double-click on importAC.exe.
3. Enter the following serial number: 8J5PZQ-FK39TM.
4. Wait for the necessary packages to download for the script to work.
5.  Adjust the aeroSettings.xml file to match the .vsp3 file located in the Hangar folder.
6. Once the aerodynamic analysis is complete, close all figures.
7. Check the Excel_Aerodynamics folder for a summary of the .load file and general information about your aircraft.

To view this discussion visit https://groups.google.com/d/msgid/openvsp/a653935a-80c6-4fac-a6b1-438240d75443n%40googlegroups.com.

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Ing.Falco

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[Violet Philip]

Thanks so much, let me check

Violet

To view this discussion visit https://groups.google.com/d/msgid/openvsp/CAFDwRpttPnqfYZ4qm8_qAf3KqMQsQCF_%2BK52%3DVjLcbC3RqOLoA%40mail.gmail.com.

[Violet Philip]

Hello Amedeo, unfortunately I'm not able to open the file due to Google's rules. Could you please help me with any file other than the previous one ?

Violet

[Amedeo FAlco]

Eventually try with this link https://mega.nz/file/HwJiEQrT#PSxjlHc4E9fKfaLr6JfvvgSDMUY4XlAH2_Dig32Ts2A to download the .zip file. Let me know :)

Ing.Falco

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[Violet Philip]

The file appears to be blank

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