VLM Solver Stuck on Wake Grid Merging with Control Surface

[Steven Zhu]

Hello,

I recently encountered an issue when running VLM on a wing with a control surface. The solver often gets stuck during the wake grid merging step and no solution is obtained. I have tried excluding all other components, but the problem persists. The geometry appears normal, so I am unsure how to resolve this.

I have uploaded the .vsp3 file for reference.

Thank you in advance for your help， Any suggestions or workarounds would be greatly appreciated

Best,

Steven

[Steven Zhu]

I was using openvsp 3.45.3, and I just tried in 3.45.4, the problem presists. 

Thank you in advance for help. 

[Rob McDonald]

Does it hang every time for you, or just some of the time?

It worked fine for me on my M1 Mac.  Are you on Windows?

You have more resolution (both spanwise and chordwise) than you probably need, but that shouldn't cause a hang.

Rob

[Steven Zhu]

Yes it hangs everytime on my windows 11 with this case, and almost everytime on a wing with a control surface. 

[Valentin Ouart]

I have exactly the same issue on Windows, but it works on my M1 Mac.

[Kilian]

I also encountered this problem multiple times now in 3.45.4 (Windows 10). All I can do to solve this problem is using backup files and deleting the "corrupted" one.

[Brandon Litherland]

Weird.  Reducing the num U and W down to 21 lets it run fine.

I tried again and got it working by only changing the section Num W to 61 instead of 62.  I'm guessing there's a weird intersection going on somewhere in the CS with the wing grid and it's having a fit.  Try playing around with your wing NumU, NumW, and clustering to see if that helps.