Error: note mesh may not be closed!

[Bo M]

Good afternoon,

I have a simple model with just a sectioned wing and v-tail. The VSPAero analysis runs but I get the error "note... mesh may not be closed!" in the viewer console. 

I used to also be able to open the viewer to see pressures etc., but now this button is greyed out. I am also getting a much lower CL than expected, might it have something to do with this error?

What may be causing this issue?

I've been struggling a while and tried the following solutions: make trailing edge sharp, add wingtip caps to wing and tail, add root caps to wing and tail. Still no luck.

[Bo M]

Correction, the viewer still opens. There are no abnormalities in lift distribution and pressure plot other than lift is much lower than expected.

[Rob McDonald]

If you do not have wingtips  on your mesh - how can it be closed?

I would not expect open wingtips to cause materially lower lift -- I have used that technique at times when my wingtip seemed to be causing problems.

Rob

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[Bo M]

Right, I realized that and added the wing caps, but it wasn't fixing the mesh error unfortunately. I'm not sure where else this could be arising from or how I can do a check to find the issue.

I appreciate the input.

[Rob McDonald]

If you can post the model, I may be able to find something.

Rob

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[Rob McDonald]

The tail root is certainly an ugly spot -- I would recommend adding a small pod and burying the vertical tail ends into the pod to help clean that area up.

That gave some obvious hot spots in the lift distribution in panel mode, but generally speaking, VLM and Panel seemed OK.

What CL are you expecting?  Why do you think the result you are getting does not match that?

When you put wings into OpenVSP, it is on a half-wing basis -- so some of the parameters may have an unexpected value.

Then, when you tell VSPAERO the Sref, you need to use a value consistent with your expectations.

Rob

On Tue, Jun 28, 2022 at 10:50 AM 'Bo M' via OpenVSP <ope...@googlegroups.com> wrote:

Here you go. It's a very simple model so hopefully it doesn't take up too much of your time. Maybe it's the behavior at the tail root?

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[Bo M]

Great advice, thanks Rob. I'll try closing out the ugly tail root spot like you said.

It looks like I missed some flight condition inputs for the aero analysis, so that's what caused my CL issue.

Thanks again.