VSPAero QNAN Problem

[Nicolas Gonthier]

Hello people,

I have some problems with VSPAero when I try to run the solver on my plane (a fuselage plus a wing), it always stop operating.

The error is :

Loop: 24828 on body surface: 6 has zero diagonal... Mach is: 0.200000 
Wake Iteration:     1 ... GMRES Iteration:     0 ... Reduction:    1.#QNAN ...  Maximum:    1.#QNAN

What can I do to settle this problem ?

All the best,

Nicolas  

[Rob McDonald]

Maybe Dave has some ideas.

In the meantime, can you provide more information? Did you start with
a simple example and work towards more complex? Did a simple example
work?

Is there anything unusual about your model or the geometry?

Rob

> --
> You received this message because you are subscribed to the Google Groups
> "OpenVSP" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to openvsp+u...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.

[Nicolas Gonthier]

I find that the problem is about the fuselage, and the fact that I have rounded rectangle section. 

Without this section I don't have any problem with VSPAero.

I join the XML file.

Thanks

Nicolas

[Rob McDonald]

On Fri, Jun 5, 2015 at 2:10 AM, Nicolas Gonthier <nica...@gmail.com> wrote:
> I find that the problem is about the fuselage, and the fact that I have
> rounded rectangle section.
> Without this section I don't have any problem with VSPAero.

I understand how rounded rectangles could cause a problem -- I'll talk
with Dave and see if we can come up with a fix.

In the meantime, just switch those sections to ellipses. That will
actually do a better job of representing what you want to VSPAERO.
Since it is a thin surface code, the geometry comes through as smashed
down sections. In that case, the ellipse is the exact same thing.

Rob

[Nicolas Gonthier]

Yes, you are right. I will do use VSPAero with ellipse instead of  rounded rectangle.

[B-ROB]

Yes I noticed the exact same problem.  I took the "transport.vsp" file from the VSP hangar and tried to run...same issue.  Won't work.

[Rob McDonald]

Brent,

Were you trying to model the Transport with all the components -- when
I tried it in VSPAERO, I believe I used Sets to not pass the nacelles
and pylons to VSPAERO. You might try that to see if it helps you make
some progress.

Rob

[Rob McDonald]

Most importantly, the nacelles and the puck component held inside them
-- that component really doesn't make sense for VSPAERO. They will
cause problems when converted to a DegenGeom.

Rob

[Brent Robbins]

Rob,

I "cut" everything out except "Fuselage", "HTail", "VTail", "GearPod" & "Wing".  vspaero.exe stopped working.  You got it to work?
 

---

From: Rob McDonald <rob.a.m...@gmail.com>
To: ope...@googlegroups.com
Sent: Wednesday, June 10, 2015 7:28 PM
Subject: Re: [OpenVSP] VSPAero QNAN Problem

>> email to openvsp+unsub...@googlegroups.com.

>> For more options, visit https://groups.google.com/d/optout.

--
You received this message because you are subscribed to the Google Groups "OpenVSP" group.

To unsubscribe from this group and stop receiving emails from it, send an email to openvsp+unsub...@googlegroups.com.