Conformal issue with fuselage

[Mike Vivaldi]

Good Morning,

I've run into an issue with generating a conformal volume in 3.51.1. As shown below. Are there any ideas as to what might be causing this?

Kind Regards,

Mike

[Mike Vivaldi]

[Mike Vivaldi]

My Apologies for the multiple messages, google kept notifying that "message too long" when all the above parts were incorporated into one message.

-Mike

[Rob McDonald]

Did this file work with a previous version?  If so, what is the last version known to work?

Rob

[Rob McDonald]

What are you doing to create this file?

It ends up as an 11.8MB file -- where almost all of that is declarations of an inlet/outlet flow subsurface for a WaveDrag calculation.  Literally 460,000+ lines of this crap.

When VSP reads that file in, it triggers an O(n^2) algorithm, where n is that number of lines divided by 3 -- so n=155,520 -- which is effectively an infinite loop.

However you created this file is a huge problem -- either in your process, or a bug in OpenVSP.  Please let me know what you're doing to make this mess.

Now for the reason that XSec is squished....

That cross section is built with an 'Edit_Curve' XSec -- by moving Bezier control points directly.  However, its Width is set to 0.02892 (and height 2.633).

This happened because you turned on the 'View Abs' button on just that XSec.  That means that you're editing the control points in absolute coordinates -- but they are stored with X/W relative to the width.

When the conformal section is calculated, it is done in the non-dimensional frame, and having a nearly zero W is messing things up.

So, you need to turn off 'View Abs' on that section.  Then set the Width to a reasonable value, then, go through and scale all of the X coords of those control points down by the ratio you changed W.

Rob

[Mike Vivaldi]

Hi Rob, 

Thanks for the info, that did fix it. I have no idea what happened with the file and how all the inlet and wave drag stuff got in there. The file is a copy of the entire aircraft with the other parts deleted. I created the fuselage by importing a point cloud and using the best fit method for the shape. Is there a way to delete the extraneous data? The huge data set would explain why the file takes so long to load.

Kind Regards,

Mike

[Rob McDonald]

I was able to delete the lines in a text editor.

Rob