topic Re: Boundary fill won't compute in Fusion Design, Validate & Document Forum

Boundary fill won't compute

Asesnic — Fri, 12 Jan 2018 01:07:14 GMT

I have a rather large and complex assembly, and I need to do some CFD analysis on it. As I've done plenty of times, I've constructed some offset planes and tried to use the boundary fill tool to create the 'negative' of the assembly, but the boundary fill doesn't compute. I'm guessing it has something to do with the number of bodies in the assembly, but I don't know for sure.

Re: Boundary fill won't compute

TrippyLighting — Fri, 12 Jan 2018 01:09:34 GMT

We don't either ... without any data.

Re: Boundary fill won't compute

Asesnic — Fri, 12 Jan 2018 01:12:54 GMT

Sorry, I'm pretty new here. What data do you need?

Re: Boundary fill won't compute

TrippyLighting — Fri, 12 Jan 2018 03:34:45 GMT

The assembly. How else would we be able to evaluate this ?

Re: Boundary fill won't compute

Asesnic — Fri, 12 Jan 2018 19:29:31 GMT

Apparently I can't upload .iges files, so here's a Google Drive link. Essentially what I'm trying to do is fill the space between the planes seen in this picture and create a cavity where the assembly was. The details of where these planes are isn't super important except for the central plane in the picture needs to cut the assembly in half along its vertical axis. I've also attached the error message I'm getting. I can select the assembly, but as soon as I select one plane, I get the error message shown. As far as I can tell, my assembly has bodies with clear overlap so I'm not sure how to interpret the error message. Here are the screenshots:

Re: Boundary fill won't compute

TrippyLighting — Fri, 12 Jan 2018 19:34:11 GMT

I might be able to look at the IGES model, but the design in native Fusison 360 format would certainly be much more helpful.

What I'd like to understand is what would you accomplish with filling the volume between the two planes minus all the volume taken up by the actual design ?

Are you trying to assess the overall volume of the design to assess displacement ?

Re: Boundary fill won't compute

Asesnic — Fri, 12 Jan 2018 19:44:35 GMT

Apparently Fusion360 doesn't yet support exporting assemblies to a .f3d file.

Don't know how familiar you are with Autodesk CFD, but essentially I need to make a negative of the design so as to define where the fluid can flow. I need to essentially create a box with a cutout of where the assembly is. This link does a good job of demonstrating how the actual geometry is reflected in the CFD geometry. So I'm using the planes to define the edges of the wind (water) tunnel. Hope that helps clear it up.

Re: Boundary fill won't compute

schneik-adsk — Fri, 12 Jan 2018 19:51:02 GMT

If this is imported geometry then you have access to a tool in fusion direct modeling tools made just for CFD simulation.

Under create at the bottom is a command called "create fluid volume."

Re: Boundary fill won't compute

TrippyLighting — Fri, 12 Jan 2018 19:55:29 GMT

Ha, I'd have never looked there! Thanks for the tip!

Re: Boundary fill won't compute

TrippyLighting — Fri, 12 Jan 2018 19:59:59 GMT

@Asesnic NO, I am not familiar with Autodesk CFD, but I am very familiar with Fusion 360, which absolutely supports sharing assemblies. While that likely is not needed for this project, for future reference, if you find your design in the data panel and right-click on it then select "Share public link" you can copy that link and share it in a post here.

That will allow us to download a complete assembly in .f3z format.

Re: Boundary fill won't compute

Asesnic — Fri, 12 Jan 2018 20:08:16 GMT

I'm seeing that tool when I make a new file, but I'm not seeing that option on any assemblies or individual components that existed previously. How do I make it work? I've verified that I'm in direct modeling mode.

Re: Boundary fill won't compute

Asesnic — Fri, 12 Jan 2018 20:09:18 GMT

I didn't know that existed. Thanks for the tip, I'll be sure to remember that for next time!