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Hi Antonios,

 

Breps are basically a set of trimmed surfaces that are stitched together. These cannot easily be transformed to nurbssurfaces.

Think of a surface with some holes - there is typically not a single nurbs representation for this type of geometry.

 

Cheers,

Stefan

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Hi,

 

I would like to expand on this question. I am trying to do a propeller analysis and I have a single nurbs solid of the blade geometry splitted through the leading edge of the blade. (exported as IGES from AutoDESK inventor platform)

If I understood correctly, the tutorial video showed that we have to import two surfaces, front and back (i.e. low pressure, high pressure respectively). Well my problem is that when I try to convert the splitted parts to nurbs surfaces it only creates a joined single surface of the blade, meaning that I am losing the splitting information. Just out of curiosity I went ahead and tried to do a blade analysis with what I have but to no success.

 

My question is: Is there a way to split a single nurbs surface into two inside the CAESES? Or do I have to use another platform other than the Inventor to export my blade geometry?

 

Thanks in advance.

 

Orçun 

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Hi Orçun,

 

You can extract the NURBS information, see the attached picture post-8-0-50499100-1516788866_thumb.png. If your underlying surfaces are somehow identical to the actual blade (and not strongly trimmed etc), you can then use e.g. image surfaces (change domain intervals) to separate them in CAESES.

 

Cheers

Joerg

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