Define Hub and Shroud for imported CAD file
 

Hi NUMECA users,

i have a question concerning the definition of my Hub and Shroud curves. I prepared a CAD-file of an impeller and imported it to AutoGrid 5. But now i dont have exact Hub and Shroud curves to select. Can i somehow manage to define them with surfaces or do i have to make them visible in the CAD-Model?
Thanks for your answers.

Regards Daniel.

Here you can see a picture of the imported file.

You need to have hub and shroud curves the revolving of which makes hub and shroud surfaces respectively. regarding the blades it seems no problem.

regards

Did you mean i just have to select all curves the build the surface, for example for Shroud, and than link them all to Shroud?
Or do i need an extra curve?

Anyway thanks for the answer, i´m working on it.

It is simple. Let me explain it this way:
every revolved surface is constructed by revolving a curve. for example in a z r theta reference frame, if there is a revolved surface around z, there is a curve defined using z and r. you should find this curve.
one method is to intersect the revolved surface with a proper plane, e.g. ZR plane. do this for both hub and shroud surfaces.

Thanks a lot for you answer Hamizoka,
i got what you meant, but i have one last question:
Do you know if i can produce such a plan in CAD or should i do it in NUMECA?
Regards.

This should be done in a 3D CAD modeler e.g. Catia, NX,...

regards

Indeed it can be done in CAD or in NUMECA software, (IGG/AutoGrid5) whichever you prefer.