Define Hub and Shroud for imported CAD file

Daniel DA · May 10, 2016, 06:38

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.

Daniel DA · May 10, 2016, 06:51

Here you can see a picture of the imported file.

Hamidzoka · May 10, 2016, 17:13

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

Daniel DA · May 11, 2016, 04:34

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.

Hamidzoka · May 11, 2016, 06:38

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.

Daniel DA · May 11, 2016, 06:52

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.

Hamidzoka · May 11, 2016, 07:05

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

regards

colinda1 · May 18, 2016, 09:03

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

May 10, 2016, 06:38	Define Hub and Shroud for imported CAD file	#1
Daniel DA New Member Join Date: Apr 2016 Posts: 13 Rep Power: 10	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.

May 11, 2016, 07:05		#7
Hamidzoka Senior Member Hamid Zoka Join Date: Nov 2009 Posts: 293 Rep Power: 19	This should be done in a 3D CAD modeler e.g. Catia, NX,... regards colinda1 likes this.

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May 10, 2016, 17:13		#3
Hamidzoka Senior Member Hamid Zoka Join Date: Nov 2009 Posts: 293 Rep Power: 19	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

May 11, 2016, 04:34		#4
Daniel DA New Member Join Date: Apr 2016 Posts: 13 Rep Power: 10	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.

May 11, 2016, 06:38		#5
Hamidzoka Senior Member Hamid Zoka Join Date: Nov 2009 Posts: 293 Rep Power: 19	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.

May 11, 2016, 06:52		#6
Daniel DA New Member Join Date: Apr 2016 Posts: 13 Rep Power: 10	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.

May 18, 2016, 09:03		#8
colinda1 Senior Member Colinda Join Date: May 2012 Location: Brussels Posts: 153 Rep Power: 14	Indeed it can be done in CAD or in NUMECA software, (IGG/AutoGrid5) whichever you prefer.