[Jonathan]

Hi all,

I was wondering if any of the ICEM guru's could help me with some geometry i need to make for a gas turbine tip ...

I was modelling my blades using a blade-in-the-middle flow volume configuration, but for various reasons, have needed to change to a blade-to-blade flow volume configuration.

I need now to build surfaces which cut the blade tip near the centre of the tip surface on each blade so i can make the periodic (cyclic) boundaries.

The issue is, i have is that i need to project the tip chord line onto the tip surface, however, the projection vector is not able to be specified using just x1 curve - you will see it is a complex 3d shape.

I dont know if anyone knows any other approaches which might work, but projecting down onto the tip surface, creating a line, and splitting the surface was the process i thought would work.

could anyone who has any other ideas, or tricks i could use in ICEM help me out? I am at a dead end and would appreciate.

thanks very much + best regards
Jonathan

[kad]

Did you try the projection method "normal to surface" when projecting the green curve? Another approach is creating a midline from the upper and lower profile curves at the wing tip. Therefore you might have to group/merge the curves first.

In general geometry modification is much easier in CAD Software than in ICEM. Maybe this is also an option to think about.

[Jonathan]

Dear kad,

thank you very much - that is great. both approaches work pretty well for what i want - i just need to change the way i am building things and then either approach should provide the solution. i guess i am just not familiar with all the functionality available in ICEM.

thanks very much.

re: CAD - yes, i guess you are right here too, although my geometry setup is all automatic (i.e. parameterised) so i chose to do it in ICEM because of the scripting functionality.

again, thanks very much for your help,
cheers
jon

Originally Posted by kad

Did you try the projection method "normal to surface" when projecting the green curve? Another approach is creating a midline from the upper and lower profile curves at the wing tip. Therefore you might have to group/merge the curves first.

In general geometry modification is much easier in CAD Software than in ICEM. Maybe this is also an option to think about.