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[ICEM] make tip gap surface, ICEM

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Old   July 2, 2014, 08:42
Default make tip gap surface, ICEM
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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
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Old   July 2, 2014, 10:19
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kad
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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.
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Old   July 3, 2014, 11:06
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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

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Originally Posted by kad View Post
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.
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