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-   -   How do I set a boundary at a hole inside the tube (http://www.cfd-online.com/Forums/fluent/104774-how-do-i-set-boundary-hole-inside-tube.html)

Theerawat July 16, 2012 03:22

How do I set a boundary at a hole inside the tube
 
1 Attachment(s)
Hi guys, My geometry is a tube with water inside and I want to feed air at the center of that tube by using a smaller tube which is inserted to the center of the bigger tube. So I built the hole through to the bigger piper. The problem is I cannot set the boundary at the outlet of the smaller tube where the air go out. So, What should I do to set up the boundary at inside tube (at the blue circle of the picture)

Attachment 14459

Thank you those who can help me:)

RodriguezFatz July 16, 2012 04:16

Which version of DM do You use? I think in version 14 this is - finally - pretty easy:
Create a cyllinder that cuts your large tube in such a way, that it produces exactly the boundary you want. Use "frozen body" for each body!
Then, use the boolean operation. Now, in "Operation" choose "Imprint Faces"
Target body is your main pipe, tool body is the small (new) cyllinder. Choose "no" in the last option to destroy the tool body.
Here we go!

Theerawat July 16, 2012 04:20

I use solid work to draw this geometry so do you know what should I do

Theerawat July 16, 2012 06:01

OK I try to do what you told me. Do the frozen body means "freeze". I choose freeze but cannot click on boolean. could you tell me more? And if I import the parasolid from solidwork, what should I do ?


Thank you very much

RodriguezFatz July 16, 2012 07:07

Quote:

Originally Posted by Theerawat (Post 371591)
OK I try to do what you told me. Do the frozen body means "freeze". I choose freeze but cannot click on boolean. could you tell me more? And if I import the parasolid from solidwork, what should I do ?


Thank you very much

Frozen, freeze... whatever ;) I have a different language file in DM...
I have no clue about solidwork.
In DM, if you create two bodies that intersect and are not frozen, they automaticaly merge to a single body. So in your case you don't want that, since you want to work with them (all that boolean operation stuff). If you create your cutting body, be sure you choose a frozen body.
After creating the body you must apply a boolean operation (create -> boolean). Then try the steps from my other post.


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