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-   -   [GAMBIT] Creating 3d Elbow geometries of different bend angles (http://www.cfd-online.com/Forums/ansys-meshing/92923-creating-3d-elbow-geometries-different-bend-angles.html)

shubham208011 September 29, 2011 06:48

Creating 3d Elbow geometries of different bend angles
 
Hi all,

I want to create a 3d elbow geometries of angle 90, 60, 45 in gambit 2.3.16. Please help me i doing this. I know it is pretty simple job but i am not able to do it.
It would be very nice if anyone can help me and guide the steps that should i follow to create it.

Thanks & Regards
Shubham Mishra

-mAx- September 29, 2011 06:56

*create first cylinder as volume
*create second cylinder as volume
*move (rotate) second cylinder with desired angle
*move (translate) second cylinder with desire vector
*unite both volumes (boolean operation)

http://my.fit.edu/itresources/manual...reate_cylinder
http://my.fit.edu/itresources/manual...mg0205.htm#492
http://my.fit.edu/itresources/manual...eom_volm_unite

shubham208011 September 29, 2011 07:24

1 Attachment(s)
Thanks for prompt reply
As suggested by you, i had already tried it but i am not able to get the smooth bend at the joining face. I also attach the picture of it. Kindly suggest some more steps for it..
Thanks in advance
Shubham

-mAx- September 29, 2011 07:28

can you sketch what you are expecting in this case (90)

shubham208011 September 29, 2011 07:29

ya its elbow with 90 degree bend angle

-mAx- September 29, 2011 07:41

ah ok, I missed "bend angle" :rolleyes:

Then you can use sweep function: draw the path for your geometry (chain of axis), create the source disk and sweep with edges

*create the source disk (cap cylinder)
*from its center (you need to create the center as vertice) sweep it with desire height (will be cylinder height)
*continue the path, by creating the arc (for example you can create 2 vertices, but there are other methods)
*finish the path by sweeping end's arc-vertice with desire cylinder height
*Once your path is generated you can sweep your disk with edge (maybe you need to merge the 3 edges)
http://my.fit.edu/itresources/manual...e_create_sweep
http://my.fit.edu/itresources/manual...dge_create_arc
http://my.fit.edu/itresources/manual...eom_volm_sweep

shubham208011 September 29, 2011 08:04

while sweeping it, an ACIS error 73006 message: The chain to be sweept is parallel to the path..:(

-mAx- September 29, 2011 08:06

what are you sweeping= vertice or surface?
post picture

shubham208011 September 29, 2011 08:11

1 Attachment(s)
Max find this picture

-mAx- September 29, 2011 08:14

sweep surface with edge
If it failed: split your path in 3 portions: line, bend, line and sweep surface 3 times: one time with first line, second time with bend and finally with second line

shubham208011 September 29, 2011 08:42

no surface created while sweeping through bend...:(

-mAx- September 29, 2011 08:52

ok then I understand sweeps along lines are ok.
Check your radius it seems to be quite small, that could be the reason

shubham208011 September 30, 2011 00:42

What radius are you talking about??
Bend radius or radius of cylinder?

shubham208011 September 30, 2011 00:46

What radius are you talking about?
Bend radius of radius of cylinder??

-mAx- September 30, 2011 00:49

bend radius

shubham208011 September 30, 2011 01:36

I has increase the bend radius but it gives me same error..:(

-mAx- September 30, 2011 02:19

1 Attachment(s)
*enable perpendicular option in sweep surface tool*Your bend radius has to be greater than cylinder radius else you have self-intersection problem
Attachment 9368


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