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-   -   [ICEM] blocking splined curve pipe (http://www.cfd-online.com/Forums/ansys-meshing/111385-blocking-splined-curve-pipe.html)

 jyh3134 January 5, 2013 13:12

blocking splined curve pipe

1 Attachment(s)
Hi all

Recently I'm exercising ICEM Tutorial.
Suddenly, I'm interested in blocking strategy for splined curve(not bendng
pipe of 90 degree) pipe like a picture I added.

I have a no idea that sigle block is not appropriate to this problem.

I should split block, but I don't know how to split because this geometry seems to need a zigzag blocks(?)

help me ~

 Far January 6, 2013 01:36

No problem. You don't need the zigzag blocks.

But you must understand the basic working of ICEM. ICEM by default project the faces to the nearest surface (and you only do the vertex and edge association).

Your problem is both sides (360 I should say) are projecting to the one side of the pipe. So either make the more splits so that straight edges of blocking resemble the curved geometry or use the edge command (spline or linear) to make the edges conform to geometry. Got it?

Last but not the least : Make the four curves on the surface of pipe at interval of 0, 0.25, 0.50 amd 0.75 to control the blocking. But this is not necessary.

 jyh3134 January 6, 2013 05:27

Thanks Far!!

1 Attachment(s)
Oh, I've done it! thank you so much.
(make curves along geometry at 0,90,180,360 degree)

and I moved vortexes to projected points, it works!

Anyway, now.. how to export mesh file for Fluent?

because of VORFN, SOLID parts, I can't apply B.C to them.

also delete them.

if I remained them, I think they'll make error in Fluent.

What can i do?

 Far January 6, 2013 07:31

Also make one ogrid to improve the quality.

Go to output tab and do following steps

1. Right click on the premesh and select option unstructured mesh.

2. Select solver Ansys Fluent (1st tab)

3. Boundary conditions (2nd tab) on inlet, outlet and wall. Make sure you have defined the parts (surfaces) for them.

4. output mesh (last tab)

Before that you should move all points to new part (name is points or any thing else as you like) and all curves to new part and then apply boundary condition on surfaces as mentioned in step 2 above.

 jyh3134 January 6, 2013 09:58

Apply B.C to solid part

oh, I've done calculation. Thank you sosososo much~

SOLID part made a problem in setting B.C, but I could fix it
by setting the part for 'fluid' B.C

Regards&Thanks

 Far January 6, 2013 10:41

Are you interested in solid part ?

I guess you have chosen the default option for the blocking. Rename it to Fluid and don't specify boundary condition for it.

If there were any solid (which is not here) and you dont want to import it in the mesh then simply turn it off before making the unstructured mesh and export mesh.

 jyh3134 January 6, 2013 11:37

blocking in fluid part?

you sound like that it is allowed to create block in 'fluid part' which has body. right?

I used to do that, but.. most of you look like to work blocking with 'SOLID part'. so I did like them.

I'm confused. Which one is general?

 Far January 6, 2013 11:39

I always change it to Fluid, otherwise Fluent gives the warning (for nothing :D) .

Since you are working in CFD, so it is good idea to name it like Fluid, flow etc

 jyh3134 January 6, 2013 13:13

Oh I see... now I understand the basic idea of Hexa meshing.

Thank you very much :)

Regards

 Far January 6, 2013 13:43

Quote:
 Originally Posted by jyh3134 (Post 400338) Oh I see... now I understand the basic idea of Hexa meshing. Thank you very much :) Regards
dont forgot to add the o-grid :)

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