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-   -   [ICEM] Y-block on curved surfaces (https://www.cfd-online.com/Forums/ansys-meshing/92569-y-block-curved-surfaces.html)

 Ralen September 19, 2011 02:18

Y-block on curved surfaces

4 Attachment(s)
Hi All.
How do I build the same Y-blocks as shown in the ICEM help?
ICEM Project http://www.sendspace.com/file/ygl9nw

 BrolY September 19, 2011 08:18

Blocking -> Create Block -> From Vertices/faces

Select 3D as Dimension, Hexa as Block Type and then Quarter O-Grid

Have fun ;)

 Ralen September 20, 2011 03:45

2 Attachment(s)
Quote:
 Originally Posted by BrolY (Post 324666) Blocking -> Create Block -> From Vertices/faces Select 3D as Dimension, Hexa as Block Type and then Quarter O-Grid Have fun ;)
Here's how it happened to one corner. Somewhere there was another grid.

 BrolY September 20, 2011 05:41

Before creating the Y block, you have to delete the previous one !

Another tip, once you have created your Y block, always go to Blocking -> Check Blocks -> Fix Inverted Block. Otherwise, you would have negative determinants.

 Ralen September 20, 2011 07:05

1 Attachment(s)
Quote:
 Originally Posted by BrolY (Post 324818) Before creating the Y block, you have to delete the previous one ! Another tip, once you have created your Y block, always go to Blocking -> Check Blocks -> Fix Inverted Block. Otherwise, you would have negative determinants.
I remove all the blocks, creating a 3d box for all the geometry and divide it into 4 equal square blocks. I did not remove the block and create Quarter O-Grid on it, because I need / \ (upside down Y as in the image below), but not \ / (Y). Accordingly, I need external vertex, rather than internal.

 BrolY September 20, 2011 07:35

You have to remove that block and use the vertices of the remaining blocks to create your 1/4 O-grid.

Post the geometry here, I will have a look and show you the steps to create that Y block ;)

 Ralen September 20, 2011 07:45

1 Attachment(s)
Geometry http://www.sendspace.com/file/3zmvok. ICEM Project is attached in the first post. I'm here about that if I remove the block, then lost two vertices at the corner. In total, four such blocks need to curved surfaces, and four for the vertical plane.

 BrolY September 20, 2011 08:56

I can't open solidwork file with my ICEM.
So please send a .stl file ;)

Here is another tip :

1) show the VORFN part, and add the 3 blocks around the one where you want to create your Y block to your fluid part
2) delete the block where you want to create the Y block
4) delete the 3 blocks
5) fix inverted block

It should work ;)

 Ralen September 20, 2011 10:28

1 Attachment(s)
STL file. This is part of the diffuser as shown in the first message. I'm just trying to build a grid separately.

 PSYMN September 20, 2011 13:14

I think the problem in the image that showed overlapping mesh was actually the lower surface projected edges projecting to the top surfaces instead of the lower surfaces... Run a cut plane thru the other direction to be sure...

 BrolY September 21, 2011 03:54

3 Attachment(s)
Ok here we go:

1) Create the 2 cuts as you did before
2) Create an o-grid for all of them
3) Add another split in the o-grid
Your blocking should be like the one at the picture 1

4) Merge the vertices 1 with 2 and 3 with 4 (cf. picture 2)
5) Associate curves with edges

 Ralen September 21, 2011 04:35

Quote:
 Originally Posted by BrolY (Post 324999) Ok here we go: 1) Create the 2 cuts as you did before 2) Create an o-grid for all of them 3) Add another split in the o-grid Your blocking should be like the one at the picture 1 4) Merge the vertices 1 with 2 and 3 with 4 (cf. picture 2) 5) Associate curves with edges
And what this mesh is different from mine, shown in the first post? :) Do not solve the main problem: the sharp angles of triangular surface mesh is bad.

 BrolY September 21, 2011 04:44

oh, you want to improve the quality of your mesh ??
In your 1st post, you asked how to create the same mesh than the one shown in the pictures ...
So, I guess you try to improve this mesh by creating a Y block ?

 Ralen September 21, 2011 06:26

Quote:
 Originally Posted by BrolY (Post 325011) oh, you want to improve the quality of your mesh ?? In your 1st post, you asked how to create the same mesh than the one shown in the pictures ... So, I guess you try to improve this mesh by creating a Y block ?
Sorry. In the first post four pictures: the first three of them made by me, and the last of the ICEM CFD HELP. I want to get a mesh like the last picture. But in my case I need to do 8 Y-blocks.

 Far April 4, 2012 05:05

I know this is the solved problem, but it may help others who have similar problem. That is how to create Quarter O-grid for wedge block with single click

 PSYMN September 20, 2012 17:48

Thanks for taking the time to make this helpful video.

If you (or anyone else) would like to share your demo vids with a larger audience, please email your youtu.be link to "social@ansys.com" and tell them they are welcome to post it in the user generated content favorites list of the ANSYS TechTips YouTube channel. The URL for this channel is http://www.youtube.com/ANSYSTechTips. If it is a technical demo, ask them to put it under tech tips. ANSYS can hit the "like" button and add it to their favorites so it shows up on the ANSYS channel. Of course, there is no guarantee they will like your video ;^).

One other thing, please make sure that the description of your video clearly states what the demo shows so that people can find the right ones...

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