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-   -   [ICEM] connected mesh in blocks joint (http://www.cfd-online.com/Forums/ansys-meshing/70606-connected-mesh-blocks-joint.html)

gajemon November 30, 2009 08:51

connected mesh in blocks joint
 
2 Attachment(s)
Hello all!
I have a problem with meshig of blocks joint. Can anybody help me?
How can I get connected mesh in this blocks joint?

Thanks in advance

PSYMN December 13, 2009 00:01

Merge Vertex pairs between the faces.
 
The large block has 4 faces. The small pipe looks to have 1 face (is there an Ogrid in it, if so, we will need to adjust these instructions.

I am guessing that you did this blocking separately, then loaded the two at the same time and combined the topologies?

The only step that remains is to merge the verticies. Often merging the topology will take care of that for you, but not if they were further apart than the tolerance.

If you merge the 4 pairs of verts between two faces (the merged topology must match (face to face or OGrid (5 faces) to OGrid), then the faces will become one and the mesh will be connected.

Warning, because you combined 2 blockings, each with its own indecies, you should expect that to get a bit messy after the merge.

If you don't think this is the problem, post another pic of the contact area with the vertex numbers displayed.

Best regards,

Simon

gajemon December 14, 2009 06:59

5 Attachment(s)
Quote:

Originally Posted by PSYMN (Post 239833)
The large block has 4 faces. The small pipe looks to have 1 face (is there an Ogrid in it, if so, we will need to adjust these instructions.

There is no Ogrid in small pipe yet)

Quote:

Originally Posted by PSYMN (Post 239833)
I am guessing that you did this blocking separately, then loaded the two at the same time and combined the topologies?

First, I did two large blocks (pic.1), then pipe blocks with 'Extrude face along curve' (pic.2). Up to merge verticies there was like on the pic.3

Quote:

Originally Posted by PSYMN (Post 239833)
The only step that remains is to merge the verticies. Often merging the topology will take care of that for you, but not if they were further apart than the tolerance.

If you merge the 4 pairs of verts between two faces (the merged topology must match (face to face or OGrid (5 faces) to OGrid), then the faces will become one and the mesh will be connected.

After merging verts (pi.4) I get mesh (pic.5). Is it correct?

Quote:

Originally Posted by PSYMN (Post 239833)
Warning, because you combined 2 blockings, each with its own indecies, you should expect that to get a bit messy after the merge.

If you don't think this is the problem, post another pic of the contact area with the vertex numbers displayed.

Best regards,

Simon

Thank you, Simon

PSYMN December 14, 2009 10:26

Almost.
 
It is now correct in that the topologies are connected, but the topologies don't properly match/represent the geometry, so that is a problem.

To make the connection work well, you should block the side of the larger chunk as if the circle were already imprinted on it. Then it would just be a matter of hooking things up.

Simon

gajemon December 14, 2009 11:33

Quote:

Originally Posted by PSYMN (Post 239941)
you should block the side of the larger chunk as if the circle were already imprinted on it.
Simon

How can I make it? Please explain me
The realization of this --- it's my main problem.

PSYMN December 15, 2009 10:47

Need to see what it looks like.
 
Post an image of the surface of the large block where the pipe connects. From there I can sketch up an appropriate blocking... Or just send me (privately) your geometry (*.tin) and I can take a quick look that way.

PSYMN December 17, 2009 17:31

Suggested...
 
2 Attachment(s)
Ok, so we have a rectangle with a half circle tucked into the top left corner. This half circle is actually a pipe that extends all the way thru the larger block and must also be attached to the external pipe (another blocking file)...

The only tricky part is that the circle forms a cusp with the top of the block...

I have attached two images to cover the suggested blocking process.

If you can handle wedge blocks, 5a) would be best. If you must have hexa, then try the 5b) or 5c) option.

I gave instructions looking from the end, but assuming 3D (you could use the "Move Verts => Align" to keep things crisp). However, you could also do it in 2D and "Create block => 2D to 3D => Translate" to get the 3D blocking... We even have a guy here who creates the elements with the edit mesh => Create elements, and then uses the File => Blocking option to get the 2D blocking from the unstructured mesh, and then does the 2D to 3D translation.

Anyway, there are many ways from point A to point B, have fun with it.


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