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Eizo May 16, 2012 07:19

Problem with meshing half NACA0009 in 3D

I have a huge problem with meshing half NACA0009 profile fin. Previously I have done meshing only in 2D and now I face a problem with doing mesh in 3D. I done tetra mesh and tried to import it to Fluent, but with no result. There was an error message "Segmentation Voliation". I`m dealing with this problem for one week. If anybody could give me some hints or an advice, I would be grateful. Thanks in advance.

Screens of the problem:

Ralen May 16, 2012 07:36

Can attach a ICEM project?

Eizo May 16, 2012 08:21

Yes, of course. This is only test one, so the mesh is very coarse. Here it is:

Ralen May 16, 2012 08:29

This is only project file without geometry (*.tin) and blocking (*.blk). ;)

Eizo May 16, 2012 08:36

As I said, I`m new here and I read that you would like to see the project :o .

Ralen May 16, 2012 09:00

It's not so simple as in 2D. A similar example in the topic naca0012. I was just trying to mesh.

Eizo May 16, 2012 09:03

I know that. As I said, I stuck in this point and I can`t go forward :( ...

Far May 16, 2012 09:07

attach .tin file

Eizo May 16, 2012 09:11

Ralen May 17, 2012 06:13

2 Attachment(s)
That's one of the variants of the mesh.

Eizo May 18, 2012 11:22

Thank you very much for that. Can you give me some explanation how you done that? I see some blockin, but I have only rough idea what`s going on there. Thank you in advance.

Best regards

Ralen May 21, 2012 03:57

5 Attachment(s)
1. Create 3D Block and split it as shown in pictures 1 & 2.
2. Create O-grid for area around wing as shown in picture 3.
3. Create O-grid for area inside wing as shown in picture 4.
4. Merge all vertices in thin blocks except six inside wing as shown in picture 5.

Ralen May 21, 2012 04:08

5 Attachment(s)
5. Associate & move vertices as shown in pictures 6 & 7
6. Remove six blocks inside wing as shown in picture 8.
7. Associate faces of the wing to the surfaces of the wing ("FIN") as shown in picture 9
8. Align vertices along the z axis. Move vertices as shown in picture 10

Ralen May 21, 2012 04:12

1 Attachment(s)
9. Set the size for the mesh. (I use the global size 20 and 2 for the curves of the wing). Move the vertices to improve a quality!

Far May 21, 2012 05:22

Well done :)

Ralen May 21, 2012 05:55

You can also create the o-grid block along the axis Y before merge vertices.

Eizo May 22, 2012 05:22

Thank you for that Ralen, that was very helpful. You are the man :)

Eizo June 1, 2012 05:06

I now doing 3D mesh for two fins, which are canted and toed in. In near future I`m going to do the mesh for 3 fins. I meet problems with assigning inner vertices (FIN1.png) to surface of the fin (FIN2.png). When I`m doing premesh, the software screams so error, and the mesh don`t have shape of the geometry.

Far June 1, 2012 07:28

i cannot see the pics

Eizo June 1, 2012 07:53


Here is the model:

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