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[ICEM] Problem with torus mesh

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Old   May 5, 2016, 11:49
Default Problem with torus mesh
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Hello everyone,

i am trying to create a mesh for the entire 3D tokamak model in the form of a torus with 3 layers (see first image).
I have created 2D mesh on a slice and rotate it to get 3D mesh as can be seen in this video: https://www.youtube.com/watch?v=JxUnEMbGBL4
I obtained very poor mesh (see second image). But I also tried with simple geometry (similar to this in video) and it works very well.
What am I doing wrong? Does anyone have some advice?
Is it possible that ICEM can not/unable to make a mesh for such a geometries?

Thanks!
Regards Luka
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File Type: jpg geometry.jpg (98.3 KB, 21 views)
File Type: jpg mesh_90.jpg (93.4 KB, 20 views)
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Old   May 9, 2016, 08:11
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Hi Luka,

Last question first, no, it is not possible that icem is unable to do such geometries. I'm pretty sure it is not so difficult. You could block your 2d slice? And, did you rotate fully to match your geometry, or did you stop in between, so that there are no surface geometries for you periodic faces?

Can you check your associations? I would redo them all since there aren't so many faces. Check vertices, edges, and face associations.

With regards,
Sebastian
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Old   May 9, 2016, 11:04
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Hi Sebastian
Thank you for reply.
I already find out that there was a problem in association. But I still have problems on the first and last surface after rotation as can be seen on pictures.
I blocked the 2D slice (see attachment) and then rotate it. If the slice is rotated through 360 I do not get the 3D mesh (see attachment).
But if is rotated for lower angle and copied, I get the whole 3D mesh. But as I said the mesh at first and last surface is very bad, elsewhere is ok. (see attachment)
Maybe is still problem with associating the inner face which options for association is most appropriate in my case?

Regards Luka
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File Type: jpg 2D_blocking.jpg (115.1 KB, 13 views)
File Type: jpg 360.jpg (118.7 KB, 12 views)
File Type: jpg mesh_slice_(90x4).jpg (142.5 KB, 15 views)
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Old   May 9, 2016, 13:02
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I think so, too. There is still a association problem.
First select the internal faces on the remaining 2d blocking and map them to their proper parts.
If this doesn't work, check if the created blocks are in their respective part. Rotating the 2d blocking might have moved some of the new blocks to a wrong part (Have a look at the mesh color in the 2nd screen to get the idea)
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Old   May 10, 2016, 11:40
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Sebastian, thank you for comments.
I think I solved the problem ....for once.

These associations are quite tricky.
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Old   May 31, 2016, 06:30
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Hi, it's me again...
All worked well until this case.
After the rotation of 2D mesh there are no some surfaces.
Missing surfaces can be seen on figure (see attachment).
It is hard to believe, that a problem is again in association.
What goes wrong?
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Old   May 31, 2016, 07:33
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solved
still associations...
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Old   June 6, 2016, 13:39
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Why you cannot solve this problem in one go?
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Old   June 7, 2016, 02:57
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What do you mean with one go?
Rotation for 360 or meshing all parts together.
I tried other options.....mostly unsuccessfully.
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Old   June 7, 2016, 10:08
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yes, i mean the 360 rotation.
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Old   June 9, 2016, 10:24
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care about sharing your geometry ?
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New to ICEM CFD, try this document --> https://goo.gl/NEbygB
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Old   June 9, 2016, 11:50
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Here is geometry.

I solved the problem by meshing each part separately.
On each part I did 2D mesh on a slice and then rotate it to get 3D mesh.

I needed some time that I found out how to use the association....
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Old   June 9, 2016, 11:52
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Here is geometry.
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Old   June 9, 2016, 12:10
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I have some problems...
I hope that this will work

https://www.dropbox.com/s/ro01iyb4juicyv1/one_divertor_cfx.stp?dl=0
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Old   June 12, 2016, 09:31
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I took a look at your geometry... I don't feel like meshing it since you solved your problem. FAR has an excellent video on how to do rotation of a mesh. I want to add something, although your approach is correct, I would have tackled the problem differently. You don't have to draw the full 3D geometry. You should have started with half or just a quarter, then made a copy of the mesh... saves a lot of times like that
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Old   June 13, 2016, 06:38
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I saw FAR's video and also did similar case for practice. It's very instructive.
I also did some cases with copying the mesh but for specific case I do not have symmetry, so I need to do the full 3D mesh. (I think so...?? )
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Old   June 13, 2016, 08:12
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I am not getting proper curves on one plane.

Moreover does the geometry follows some path or not? In other words can you create geometry from the 2d plane by revolving it around some axis?
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Old   June 13, 2016, 09:12
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Are you talking about geometry or mesh?
I create geometry from 2D plane by revolving it around Z axis for 360
But on the other side I can't do it with the mesh. If I rotate the 2D mesh for 360 around Z axis I get a weird mesh. But this approach works on simple geometries.
In my case I need to rotate it for smaller angle and then copy it to get the whole 3D mesh. (20 *18)
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