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[ICEM] Blocking a triangular surface

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Old   May 23, 2013, 09:28
Default Blocking a triangular surface
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I'm blocking and meshing a domain depicted in the figure below. The two rectangles and the triangle with a fillet in the tip are not included in the fluid zone. My problem is that I haven't managed to create a satisfactory mesh for the domain near the triangle surface, there are some non-orthogonal faces.

I've attached pictures of my current blocking and mesh. I'm sure that this is an easy task but I just can't figure it out.
Attached Images
File Type: png domain.png (45.0 KB, 72 views)
File Type: png blocking.png (40.6 KB, 77 views)
File Type: png mesh.png (53.5 KB, 69 views)
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Old   May 23, 2013, 10:21
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Can you share your .tin file?
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Old   May 23, 2013, 10:30
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Hi,
Your mesh (3rd picture) looks bad... the triangle looks like a pyramid, did you assign all edges to the curves? Some of the quads are "cutted" at the edge of the triangle.

Anyway: If I recall correctly, user "far" showed a good blocking for triangles in some thread, maybe that helps:
triangle meshing.png
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Old   May 23, 2013, 14:21
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there is no triangular block at all

What he needs is the Ogrid around round triangular surface and inside it as well
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Old   May 23, 2013, 14:35
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Thanks for replys. RodriguezFatz: yes, I did assign them. I also found this video a few days ago http://www.youtube.com/watch?v=92vScop7b8Q but didn't manage to get things working.

Anyway, I will be out of office until Monday but will report my results after giving it another try.
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Old   May 23, 2013, 15:12
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Quote:
Originally Posted by Far View Post
there is no triangular block at all
But what about the triangular faces of the middle body? He needs to mesh the front and back of it.


@esgee: Did you cut the middle body, or why does the screenshot of the grid look so strange?
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Old   May 23, 2013, 15:13
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Just think it as a circular leading edge of wing and apply same strategy as you would apply there
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Old   May 24, 2013, 02:01
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Why not like this?
blocking.png
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Old   May 24, 2013, 02:14
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This is the best option if your geometry is of triangle shape. If it is round at corner then you need ogrid inside and outside
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Old   May 24, 2013, 02:17
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Yes the top hexas will be crap in my blocking...
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Old   May 24, 2013, 02:24
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Quote:
Originally Posted by RodriguezFatz View Post
Yes the top hexas will be crap in my blocking...
Not exactly. The blocking you have shown will give a reasonable quality. However best option is O-grid
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Old   May 24, 2013, 03:19
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Quote:
Originally Posted by Far View Post
Not exactly. The blocking you have shown will give a reasonable quality. However best option is O-grid
Doesn't that depend strongly on the way the flow takes, i.e. on the inlet and outlet positions?
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Old   May 24, 2013, 03:23
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Hi guys,

Iīve done a quickly blocking. I think this blocking can be improve better, maybe this block is similar to Philippīs idea. Anyway, if anybody want to try I give you the geom here!

https://www.dropbox.com/s/heej79l4v9...riangleBox.rar
Attached Images
File Type: jpg Determinant 3x3x3.jpg (50.4 KB, 48 views)
File Type: jpg Volume Change.jpg (52.1 KB, 43 views)
File Type: jpg Min Anlge.jpg (53.5 KB, 44 views)
File Type: png 4.PNG (51.4 KB, 49 views)
File Type: png 5.PNG (42.9 KB, 44 views)
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Old   May 25, 2013, 17:21
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Far, would be so kind draw a simple picture with the blocking approach? I mean, like Philipp did. Itīs only to see the blocking shapes arround the round tip. Thank you!
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Old   May 27, 2013, 07:33
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Hello again. I tried to apply same approach as FJSJ but my grid is still bad.

e: I finally managed to solve it. Thanks for your kind effort.

Last edited by esgee; May 28, 2013 at 07:54.
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Old   May 27, 2013, 08:23
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well, itīs not my approach, in any way, it would be Philippīs approach. Anyway, this is not the best blocking. Farīs idea is the best, at least, I think so. But I would see some picture with blocking edge, like Philipp did.
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Old   May 28, 2013, 15:35
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Quote:
Originally Posted by FJSJ View Post
Far, would be so kind draw a simple picture with the blocking approach? I mean, like Philipp did. Itīs only to see the blocking shapes arround the round tip. Thank you!
Sorry for long delay, I was busy with making end term exam paper and other stuff at university

Min quality 0.66 and min angle 44.

Files are attached.

Here is the blocking:











PS: Dedicated to Simon
Attached Files
File Type: zip Blocking a triangular surface.zip (21.8 KB, 16 views)
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Old   May 29, 2013, 02:53
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Thanks you for explaining the blocking with the O-grid!
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Old   May 31, 2013, 17:08
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Was mine blocking different? did it give you good quality?
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Old   May 31, 2014, 03:52
Default 3D Wing
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Hi Far
I have to mesh the fluid around this 3d Wing. As you see i have a complex 3D Wing and i have to mesh it, the problem is the vertical part of the wing and as you see here i have splitted it to 3 parts. To have a good mesh i need to split the left and right Blocks to Blocks with triangle Surfaces to fit with the parts of vertical Surface.

Could you please give me an idea to do that or mesh it?

Thanks
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File Type: jpg 1.jpg (58.9 KB, 11 views)
File Type: jpg 2.jpg (44.8 KB, 14 views)
File Type: jpg 3.jpg (36.4 KB, 15 views)
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