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-   -   [ICEM] Blocking a triangular surface (http://www.cfd-online.com/Forums/ansys-meshing/118242-blocking-triangular-surface.html)

esgee May 23, 2013 09:28

Blocking a triangular surface
 
3 Attachment(s)
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.

FJSJ May 23, 2013 10:21

Can you share your .tin file?

RodriguezFatz May 23, 2013 10:30

1 Attachment(s)
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:
Attachment 22057

Far May 23, 2013 14:21

there is no triangular block at all :o

What he needs is the Ogrid around round triangular surface and inside it as well

esgee May 23, 2013 14:35

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.

RodriguezFatz May 23, 2013 15:12

Quote:

Originally Posted by Far (Post 429580)
there is no triangular block at all :o

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?

Far May 23, 2013 15:13

Just think it as a circular leading edge of wing and apply same strategy as you would apply there

RodriguezFatz May 24, 2013 02:01

1 Attachment(s)
Why not like this?
Attachment 22077

Far May 24, 2013 02:14

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

RodriguezFatz May 24, 2013 02:17

Yes the top hexas will be crap in my blocking... ;)

Far May 24, 2013 02:24

Quote:

Originally Posted by RodriguezFatz (Post 429689)
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 :D

RodriguezFatz May 24, 2013 03:19

Quote:

Originally Posted by Far (Post 429690)
Not exactly. The blocking you have shown will give a reasonable quality. However best option is O-grid :D

Doesn't that depend strongly on the way the flow takes, i.e. on the inlet and outlet positions?

FJSJ May 24, 2013 03:23

5 Attachment(s)
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

FJSJ May 25, 2013 17:21

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!

esgee May 27, 2013 07:33

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.

FJSJ May 27, 2013 08:23

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.

Far May 28, 2013 15:35

1 Attachment(s)
Quote:

Originally Posted by FJSJ (Post 430036)
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 :D

Min quality 0.66 and min angle 44.

Files are attached.

Here is the blocking:

http://imageshack.us/a/img11/9628/tr...locking001.jpg

http://imageshack.us/a/img191/4567/t...locking002.jpg

http://imageshack.us/a/img153/9126/t...locking003.jpg

http://imageshack.us/a/img266/917/tr...locking004.jpg

http://imageshack.us/a/img163/1407/t...locking005.jpg

PS: Dedicated to Simon

FJSJ May 29, 2013 02:53

Thanks you for explaining the blocking with the O-grid!:)

Far May 31, 2013 17:08

Was mine blocking different? did it give you good quality?

mojtaba12 May 31, 2014 03:52

3D Wing
 
3 Attachment(s)
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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