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-   -   [GAMBIT] Thin Plate meshing (http://www.cfd-online.com/Forums/ansys-meshing/119781-thin-plate-meshing.html)

Shinobi June 25, 2013 03:44

Thin Plate meshing
 
1 Attachment(s)
Hi all,
I have a structure as in attachment. That is a thin plate 10*10 and thickness 0.05 on which is positioned a parallelepiped with base 1*1 and height 3.

Which is the fast way to mesh this structure in gambit?
I'm interested only Heat transfer, that is my BC must be simple temperature on faces.
Thanks all

-mAx- June 25, 2013 04:26

split your domain at the 1x1x3 basis.
Now you are able to mesh the 10x10x0.5 with cooper, and also the 1x1x3 parallepiped

Shinobi June 25, 2013 06:02

1 Attachment(s)
Quote:

Originally Posted by -mAx- (Post 435745)
split your domain at the 1x1x3 basis.
Now you are able to mesh the 10x10x0.5 with cooper, and also the 1x1x3 parallepiped

Hi max,
I split my domain, I mesh parallepiped but I cannot mesh plate because a surface cannot be meshed.
I translate this surface to see you the problem.

-mAx- June 25, 2013 06:21

you have to follow an order:
First mesh one of top faces from parallepiped, then mesh the parallepiped volume.
Now mesh the surface you displayed with the translation (not the translated one ;) )
Pick the thin volume, and select cooper (if not automatically selected).
As sources select the one you meshed, and the opposite one, but don't mesh it.
It should be ok.
Then you just have to set the node distribtion in the depth

Shinobi June 25, 2013 06:32

Quote:

Originally Posted by -mAx- (Post 435791)
Now mesh the surface you displayed with the translation (not the translated one ;) )

???
I don't know mesh translation.
Edit, LOL Now I understood what you meant!

All right, only 2 problems:
1) to mesh thin plate, he requires 3 faces: meshed, unmeshed and a face in common with
parallepiped. It's ok?
2)Gambit tell me: "Warning: The desidered meshing scheme of Map could not be maintened by the Cooper tool for face 1 (face 1 is that unmeshed opposite displayed face) when meshing volume. You may want to tryng meshing this face first "

-mAx- June 25, 2013 06:43

you translated a surface, right (the blue one) ?

Shinobi June 25, 2013 06:59

Quote:

Originally Posted by -mAx- (Post 435799)
you translated a surface, right (the blue one) ?

Yes, I edi last message.
:D

All right, only 2 problems:
1) to mesh thin plate, he requires 3 faces: meshed, unmeshed and a face in common with
parallepiped. It's ok?
2)Gambit tell me: "Warning: The desidered meshing scheme of Map could not be maintened by the Cooper tool for face 1 (face 1 is that unmeshed opposite displayed face) when meshing volume. You may want to tryng meshing this face first "

-mAx- June 25, 2013 07:04

1) yes sorry 2 surfaces common level, and the opposite (gambit will automatically project mesh on this last surface)
2) it can be that the opposite is not mappable, but you can fix it, by changing vertex type
http://aerojet.engr.ucdavis.edu/gamb...h_face_setvrtx

Shinobi June 25, 2013 09:14

Quote:

Originally Posted by -mAx- (Post 435806)
2) it can be that the opposite is not mappable, but you can fix it, by changing vertex type
http://aerojet.engr.ucdavis.edu/gamb...h_face_setvrtx

that is?
I'm noob.
:-)
My vertex become End vertex in this case?
I select face, and after in vertices box I insert 4 vertex of that face?
Or I must change vertex of dispayed face?

-mAx- June 25, 2013 09:16

first try to mesh the surface with quad/map
does gambit selects automatically this schema?
If not try to enforce quad/map
If it fails, then check Vertex type: all 4 nodes have to be set as End

Shinobi June 25, 2013 09:24

Quote:

Originally Posted by -mAx- (Post 435806)
1) yes sorry 2 surfaces common level, and the opposite (gambit will automatically project mesh on this last surface)
2) it can be that the opposite is not mappable, but you can fix it, by changing vertex type
http://aerojet.engr.ucdavis.edu/gamb...h_face_setvrtx


Ok, I solved.
They are vertex side.
This is the fastest way to mesh this cases?
I cannot insert a size function, for example, to automate the process?

Last question.
There's a part in Manual (or other source) where is explained how mesh in this case and in other case?
Because this type of mesh is new for me.

Shinobi June 25, 2013 09:26

Quote:

Originally Posted by -mAx- (Post 435865)
first try to mesh the surface with quad/map
does gambit selects automatically this schema?
If not try to enforce quad/map
If it fails, then check Vertex type: all 4 nodes have to be set as End

It meshes with Quad/pave

-mAx- June 25, 2013 09:28

you can mesh more quickly with unstrured mesh and size function.
But in your case, you have thin plate, which means your mesh will explose (cell's size) because of the small height.
It is better to handle this plate with cooper (10-20 cells in depth).
But you can try on your own, you will see what I mean.

-mAx- June 25, 2013 09:29

Quote:

Originally Posted by Shinobi (Post 435871)
It meshes with Quad/pave

It is also ok, but you can enforce with quad map

Shinobi June 25, 2013 09:40

Quote:

Originally Posted by -mAx- (Post 435872)
you can mesh more quickly with unstrured mesh and size function.
But in your case, you have thin plate, which means your mesh will explose (cell's size) because of the small height.
It is better to handle this plate with cooper (10-20 cells in depth).
But you can try on your own, you will see what I mean.

Yes, I try... for this I open here this 3d :D
A source to learn how mesh in several cases with gambit?
Or it is only experience?

Shinobi June 25, 2013 09:43

Quote:

Originally Posted by -mAx- (Post 435873)
It is also ok, but you can enforce with quad map

I try:" error bad interval. It recommends submap" but also it generates "unexpected problems".

-mAx- June 25, 2013 09:45

Are you meshing all the edges?

Shinobi June 25, 2013 09:50

Quote:

Originally Posted by -mAx- (Post 435877)
Are you meshing all the edges?

Scheme was:
1)mesh one of top faces from parallepiped
2)mesh the parallepiped volume
3)mesh displayed surface
4)change vertex of opposite face
5)Pick the thin volume, and select cooper as sources meshed face, the opposite one and face in common with parallepiped.
When I mesh edges?

-mAx- June 25, 2013 09:59

before meshing the thin volume with cooper, you need to mesh the surface which lies at the height than parallepiped basis.
That means from thin volume you have one cap full meshed (2 surfaces)
Pick those 2 surfaces as source and the opposite (cooper selected).

If Gambit cannot mesh the opposite surface, try to mesh it alone with quad or pave (without meshing edges first)

Shinobi June 25, 2013 10:29

Quote:

Originally Posted by -mAx- (Post 435879)
before meshing the thin volume with cooper, you need to mesh the surface which lies at the height than parallepiped basis.
That means from thin volume you have one cap full meshed (2 surfaces)
Pick those 2 surfaces as source and the opposite (cooper selected).

If Gambit cannot mesh the opposite surface, try to mesh it alone with quad or pave (without meshing edges first)

I don't understand, so I prefer repeat logic schem.
1)mesh one of top faces from parallepiped (OK)
2)mesh the parallepiped volume (OK)
3)mesh displayed surface with quad/map-->error! I must mesh with quad/pave. After no problem with other steps. How can I solve it?


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