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-   -   Gambit mesh for cylinder (http://www.cfd-online.com/Forums/fluent/36913-gambit-mesh-cylinder.html)

Kavia June 10, 2005 12:19

Gambit mesh for cylinder
 
dear friends,

When I mesh a cylinder with cooper, how can I control the mesh size in the axial direction ? I can not find the option to do so ( I generated the cylinder directly and mesh the two bases)

Thiyaga June 10, 2005 12:28

Re: Gambit mesh for cylinder
 
Hi, try to mesh the side wall first, then go for bases. regards..

anindya June 10, 2005 15:22

Re: Gambit mesh for cylinder
 
It depends on how you generate the cylinder. If you creat a cylinder using the 3D cylinder model generation in gambit directly, you have problems meshing in the axial direction.

I would suggest that you great a circle with a diameter equal to that of the cylinder. mesh the cirle as you would like it to be. Then protude the cirlce in the direction you want for the length of the cylinder and choose the option (with mesh). In that way you will generate a cylinder that will have both the upper and lower circular surfaces meshed. Now you can also specify the mesh as you like for the length (axial direction).

pah June 12, 2005 22:59

Re: Gambit mesh for cylinder
 
Hi Kavia and everybody!

I made the mesh for cylinder in 2D and 3D, and I think you can make Cylinder 3D by using Extrude from 2D in the direction that you design (in 2D I did not make a full circle, it exists 4 parts). From there, you have some Edges in the axial direction, they can be controled by your distribution. Best regard!

pah

Kavia June 13, 2005 13:00

Re: Gambit mesh for cylinder
 
Thanks for all of your reply. Could you tell me where is the extrude option in the GAMBIT ? I can't find it.

zxaar June 13, 2005 21:24

Re: Gambit mesh for cylinder
 
well i have been doing lot of meshes for cylinders and to use cooper with the kind of mesh you want you have to cut the cylinder into four parts (the circular section into four 90 deg sectors), now once you have these sectors, describe the distribution on the edges in the direction to creat prism meshes, and just use cooper tool to create the mesh, for smooth cylinders its as easy as 10 mins job


pah June 14, 2005 06:22

Re: Gambit mesh for cylinder
 
Yes!

The Extrude command You can find in the generation Volume button. Or you can contact to me, if I can, I will help you. hungaerospace@yahoo.com

pah

Mehdi Ghoddosy June 19, 2005 00:31

Re: Gambit mesh for cylinder
 
Dear Kavia:

I suggest use down-top approach(first creat cap circles). now,you can split the cap circle into for curves at 45 degree.Then change these vertex types to END. THen split the curves on the top and bottom at +90 and -90.Now you have 6 curves. grade the four edges in the top and botom to achive finer mesh at corners. Now you can mesh these circle using map scheme. and then mesh side faces and use cooper scheme to mesh the volume. In this way you can control mesh sizes in all directions.

REgards


zeeshanboom December 29, 2010 07:14

Hi anindya
 
Hi,
Plz elaborate how can we mesh in axial direction once we have extruded 2D circular mesh in axial direction.
Thnx and Regards


Quote:

Originally Posted by anindya
;121441
It depends on how you generate the cylinder. If you creat a cylinder using the 3D cylinder model generation in gambit directly, you have problems meshing in the axial direction.

I would suggest that you great a circle with a diameter equal to that of the cylinder. mesh the cirle as you would like it to be. Then protude the cirlce in the direction you want for the length of the cylinder and choose the option (with mesh). In that way you will generate a cylinder that will have both the upper and lower circular surfaces meshed. Now you can also specify the mesh as you like for the length (axial direction).


-mAx- January 3, 2011 02:04

in Fluent or in Gambit?

zeeshanboom January 3, 2011 02:42

meshing this geometry in gambit
 
3 Attachment(s)
Hi,
Since last week am stuck in meshing this geometry, its riser of a circulating fluidised bed. The two extruded small pipes are soild inlet and gas-solid outlet. The bottom of riser is gas inlet and top is wall. i want very fine grid near wall.

I have tried following approaches but failed :
a.)unstructured grid, directly meshing using vol. mesh.
b.)Boundary layer (i didn't understood how to apply it ).
c.)Created a circle wid 4 sectors and then meshed them separately but problem is now i have 4 meshes how wud i join them?

Please help am beginner in Gambit and a big fan of this forum.

Regards
Zeeshan



Quote:

Originally Posted by -mAx- (Post 289051)
in Fluent or in Gambit?


-mAx- January 3, 2011 02:49

You cannot mesh directly your geometry with hexa
Check Tutorial 7 from Gambit: Modeling Flow in a tank

zeeshanboom January 3, 2011 03:01

'll give it a shot :)
 
Thnx Max!

Regards
Zeeshan

alilouu February 3, 2011 17:58

THE ONLY SOLUTION WITHOUT TRYING TO redrawing the cylindre is to tick
pro intervals, if yu need 10 elements in the axial direction, tick 10
good luck

jonbonraki September 10, 2011 11:42

hi all i have the following error while trying to open the gambit, can u please tell me hoe do i fix it.
gambit XIO: fatal IO error 0 (Winsock Error) on X server JONBONRAKI-PC:0.0
after 0 requests (0 known processed) with 0 events remaining.

kkpal September 26, 2013 00:16

how about the cylinder imported from Autocad
 
hi,
I'm having a problem with meshing a 3-D cylinder with adaption(like helix) imported from Autocad .sat file.
Since the cylinder is imported in gambit as a whole volume, there is no edge on the cylinder in the axial direction.It is difficult to control the mesh quality in the axial direction.

any one knows how to solve this problem?

-mAx- September 26, 2013 00:34

do some splits


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