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Old   December 1, 2005, 05:47
Default how to create structured geometry
  #1
Rashmi
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hi all

i have to mesh a symmetry cylindrical pipe with structured meshing using gambit version 2.1.6.can any one tell me the steps for creating this . any suggestions are always welcome

regards Rashmi
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Old   December 1, 2005, 06:41
Default Re: how to create structured geometry
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HS
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Hello!

I think it would be good to follow a tutorial on meshing in GAMBIT. Here is an example of one, where a step-by-step procedure to meshing a 2D pipe is given:

http://instruct1.cit.cornell.edu/courses/fluent/

Hope this helps!

/Henrik
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Old   December 1, 2005, 07:44
Default Re: how to create structured geometry
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Rashmi
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thanx for your reply..but i have to create 3D geometry not 2D. if u have any tutorial on this plz forward. thanks again regards Rashmi
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Old   December 1, 2005, 08:11
Default Re: how to create structured geometry
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HS
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If you just need to mesh a straight pipe then you can create a cylindrical volume and mesh it with the Cooper scheme (standard in GAMBIT for cylindrical volumes). I think you can figure it out with the 2D tutorial at hand.

Otherwise, there is a somewhat more complicated 3D geometry in this tutorial:

http://www.fluent.com/software/unive...ial_3/tg03.pdf

There should be no problems extracting the facts you need to create a just pipe from that, I think.

Good luck!

/Henrik
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Old   December 1, 2005, 08:47
Default Re: how to create structured geometry
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HS
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I didn't see until now that you said you needed a structured mesh... Well, maybe the Cooper scheme is not any good then. Maybe someone else has a better suggestion?

/Henrik
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Old   December 1, 2005, 22:38
Default Re: how to create structured geometry
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pah
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Hi everybody!

The suggestion of HS is so greate, however I think that we can get three-dimentional cylinder by using extrude command from the two-dimensional cylinder. Actually, I did not use Gambit for along time, but I think it is possible.

1. Firtly, you create 2D cylinder.

2. And then, draw a line as your design, make node number on it.

3. Finally, extrude the 2D grid based on the noded line. And we'll get 3D in Structure.

Goodluck!

pah
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Old   December 1, 2005, 22:54
Default Re: how to create structured geometry
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Rashmi
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sorry i could not follow your steps of creating 3D geometry from 2D. plz elaborate thanks Rashmi
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Old   December 1, 2005, 23:05
Default Re: how to create structured geometry
  #8
pah
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Sorry about that,

However, which step that you could not do. In creating 2D cylinder or extrude command. At this time, I use the Gridgen only, therefore I'm not so sure about the extrude command, but creating cylinder in 2D is possible with structure grid. I will check it and let's you know soon.

pah
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Old   December 2, 2005, 01:04
Default Re: how to create structured geometry
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Rashmi
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hi i created 2d cylinder(rectangular) and meshed it . now how to proceed to make it 3D
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Old   December 2, 2005, 08:11
Default Re: how to create structured geometry
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Vijay
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Dear Rashmi,

Kindly read section 3-4.1 of the GAMBIT modeling guide. You will have to split the cylinder by creating 4 vertices on each circular face and then joining the vertex on one circular face to that on the circular face at the other end and thus create four edges. Thus ,you split the edges that circumscribe the end caps and use the resulting vertices to split the cylindrical face into four separate faces, the end faces become mappable. Vijay.
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Old   December 2, 2005, 08:48
Default Re: how to create structured geometry
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Murthy
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It's quite easy to do structured meshing.

Here is the procedure just follow it for a quarter column then u can easily extend it to half column.

1. Create face by giving width,hegiht

2. Revolve that face 90 degree about axial axis, now u will get quarter cylinder. 3. Before you volume mesh it, go to mesh menu, click face mesh then click 4th icon i.e set face vertex type there u find End, Reversal, Trielement..etc. 4. Now, Selecet your inlet face in Face dropdown list and in the Type option select Trielement Type. In the Vertices dropdown list select centre vetex i mean where your two straight edged meet modify it from end type to trielement. 5. Don't modify other two vertices lying on circumference let them be end type. 6. Repeat the same for your Outlet face. 7. Do edge meshing as you need and ensure equal intervals on inlet face endges. 8. Next Face Meshing, Select your inlet and outlet faces

Elements: Quad/Tri

Type : Wedge Primitive 9.Finally Volume Meshing, Select your volume

Element : Hex/wedge

Type: Cooper and your sources will be inlet,outlet faces. u can get desired Mesh.

It should work now. Murthy

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