# 3D Pipe Model for Fluent4.5

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 July 2, 2000, 20:59 3D Pipe Model for Fluent4.5 #1 Elvin Heng Guest   Posts: n/a Can anyone help? I am trying to generate a 3-d structured mesh using Gambit. The objective is to model multiphase flow in a 3-d pipe in Fluent4.5. I've tried: (1) Generating a mapped volume mesh in Gambit (not suitable for Fluent4.5) (2) Decomposing the geometry into two half cylinders and joining the meshed volumes (3) Extruding a face mesh to create a volume. None of these have worked because rotationally cyclic 3D geometries need (a) Z-axis as the centreline (b) a finite Inner Radius (which eliminates the possible use of a symmetry boundary for a half cylinder) Can anyone help recommend a way of generating a 3-d cylindrical structured mesh for a simple pipe geometry to be used in Fluent4.5? Thanks. Elvin.

 July 3, 2000, 10:09 Re: 3D Pipe Model for Fluent4.5 #2 John C. Chien Guest   Posts: n/a (1). I am not using the code. But I think you can first generate a 2-D structured mesh and rotate it along the axis to generate a 3-D structured mesh. (2). Similar to the cylindrical coordinates system. First, in the z-r plane, you create a long rectangular domain and generate a structured mesh. Then, define the axis, and rotate the domain and the mesh to create the 3-D structured mesh for the pipe.

 July 3, 2000, 12:12 Re: 3D Pipe Model for Fluent4.5 #3 David Minns Guest   Posts: n/a Hi, I assume from your email address that you are from a university ? If so then for a discounted rate (800GBP) you could purchase a new mesh generation tool. If you have a regular requirement for fully structured meshes then investing in ICEM CFD (www.icemcfd.com) could save you a lot of time in the long term. You could then also use your mesh with any of the 100 supported solver formats. I hope this helps and good luck regards David

 July 3, 2000, 14:25 Re: 3D Pipe Model for Fluent4.5 #4 Shyam Kishor Guest   Posts: n/a The best structured mesh for such a domain would be an O -type mesh. You can create such a mesh in Gambit with few steps : 1) Divide the cylindericl volume in four volumes using a brick, 2) ensure that two of the volumes are "disconnected" at one interface 3) mesh each volume with wedge/hex elements. Please see the "FAQ" available through online help of Gambit, for more details along with a sample journal file.

 July 3, 2000, 19:49 Re: 3D Pipe Model for Fluent4.5 #5 Jin-Wook LEE Guest   Posts: n/a Dear Elvin I think that you can acheive your purpose by using following commands, by 'text user interface' of Fluent 4.x. S1(setup 1) --> MG(Manipulate Grid) -> 3D-from-2D S1 --> MG --> SWAP IJK (if necessary) S1 --> MG --> SWAP XYZ (if necessary) Sincerely, Jinwook

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