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Old   April 3, 2007, 09:56
Default CFX and 2D projects
  #1
Zoran Karabaic
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Hello,

i tryed to check some 3d domains and compare them with 2d but i can't load 2d mesh in CFX. Before i used fluent for that but now wanna try with cfx. So the problem is that i can't load 2d mesh in cfx, is there some option for 2d or it can't process 2d ?

Thanke you

Zoran
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Old   April 3, 2007, 10:11
Default Re: CFX and 2D projects
  #2
Dr. Flow Squad
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CFX is 3D only. If you want to make 2D calculations with CFX, you have to extrude one layer height in the 3rd dimension. Have a look at the tutorials.
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Old   April 4, 2007, 09:54
Default Re: CFX and 2D projects
  #3
Felix
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Hi Zoran,

As Dr. Flow Squad said, CFX always solves in 3D. To make 2D calculations, create a "2D" mesh having only one layer thick. You will then impose a periodic boundary condition on these the two faces.

However, I am also new to this and I have a question too ! I've read the following thread : http://www.cfd-online.com/Forum/cfx_...cgi?read=19151 and I still don't understand how to name the faces in ICEM to have them in CFX. Here is what I do:

1 - I create the 2D surface in ICEM

2 - I name the edges (Inlet, Outlet, etc..)

3 - I create a 2D block, associate it to geom, mesh it.

4 - The pre-mesh is OK in 2D

5 - I create 3D block by extruding it from 2D

6 - The 3D pre-mesh is OK too

7 - I convert the pre-mesh to unstructured mesh and export it in .cfx5

When I load that mesh in CFX-Pre, there is only one 2D region (named Curves in my case) so I cannot directly impose my boundary conditions without first editind the mesh in Pre. I am sure there is a better (and faster!) way to do it. Anyone knows how I can bypass that last step ?

Any help will be appreciated !

Thanks, Felix
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Old   April 5, 2007, 08:44
Default Re: CFX and 2D projects
  #4
Felix
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The following post describes how to assign the names to the faces but it doesn't seem to work in my case.

http://www.cfd-online.com/Forum/cfx_...cgi?read=14962

Felix
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Old   April 5, 2007, 09:10
Default Re: CFX and 2D projects
  #5
Stumpy
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In general don't use periodic boundaries for the two faces in a 2D simulation. If the intention is for there to be no flow through those faces, then use a symmetry boundary.
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