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-   -   2D simulation - ICEM meshing for CFX question (http://www.cfd-online.com/Forums/cfx/23836-2d-simulation-icem-meshing-cfx-question.html)

Ben Makhal April 10, 2007 02:05

2D simulation - ICEM meshing for CFX question
 
Dear Sirs,

I've been trying to get the grid in ICEM for Ansys CFX to make 2D simulation.

I would like to have 3D mesh with 1-element width to use Symmetry condition on the flat surfaces. To do this I use ICEM in the following manner:

1. Create plane drawing 2. Surface mesh this drawing 3. Extrude mesh to 1 layer 4. Output to CFX

As a result I have 3D mesh in ANSYS CFX, but I can't make any boundary conditions as I have no 2D regions.

Could you help me? What steps should I do to make 3D mesh with 1-element width? I would like to have the mesh like in "Free Surface Flow Over a Bump" in the CFX tutorial.

Thank you!

Joe April 10, 2007 06:29

Re: 2D simulation - ICEM meshing for CFX question
 
There are icemcfd tutorials in the icemcfd help file that cover this.

myron April 10, 2007 09:29

Re: 2D simulation - ICEM meshing for CFX question
 
Once you've extruded the mesh to have one 3D element thick - you need to make sure you have surface elements all around. You can use the Edit Mesh > Check Mesh function for this. (Look for uncovered faces.) Then you can move these surface elements into appropriate groupings for boundary conditions.

Ben Makhal April 11, 2007 03:48

Re: 2D simulation - ICEM meshing for CFX question
 
Thank you, Joe!

Could you point me to the appropriate tutorial? Unfortunately, I can't find it myself.

Joe April 11, 2007 07:14

Re: 2D simulation - ICEM meshing for CFX question
 
Icemcfd help manual

Felix April 11, 2007 08:44

Re: 2D simulation - ICEM meshing for CFX question
 
Hello,

The following topic might help you:

http://www.cfd-online.com/Forum/cfx.cgi?read=19816

Before extruding your mesh in ICEM, put all mesh elements in a specific part (say symmetry1). Then extrude it using the dialog boxes to specify the names for the "top" (let's say symmetry2)and the sides (sides). In CFX-Pre you'll find thoses 3 names that define the mesh. You can right-click on any of them to edit your mesh and split the part "sides" in "inlet", "outlet", "top", etc...

There is probably a way to name the sides with different names in ICEM but I still haven't figured it out yet.

Hope this helps,

Felix


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