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Old   July 31, 2008, 09:36
Default 2D Simulations in ANSYS CFX
  #1
CFDLife
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Hi-

I have been doing 3d simulations with ANSYS CFX. Now, i want to solve a CFD heat transfer problem using a 2D simulation (the 3d is very complicated and time consuming).

For 3D, i would create my fluids model in designmodeler and mesh in CFX Mesh and then set it up in CFX-Pre and run it.

For 2D, when i create the Designmodeleer geometry, and click on NEW MESH, it does not take me to the regular CFX Mesh page, but another meshing page, where i can mesh it in 2D. But i am confused as to how to set up BCs and run this simulation. I can't import this 2d mesh in CFX-Pre.

Am i doing something wrong here, Please Help.

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Old   July 31, 2008, 10:44
Default Re: 2D Simulations in ANSYS CFX
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John
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Are you using Workbench? Which version? Is your model truly 2D? CFX can't solve a truly 2D model; it needs a model with some finite thickness. For example, if I wanted to run a flat plate I would create the model to have some small thickness, say 0.001" or a millimeter. When you mesh you then have to specify the mesh as an "extruded 2D mesh."

Hope this helps!

John
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Old   July 31, 2008, 11:39
Default Re: 2D Simulations in ANSYS CFX
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CFDLife
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Yes, I am using workbench (Release 11.0)

Yes, the model is truly 2D.

As per your suggestion, i created the same model with a thickness of 0.003 mm. Then i Click on CREATE MESH, and it gives me an error saying - "No Valid Bodies Found".

Where do i locate the option - extruded 2d mesh?

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Old   July 31, 2008, 11:46
Default Re: 2D Simulations in ANSYS CFX
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John
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In the mesher it will be on the menu tree under Mesh>Options. Change "advancing front and inflation" to "extruded 2D mesh"
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Old   July 31, 2008, 16:12
Default Re: 2D Simulations in ANSYS CFX
  #5
MAB
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you could use a thickness of about 0.001 or 0.01 m . when you click on mesh , if it doesn't take you straight to CFX Mesh then you should right clich on mesh then insert Method. and choose method type to CFX Mesh. then right click on it and click Edit in CFX Mesh . for extruded 2D Mesh you could look into tutorials.

MAB
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Old   July 31, 2008, 17:27
Default Re: 2D Simulations in ANSYS CFX
  #6
Rogerio Fernandes Brito
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Mr. CDFLite, could you send me your mesh? I would like to help you, if you want it.

Best

MSN: rogeriobrito2007@hotmail.com Skype: rogeriofbrito
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Old   August 1, 2008, 08:03
Default Re: 2D Simulations in ANSYS CFX
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CFDLife
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yes, i am trying the mesh with a small thickness and i am able to mesh it as 3D now. I used to use Fluent a lot and the procedure to use a 2d and a 3d mesh was the same, so i thought the CFX would also work the same way.

My settings are already set to open in CFX Mesh as i have been working on it for a while now. It opens perfectly fine when am working on a 3D geometry.
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Old   August 1, 2008, 08:05
Default Re: 2D Simulations in ANSYS CFX
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CFDLife
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Rogerio-

Thank you so much for offering your valuable time. I am being able to mesh it with a small thickness, so i should be fine. I will let you know if i run into some trouble.

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Old   August 1, 2008, 08:51
Default Re: 2D Simulations in ANSYS CFX
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Rogerio Fernandes Brito
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for 3d in icem cfd after in cfx-pre, use simmetry as bc on z direction with 1 mm of thickness on z direction!
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Old   August 1, 2008, 13:14
Default Re: 2D Simulations in ANSYS CFX
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CFDLife
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Hi Rogero-

i am emailing you my geometry, could you please look at it.

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Old   August 1, 2008, 14:04
Default Re: 2D Simulations in ANSYS CFX
  #11
Rogerio Fernandes Brito
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Send the file in SolidWorks 2008 , 2007 or 2007...
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