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-   -   Importing or Creating 2D Flat Surfaces into CFX (http://www.cfd-online.com/Forums/cfx/24014-importing-creating-2d-flat-surfaces-into-cfx.html)

Sam May 22, 2007 06:45

Importing or Creating 2D Flat Surfaces into CFX
 
Hi there

I'm attempting to model a refrigeration unit in ANSYS CFX, and an important part of the modelling process is the use of 2D flat surfaces with no depth. However, every time I attempt to import a model from Pro/Engineer into ANSYS CFX that uses the flat surfaces, it returns the error message "Unable to Initialise CAD Model". Can anyone give me any advice, or has anyone been able to import flat surfaces? Or are you able to create flat surfaces within the ANSYS modeller?

Joe May 22, 2007 09:16

Re: Importing or Creating 2D Flat Surfaces into CF
 
AFAIK you cannot import isolated 2D surfaces into CFX with the geometry import function.

CFX models 2D problems as 3D problems one cell thick with appropriate symmetry BCs.

Kasper May 22, 2007 09:49

Re: Importing or Creating 2D Flat Surfaces into CF
 
It is possible to create 2D surfaces in a 3D geometry when using DesignModeler and CFX-Mesh. It is called the "Thin Surface" technique. It has certain special requirements for the model which are described in the Help section of DesignModeler. Just search for "thin surface".

/Kasper

Omer May 22, 2007 14:32

Re: Importing or Creating 2D Flat Surfaces into CF
 
As, Joe says it, you have to make a 3D geometry , one cell thick.

Design modeler can create thin surface, but that would be only useful in FEA , or else, not useful in CFX.


Kasper May 25, 2007 06:11

Re: Importing or Creating 2D Flat Surfaces into CF
 
I stick to my previous claim that it is possible to create 2D surfaces in a 3D model in DesignModeler and use this model in CFX. I've done it several times over the last months.

/Kasper

m0h March 30, 2013 12:11

Hello all,

I also used the thin surface command to create 2D surfaces in a 3D Body. My problem is that i am not albe to create a structured mesh in ANSYS Mesher. Without the thin surfaces (0 Thickness) it is possible to go for a hex mesh.

Multi Zone Does not work and with Hex Dominant method i get the following error:

http://imageshack.us/a/img404/4017/errorsmall.jpg

My model is shown in the picture below. I tried edge sizing with constant number of divisions on the outer diameter and the inner, but i always get a ted mesh.

http://imageshack.us/a/img687/9486/rotorh.jpg

Does anyone know how 2 create a structured mesh with 2D thin walls, because the model without thin walls is sweepable?

regards, Robert


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