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-   -   ICEM BC to FLUENT (http://www.cfd-online.com/Forums/cfx/26371-icem-bc-fluent.html)

Simon September 9, 2008 09:36

ICEM BC to FLUENT
 
Hello:

I have searched this forum and found the post about requiring LINE elements in order to have FLUENT recognize the BC created in ICEM. However, I still do not understand how one outputs an ICEM 11.1 mesh, with its boundary conditions, for FLUENT v6.3.

I can successfully output the mesh from ICEM to FLUENT. My problem lies with defining the boundary conditions (BC) in ICEM so that they are recognized by FLUENT. I have tried setting the BC in the ICEM Output BC window, but that does not work.

Can someone please provide me with a simple procedure? This task for a 2D quad mesh.

myron September 9, 2008 14:45

Re: ICEM BC to FLUENT
 
Make sure the curves bounding the 2D surface are placed into appropriate 'Parts' so you can specify boundary conditions on those 'Parts'. When you create the mesh - those bounding curves should translate to LINE elements in the appropriate parts. So if you don't have LINE (1D) elements separated into your desired BC groups (Parts) - that is the problem.

Simon September 9, 2008 15:43

Re: ICEM BC to FLUENT
 
Myron:

Thank you. I hear what you are saying, it is similar to the other post that I saw. However, I am not sure that I understand how to implement your explanation.

Let us imagine that I have a very simple geometry, a rectangular box from creating four curves from four points. The four curves are used to create a surface. I create part INLET using the left curve, part OUTLET using the right curve, part WALL using the top curve, and part SYM using the bottom curve. I use autoblock to mesh the surface.

If I understand you correctly, I need to return to my parts (INLET, OUTLET, WALL, and SYM) and associate them with the corresponding line elements if I want those parts to be BC's in FLUENT. Is that correct?

If the above is correct, would I turn off all geometry, turn on the mesh, and add the necessary line elements? Am I creating the line elements?

Thank you.

Simon September 9, 2008 17:08

Re: ICEM BC to FLUENT
 
Okay, this issue has been resolved. The process is indeed as I wrote above, after being prompted by Myron.

After the mesh was created and I had a good mesh quality. I turned off all geometry, leaving MESH enabled. I then added the appropriate LINES to my respective PARTS (e.g., inlet). I used the selection box, which made it very easy. I then returned to the OUTPUT tab to specify the BCs and write the .msh file. When I had FLUENT read the .msh file, all of my BC's were there.

I took the time to write what I did in hopes of helping the next person who is coming from another CFD software tandem to ICEM/FLUENT.

-Simon


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