# ICEM BC to FLUENT

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 September 9, 2008, 09:36 ICEM BC to FLUENT #1 Simon Guest   Posts: n/a 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.

 September 9, 2008, 14:45 Re: ICEM BC to FLUENT #2 myron Guest   Posts: n/a 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.

 September 9, 2008, 15:43 Re: ICEM BC to FLUENT #3 Simon Guest   Posts: n/a 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.

 September 9, 2008, 17:08 Re: ICEM BC to FLUENT #4 Simon Guest   Posts: n/a 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 hadikhayyamian and Obed like this.