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Old   June 21, 2011, 09:15
Default Meshing in ICEM
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Faisal Durrani
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Hi guys, I have a box that has to mimic a room. Usually i would make rectangular openings and thus use hexa-structured mesh. When i would import his model into CFX-pre all the openings would be there. But now i have to make circular openings in the box. If i use the same old hexa-structured mesh CFX-pre does not read the circular openings and only imports the box with no circular openings. Can i not have circular openings and use hexa-structured mesh at the same time? Do i need to use tetra meshes?

P.S: I do convert the hexa mesh at the end into unstructured mesh by righ-clicking on "pre-mesh" in the tree and and selecting "convert to unstructured mesh".

Help plz. Thanks you guys!
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Old   June 22, 2011, 01:00
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mostly you need to associate the edges to the circular opening curves. If you can post some images will be easy to understand your problem.
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Old   June 22, 2011, 04:38
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I have just attached the pic of my geometry. The circles on the top and bottom are the openings.
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Old   June 22, 2011, 06:05
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upload some images of your blocking, the edges are turned off. Pls turn on the edges and take the image.
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Old   June 22, 2011, 08:33
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You need to split the blocking to get additional edges to work with and then associate those with the openings... You probably should also be using OGrid to get decent quality mesh in the openings...
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Old   June 23, 2011, 05:59
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OK here is the view with the blocking shown.
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Old   June 23, 2011, 06:10
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Quote:
Originally Posted by PSYMN View Post
You need to split the blocking to get additional edges to work with and then associate those with the openings... You probably should also be using OGrid to get decent quality mesh in the openings...
I have split the blocking in to additional edges as you can see in the picture i have uploaded. About association.... well i associated the closest edge of the block-splitting plane to the curve of the circular openings. And when i imported it to cfx-pre it still did not pick up the circular openings.
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Old   June 23, 2011, 06:18
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Guys i have uploaded my geometry on the following links. Could you plz open the file and see what im doing wrong that CFX-pre is not picking up the circular openings. Thanks a million you guys

http://www.gigasize.com/get/66m3g2bch7b (.prj file)
http://www.gigasize.com/get/6y2tbmkgbbb (.tin file)
http://www.gigasize.com/get/kgksdncwdtf (.uns file)
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Old   June 23, 2011, 10:26
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Scratch that.... just tell me guys, i have made openings in the geometry. I just cant get cfx-pre to recognize them. Do i need to i dont know..... associate them or something or does auto associate does it for me? I am defining each opening as a part but its still not being picked up. Help plz....
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Old   June 24, 2011, 13:08
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You don't need to send the uns file (I couldn't get it to download anyway), but the blk file would help... Just zip it and attach it in CFD-Online... It will be a small enough file...
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Old   June 27, 2011, 02:53
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you dont have to upload the .uns file. Upload the .blk file that is the bloking file.
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Old   June 27, 2011, 07:50
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Thanks you guys, the problems is solved. I was not associating the block surfaces to individual parts. Thank you every body for your kind replies
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Old   June 28, 2011, 07:23
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It should associate faces to the closest part by default... You shouldn't have to do it explicitly.
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