# ICEM－2D－Blocking Problem

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 May 7, 2008, 11:41 ICEM－2D－Blocking Problem #1 Jaloha Guest   Posts: n/a Hi,every 1. I got a problem in a seemingly easy 2D case in ICEM10.0. To make it easy, let's say, we draw a geometry with a size 100*200(x*y) rectangle and a 1/4 circle with a radius of 25,and a thickness of 5 inside it. I don't know how to make the blocking since the 1/4 circle is not a squre shape and is hard to get a high quality. Do you guys have any good advice, I really want to hear that,thanks! (Maybe you will find it difficult to understand the case, and if it is true, I think a picture will make it clear,due to time reason,tomorrow I will post it on some website that you can refer to)

 May 7, 2008, 12:44 Re: ICEM－2D－Blocking Problem #2 Andrew Guest   Posts: n/a Use an O-grid around the circle. That's what o-grids are for.

 May 7, 2008, 23:45 Re: ICEM－2D－Blocking Problem #3 Jaloha Guest   Posts: n/a Hi,Andrew，Thank you for your suggestion. To make it easy to understand,I have put the picture on the Web,and here is the link: http://www.sigmirror.com/files/1925_hilyj/ICEM%EF%BC%8D2D%EF%BC%8DBlocking.bmp However,as far as I know,before creating an O-grid, I have to associate the vertices to the corresponding geometry first, dont I? In my case, if I associate the four vertices to the 1/4 concentric circle ends,the edges around it will be twisted heavily,which is not good for creating a high quality mesh. By the way, it's just a simplified case for the real one.In the practical case,I got over ten baffles(all 1/4 concentric circle shaped) hanging inside the ducts,which is much more complex. I think it should not be a tough case, and I want to sovle it as soon as possible.I want to hear your advice,thanks again.

 May 8, 2008, 10:34 Re: ICEM－2D－Blocking Problem #4 myron Guest   Posts: n/a You should probably go through the Blocking tutorials...

 May 8, 2008, 11:44 Re: ICEM－2D－Blocking Problem #5 Jaloha Guest   Posts: n/a Hi, thanks for your Thanks for your reply.I've created an O-grid,but it does not seem very ok. here is the link:http://www.sigmirror.com/files/1926_...%BC%8Dgrid.bmp Hope you can give me some advice.Thank you.

 May 8, 2008, 14:39 Re: ICEM－2D－Blocking Problem #6 Juan Catelén Guest   Posts: n/a If you send me the geometry to my email, I'll do it fast. Bye.

 May 8, 2008, 20:01 Re: ICEM－2D－Blocking Problem #7 Andrew Guest   Posts: n/a Depending on what faces, edges, and blocks you select when making an o-grid, different grids will be formed. What you need for that case is a "L" shaped o-grid. To get that shape you should select 2 sides of a block instead of the block itself. There are 3 kinds of ogrids that can be created in 2D, L, C, and O.

 May 12, 2008, 10:39 Re: ICEM－2D－Blocking Problem #8 Jaloha Guest   Posts: n/a Hi, Juan and Andrew,Thanks very much for your reply. I'm sorry that I've been away for about a week. To:Andrew I dont quite understand you by saying "To get that shape you should select 2 sides of a block instead of the block itself". Since I've ever referred to the ICEM help on 2D blocking, which creates quad mesh with the L-shap method. Thus, I got an inspiration of using that method to solve my problem, just as the same you have suggested. But it didn't work out very well. Since a teacher told me it's a kind of meaningless by setting the problem as a 2D case, and he suggested I set the problem directly as a 3D case. I think I should take his advice. However,Now, I got the similar problem when creating the 3D-case for the same problem. For convenience, I have put a picture of it on the web, and here is the link: http://www.sigmirror.com/files/1940_uy7ya/Baffle%20Blocking.bmp if you have any good advice, please tell me,thanks for all your help. By the way, if you want to take a closer look at my problem and want to see exactly the geometry(.tin) file and the blocking(.blk) file I've done, I can send a copy to you by Email, just let me know.

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