# boundary conditions problem

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 August 14, 2007, 11:36 boundary conditions problem #1 Gui Guest   Posts: n/a Sponsored Links I have to impose the same inlet condition on a lot of openings. So I made a composite region with all of them and imposed the condition. Is it now possible to specify an additional value on just a few of the openings? I know I could do that with an expression but it's too complicated, I want to just selection the openings and specify the additional variable value. But as these openings are already part of a boundary condition, I can't. I would really appreciate help because this is the last simulation I can run, as my work has to be finished in ohne week. Thank you

 August 14, 2007, 18:07 Re: boundary conditions problem #2 Glenn Horrocks Guest   Posts: n/a Hi, Using CEL you can easily put a large number of boundary conditions together quickly as you just need to assemble a text file. Have you tried specifying with through CEL rather than the GUI? Glenn Horrocks

 August 15, 2007, 11:06 Re: boundary conditions problem #3 CycLone Guest   Posts: n/a Glenn: I think you mean CCL, not CEL. Gui: There are a few ways to do what you desire. 1. You can create individual boundary conditions on these faces, or 2. You can write a CEL expression and use the 'inside()@location' function to turn different values on or off (the inside() function returns 1 if it is at the location and zero elsewhere. For option 1, if it is a very large number of regions you could consider writing a macro using CCL and PERL. If it is only a few regions, just create the BC for one of the faces, duplicate it, then assign it to the other faces. You don't need the composite region either, you can just as easily select multiple faces in the boundary condition. -CycLone

 August 18, 2007, 07:33 Re: boundary conditions problem #4 Glenn Horrocks Guest   Posts: n/a Cyclone, You are correct, I meant CCL. Regards, Glenn

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