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symmetry boundary condition in fluent

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Old   April 12, 2010, 02:54
Default symmetry boundary condition in fluent
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Vahid Memar
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Hi
I want analysis a 3D fan in fluent but I want to model only one of two blades(the fan has two blade) , but when I use symmetry boundary condition, the solution does not converge. and I think it is logic because in fan we do not have symmetry condition , rather we have rotation axis , but in 3D we can not use axis condition. is any body can help me ?
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Old   April 12, 2010, 07:16
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As you already realized, there is no symmetry condition for your given flow problem. Maybe a rotationally periodical boundary condition can be utilized to reduce the computational domain to a 180 segment?
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Old   April 12, 2010, 07:57
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How can do rotationally periodical boundary condition on my problem ?
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Old   April 12, 2010, 09:26
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It depends on the periodicity of your actual geometry and flow field. Have a look at the UserGuid chapter 7.15 whether periodic bc are applicable for your problem. If so, you have to obey some rules when generating the mesh in gambit (mesh hardlink).

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Old   April 14, 2010, 03:45
Default Fluent Err
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Vahid Memar
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Hi Cogline
I do hardlink mesh and after that exported mesh, but when I import in fluent , we have an Error , can you guess what is the problem ?
you can receive mesh file and gambit file(dbs) from below link.
http://ifile.it/voabcxt/Gambit.rar
thanks
Memar

Last edited by v_h_memar; April 14, 2010 at 04:11. Reason: Attaching file
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Old   April 14, 2010, 04:06
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Which error?
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Old   April 14, 2010, 04:13
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Quote:
Originally Posted by coglione View Post
Which error?
can you download file from bellow link ?
http://ifile.it/voabcxt/Gambit.rar
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Old   August 30, 2012, 09:08
Default boundary condition (symmetry vs periodic doubt)
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Dear friends,
i am doing 3D wing analysis, i have doubt on boundary conditions in fluent ie both symmetry and periodic, anybody have the answer please let me know briefly,for what kind of purpose to use symmetry & periodic boundary conditions, please tell any example with problem.
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