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Can I use different turbulence model in dif zones?

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Old   March 5, 2006, 22:20
Default Can I use different turbulence model in dif zones?
  #1
Andy Cong
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Dears,

I have seperate the 3D model in two zones, and I want to use different turbulence models in the two zones.

Can I do this in Fluent? Or I have some mistaken idea?

Thanks.

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Old   March 6, 2006, 01:40
Default Re: Can I use different turbulence model in dif zo
  #2
thomas
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no the idea is good cause some development is made right now at fluent and other to do for example: RANS in the far field and LES close to area of interest (flow around a body for example). Th problem, is what do you use at the interface of the 2 area. If you are an expert both in Fluent and Turbulence devlpment you can do it ... good luck !

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Old   March 6, 2006, 02:33
Default Re: Can I use different turbulence model in dif zo
  #3
Andy Cong
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Thank you for your reply.

I am not very familar with both Fluent and turbulence, so do you mean that this is too difficult for me?

Thanks again.
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Old   March 6, 2006, 04:40
Default Re: Can I use different turbulence model in dif zo
  #4
Ralf Schmidt
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Hi,

you may separate your domain in two simulations, one far field with one turb. model, and a close field with another turb. model.

Then do a steady calculation for the first simulation, and take the results at the bondary to the second simulation as starting conditions.

Problem: How to calculate turb. input parameters for the second from the results of the first simulation??? Depends on turb. models... No Idea...

Hope it helps

Ralf
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Old   March 6, 2006, 05:03
Default Re: Can I use different turbulence model in dif zo
  #5
Andy Cong
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Thanks, Good idea, My thought is zone A -> zone B ->zone A. But the A-B boundary condition and B-A are difficult to define.

It may be just an idea.
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Old   March 6, 2006, 13:11
Default Re: Can I use different turbulence model in dif zo
  #6
Evan Rosenbaum
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I would swear that FLUENT has a UDF to do this in the user's sections of their website. Now I find it again. I'm not sure it is what you want, but: http://www.fluentusers.com/udf_archi...ples/UDF51.htm
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Old   March 6, 2006, 20:45
Default Re: Can I use different turbulence model in dif zo
  #7
Andy Cong
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I can not link it, Can you send it by Email?

Thanks.
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