# Can I use different turbulence model in dif zones?

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 March 5, 2006, 22:20 Can I use different turbulence model in dif zones? #1 Andy Cong Guest   Posts: n/a 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.

 March 6, 2006, 01:40 Re: Can I use different turbulence model in dif zo #2 thomas Guest   Posts: n/a 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 !

 March 6, 2006, 02:33 Re: Can I use different turbulence model in dif zo #3 Andy Cong Guest   Posts: n/a 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.

 March 6, 2006, 04:40 Re: Can I use different turbulence model in dif zo #4 Ralf Schmidt Guest   Posts: n/a 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

 March 6, 2006, 05:03 Re: Can I use different turbulence model in dif zo #5 Andy Cong Guest   Posts: n/a 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.

 March 6, 2006, 13:11 Re: Can I use different turbulence model in dif zo #6 Evan Rosenbaum Guest   Posts: n/a 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

 March 6, 2006, 20:45 Re: Can I use different turbulence model in dif zo #7 Andy Cong Guest   Posts: n/a I can not link it, Can you send it by Email? Thanks.

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