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-   -   Question about outlet boundary condtion settting for transitional model (http://www.cfd-online.com/Forums/cfx/114011-question-about-outlet-boundary-condtion-settting-transitional-model.html)

Anna Tian March 3, 2013 14:45

Question about outlet boundary condtion settting for transitional model
 
Hi,

When I use the transitional model (Gamma Theta Model), I need to set up the turbulence intensity at the outlet boundary conditions. I'm confused about how do I know it before I simulate it?

Thanks!

ghorrocks March 3, 2013 17:55

You do not specify the turb intensity at outlets. Obviously the turbulence just exits the domain and plays no role in the simulation. Why do you want to specify the turbulence at the outlet?

If you change the outlet to an opening, this will allow back flow and then you will need to specify the conditions of the back flow fluid including turbulence intensity.

Anna Tian March 3, 2013 19:35

Quote:

Originally Posted by ghorrocks (Post 411227)
You do not specify the turb intensity at outlets. Obviously the turbulence just exits the domain and plays no role in the simulation. Why do you want to specify the turbulence at the outlet?

If you change the outlet to an opening, this will allow back flow and then you will need to specify the conditions of the back flow fluid including turbulence intensity.

Thank you very much! Yes. I set it as opening.


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