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-   -   How to set the boundary condition of Pressure Outlet (https://www.cfd-online.com/Forums/fluent/116471-how-set-boundary-condition-pressure-outlet.html)

 justeyong April 19, 2013 17:29

How to set the boundary condition of Pressure Outlet

Hi there,

I have a simple geometry, which is a vertical tube. I know the inlet velocity and , and the pressure at outlet.

The turbulent model is standard k-epsilon. I set the inlet as velocity inlet with values of U, P, k, and epsilon.

However, when I set the outlet boundary condition, Pressure Outlet, the only thing I know is the pressure.

My question is how to (or do I need to) set the backflow turbulent k and backflow turbulent epsilon?

 valio April 20, 2013 04:06

Hi,

Set the same values of k and e for your pressure outlet condition.

You can launch your computation, save results and launch a computation with other values of k and e and see the influence, but I think it does not really matter.

Valio

 Far April 20, 2013 09:58

Quote:
 Originally Posted by justeyong (Post 421847) Hi there, I have a simple geometry, which is a vertical tube. I know the inlet velocity and , and the pressure at outlet. The turbulent model is standard k-epsilon. I set the inlet as velocity inlet with values of U, P, k, and epsilon. However, when I set the outlet boundary condition, Pressure Outlet, the only thing I know is the pressure. My question is how to (or do I need to) set the backflow turbulent k and backflow turbulent epsilon?
These values are used only when there is reverse flow I guess. Otherwise only pressure is required at outlet.

 justeyong April 20, 2013 14:31

Quote:
 Originally Posted by valio (Post 421908) Hi, Set the same values of k and e for your pressure outlet condition. You can launch your computation, save results and launch a computation with other values of k and e and see the influence, but I think it does not really matter. Valio
Quote:
 Originally Posted by Far (Post 421945) These values are used only when there is reverse flow I guess. Otherwise only pressure is required at outlet.

Thanks very much!

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