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-   -   How to set the boundary condition of Pressure Outlet (http://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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