# How to set the boundary condition of Pressure Outlet

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 April 19, 2013, 17:29 How to set the boundary condition of Pressure Outlet #1 New Member   Yiyuan YONG Join Date: Dec 2012 Posts: 3 Rep Power: 6 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?

 April 20, 2013, 04:06 #2 New Member   Esteban Join Date: Jul 2012 Posts: 13 Rep Power: 7 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

April 20, 2013, 09:58
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Sijal
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Quote:
 Originally Posted by justeyong 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.

April 20, 2013, 14:31
#4
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Yiyuan YONG
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Quote:
 Originally Posted by valio 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 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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