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How to set the boundary condition of Pressure Outlet

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Old   April 19, 2013, 17:29
Question How to set the boundary condition of Pressure Outlet
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Yiyuan YONG
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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?
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Old   April 20, 2013, 04:06
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Esteban
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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
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Old   April 20, 2013, 09:58
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Quote:
Originally Posted by justeyong View Post
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.
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Old   April 20, 2013, 14:31
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Yiyuan YONG
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Quote:
Originally Posted by valio View Post
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
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Originally Posted by Far View Post
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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