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outlet boudary condition for a flow in the pipe

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Old   October 28, 2004, 07:08
Default outlet boudary condition for a flow in the pipe
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I would like to simulate the flow in a circular pipe with a turbine in the pipe. [ I did not model the streamline disturbance by the turbine, I model the turbine as the subdomain with a momentum sink] I specify the inlet boundary condition of the pipe as "Inlet" with a given x-component velocity. For an outlet boundary condition, I think I should specify "Outlet" with an x-component velocity as v2 = rho1*v1/rho2. This v2 comes from the continuity equation for 1D flow. However I saw that in the tutorial about "flow through a butterfly valve" and "flow in a catalytic converter" of CFX, they are all specified the zero relative pressure as the outlet boundary condition. 1. I was wondering about zero relative pressure that when do we use this boundary condition? Should I use it in my case? 2. In "flow in a catalytic converter", I note that it's emphasized that the outlet boundary condition must be static pressure, not average static pressure. Do anyone know why? Thank you very much.

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Old   October 31, 2004, 13:11
Default Re: outlet boudary condition for a flow in the pip
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In additon, when I set zero total pressure at the inlet of the pipe, what does it mean? When should we use this condition? Thank you.

Atit Koonsrisuk
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Old   November 9, 2004, 17:43
Default Re: outlet boudary condition for a flow in the pip
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all the boundary conditions and their meanings have been documented in the USER MANUAL. Please refer to them!!

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