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flow rate in vertical tube

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Old   May 26, 2004, 20:41
Default flow rate in vertical tube
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Saud
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What would be the most appropriate inlet and outlet boundary conditions for an incompressible steady state flow in a vertical tube. The flow rate is sought as part of the solution.

I tried inlet zero refernce pressure and a free fully developed oultlet condition but with no success.

Your kind response is appreciated.
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Old   May 30, 2004, 09:08
Default Re: flow rate in vertical tube
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versi
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For inlet: velocity is prescribed, pressure is extrapolated from interior, For outlet: Pressure is prescribed, velocities are extrapolated from interior. Try above BC.
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Old   May 30, 2004, 16:23
Default Re: flow rate in vertical tube
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Saud
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Versi, You Kindly responded: "For inlet: velocity is prescribed, pressure is extrapolated from interior, For outlet: Pressure is prescribed, velocities are extrapolated from interior. Try above BC."

But I thought prescibing velocity at the inlet (or exit)implies prescibing the flow rate itself for such steady state simulation. I am looking for BC's that will lead to the flow rate as an output results not as an input. What do you suggest. Thanks
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