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subcritical water flow with a waterfall at the outlet

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Old   April 21, 2015, 06:17
Default subcritical water flow with a waterfall at the outlet
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Hi everybody.

I am simulating an open channel flow, subcritical flow. At the outlet the flow has an atmospheric pressure, since it ends with a waterfall in a tank (the tank has not been simulated, so the outlet is where the channel ends). Have I to specify the gauge pressure=atmospheric pressure and stop, or also the water depth?

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Old   April 23, 2015, 21:00
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What do you mean? I suppose if it is atmospheric pressure it should stay 0 Pa gauge pressure at the outlet.

Actually the difference in the pressures of the inlet and outlet should be what you expect the pressure fall/rise to be between the inlet and outlet just to give good starting point to the solver.

So the result with pressure at inlet 40 Pa and outlet 0, and another simulation result with inlet 80 Pa and outlet 40 Pa, will I think be the same.

That is what I think, cant guarantee if what I am saying is right.
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Old   April 24, 2015, 15:41
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Hi.
Thank you for your response!
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multiphase flow, open channel flow, outlet boundary condition, subcritical flow, waterfall

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