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Old   December 2, 2014, 09:22
Default atmospheric boundary condition
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Hi.

I am simulating a open channel flow. I have imposed a mass flow inlet, a pressure outlet and lateral wall. The only boundary I can't understand is the top of the channel, which is open to the external environment.

1)Which boundary condition is more appropriate? Pressure outlet with gauge pressure =0, pressure inlet, inlet vent or outflow (since the air can go out across this boundary)

2)Since it is an open channel, there is air which enters/exits the domain through the top boundary over the flowing water, avoiding overpressure or underpressure in the domain. The boundary condition in 1) is able to provide this?

thank you
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Old   December 2, 2014, 11:04
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you can try a round boundary like a dome and define as far field
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Old   December 2, 2014, 11:04
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you have to test different boundaries and see which one give you the best result
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