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interFoam BC for open water

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Old   September 13, 2022, 06:03
Post interFoam BC for open water
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Eric Segalerba
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Hello everyone!


I'm trying to simulate the flow exiting a pipe placed around 3 meters under the sea level. The case is 2D but I'm having some problems with the boundary conditions for the "sea".


So far I set:
U
inlet -> flowRateInletVelocity
outlet -> inletOutletVelocity
p

inlet -> fixedFluxPressure
outlet -> zeroGradient
alpha
inlet -> fixedValue ... value 1

outlet -> variableHeightFlowRate


With those B.Cs the simulation diverges and I can't figure out what to change to make it works...
Do you have any guess or tip?


Thank you in advance
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Old   September 13, 2022, 20:04
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Joachim Herb
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You do not specify the pressure with your boundary conditions. Somewhere you need some kind of fixedValue boundary condition for p (or actually for p_rgh).
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Old   September 14, 2022, 06:41
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Eric Segalerba
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Hi and thank you for your quick answer! Actually after some tests I was able to make it work by splitting the outlet patch in two and imposing flowRateOutletVelocity in the water patch!
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