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Old   July 13, 2012, 03:23
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Dear all,

I am trying to model an open channel flow (free surface flow) in a pipe.
I use the VOF wave model with a flatVofWave. The pipe with a diametre of 1.5m is partially filled with a filling ratio 25%
For the initialization and boundaries, i used the fields functions associated to the flatWave model. But at the inlet , the water surface is rising, it seems that the point on water level isn't taken into account in the model.

Has anyone done a VOF simulation using the flatofWave?

Thank you
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Old   July 13, 2012, 11:35
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Ryan Coe
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It sounds like you've already done this, but I would check to make sure the volume fraction and velocity field functions of the inlet are set properly (you can look at tutorials in the help manual as a reference for this).

Best of luck,
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Old   August 10, 2012, 18:09
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Brendan Smoker
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You probably have already solved this problem but if not, I had a similar problem previously and may be able to help you out. If your inlet is on the left in your picture then it actually looks like the fluid in your domain is going up but the fluid level at the inlet is staying constant. I had this problem when my velocity at the inlet was set to "Magnitude + Direction" rather than "Components". The "Magnitude + Direction" specification defaults to applying the velocity direction to boundary-normal. This may or may not be your issue but its with a check if you haven't solved your problem yet.

You can find the Inlet Velocity Specification at Region->Inlet Boundary->Physics Conditions->Velocity Specification.
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Old   August 16, 2012, 03:29
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I didn't solved this problem but with your advice i run an other simulation and in fact, it was the velocity at the inlet that was set to "magnitude+direction". I changed in "components" and my fluid doesn't go up.

Thank you so much Brens!
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Old   August 16, 2012, 11:55
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Glad to hear it!
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