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BC for free surface in open channel

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Old   March 18, 2010, 02:00
Default BC for free surface in open channel
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wat would be the BC for Free surface in setting up 2D straight open channel ?
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Old   March 19, 2010, 13:01
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The viscosity of a gas is usually much smaller than the viscosity of a liquid therefore you can estimate that the shear stress is zero in the boundary.
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Old   June 1, 2010, 15:54
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I am very new to Fluent and self taught so try to keep answers simple as possible.

Going along with the post two above. I have a rectangular cross section with open channel conditions.

For the BC of the inflow ( I have water and air as my fluids) do I need to do something special?
I set up Multiphase flow. Checked Gravity and Open Channel Boxes. Set up materials and the solver. After iterations and taking the display vector approach, I discovered from the velocity profile that only water was being used.
However upon further examination I believe it is combining the two fluids, instead of having the air on top and the water on the bottom. How do I separate them? (I believe this is done by specifying BC's which is why I put this reply here)

Additionally I do not know the water level, because it is dependent on flow so I am confused what to do.

Thanks in advance.
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