# 3D free surface and VOF

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 February 6, 2003, 23:48 Re: 3D free surface and VOF #2 phd_y2k2001@yahoo.com Guest   Posts: n/a Just curious, why do you need to write udf function outlet_pressure??

 February 7, 2003, 08:12 Re: 3D free surface and VOF #3 Orome Guest   Posts: n/a Well, we have a velocity inlet (water), a pressure inlet (air), a pressure outlet (water & air) and walls as boundary conditions. We want to fix the pressure at the outlet depending on hidrostatic pressure.

 February 8, 2003, 08:35 Re: 3D free surface and VOF #4 Heydari Guest   Posts: n/a I think for your problem , you can use pressure inlet condition for the whole of your domain except your wall b.c.

 February 10, 2003, 06:27 Re: 3D free surface and VOF #5 Orome Guest   Posts: n/a Maybe, but we think that it is not the poblem, because when we fix the height (and then we don't have to find it), the routine works. It fails when we try to find the position of the free surface.

 February 16, 2003, 05:32 i think u can help me #6 varshavian Guest   Posts: n/a i want to model an open channel junction i have two problem 1-i have two phases,air and water at the inlet(velocity inlet).depth of water is about 0.3m and total depth of channel is 0.5m and the rest of it is fuul of air.what is the fraction of water at the entrance and outlet?is water primary phase? 2-how can i give velocity profile at the entrance of channel to program?i have experimental data. please tell me how i can model free surface? thanks

 February 17, 2003, 13:07 Re: i think u can help me #7 Orome Guest   Posts: n/a The primary phase must be always the lighter phase (air) and then water will be the secondary phase. I don't know how to give a velocity profile at the entrance of the channel, I always give an average velocity. I am sorry ( ) In the "Boundary conditions --> Velocity inlet Zone" I fix the Volume Fraction for secondary phase (water) to 1.

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