# Velocity inlet

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 November 17, 2000, 02:52 Velocity inlet #1 Max Guest   Posts: n/a i'm doing the simulation on 2 phase(water & air)flow in a horizontal pipe.which phase should i set as primary phase?why? during the setting of boundary condition, the velocity magnitude in velocity inlet is referred to the primary phase velocity or the secondary phase velocity?could anyone please help me to solve my doubt?thank you!

 November 17, 2000, 17:30 Re: Velocity inlet #2 kevin Guest   Posts: n/a According to the manual, the phase that has the lowest volume fraction must be the second phase.

 November 18, 2000, 11:24 Re: Velocity inlet #3 Max Guest   Posts: n/a kevin, then,during the setting of boundary condition, the velocity magnitude in velocity inlet is referred to the primary phase velocity or the secondary phase velocity? Max

 November 20, 2000, 12:45 Re: Velocity inlet #4 Adel Ataki Guest   Posts: n/a Hallo Max, thank you for your help. I think the problem is how to choose the inlet and the outlet boundaries! for the velocity-inlet, pressure-inlet, pressure-outlet you ought to give the Volume-Fractions for the secondary phase! for an outflow you you need to give a Flow Weighting Rate! The quistion is how does VOF model work? Best regards Adel

 November 22, 2000, 11:36 Re: Velocity inlet #5 kevin Guest   Posts: n/a Yes Max

 November 22, 2000, 12:10 Re: Velocity inlet #6 Max Guest   Posts: n/a kevin, Yes?what is your answer referred to? Max

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