VOF Model?

Adel Ataki

Hallo all, I am a new user of FLUENT and need an argent help. my project is a simulation of two phase flow in an equaterial cross section inclined channel. The two phases (Liquid and Gas) are introduced to the channel in a countercurrent modus. The two phases are in contact from the inlet to the outlet (interface area is needed) allI what I know are the gas velocity at the gas-inlet and the liquid velocity at the liquid inlet. Operating conditions are the ambient conditions. I use VOF model, unsteady flow to simulate this problem. My quistions are: 1-What kind of boundary conditions should I choose to solve this problem? 2- if I use the following (what I am trying now): channel inlet (top) - velocity inlet for the liquid with definite inlet-area. -pressure-outlet for the gas the rest of the inlet-area. channel outlet (bottom) -velocity inlet for the gas with a geussed area -outflow for the liquid with a guessed area. Which value shall I give for the Flow Weighting Rate? I have here two phases with two outlets! Is FWR defined here for one phase or for the two pheses? Were shall I define the pressure reference to get a gas flow at the outlet? 3- Waht are the creterions whch say me that the solutions are OK? 4- Does anybody know how can I save Counters ( for Velocity Vectors for example) during the solution under batch betrieb every few time steps?

Thanks for all Adel Ataki