[csh4206]

I am setting up a VOF simulation of an open channel flow problem, and have defined two regions: water and air (both are rectangular). At the inlet, I am using velocity inlet and setting the relative concentrations (100% H20 for water region; 100% air for air region), and pressure outlet for both. I am using a flat VOF wave and defined the necessary water and air velocities, density and the H2O surface elevation at the inlet.

What type of boundary should I use for the air-water interface along the length of the channel for my boundary condition? This corresponds to the flat water surface air-water interface at the beginning of the simulation, however, the free surface will change and develop small waves during the course of the simulation because of a surface-piercing cylinder.

Thanks in advance for any input.

[ping]

you don't need two region for this so just have one region - do the vof tutorials to understand how

you can complicate the model with additional regions and the interface will be an inplace one to all flow of both air and water depending on where the free surface is

[SHAIZA TALIB]

HI, I M NEW TO FLUENT AND LEARNING VOF METHOD. I AM USING OPEN CHANNEL WAVE BC. AT THE BOTTOM I HAVE WATER 25M I M PATCHING WHEN I M INITILIZING. ON TOP 25M THERE IS AIR. WHAT I WANT TO SEE THE WIND EFFECTS USING WIND VELOCITY. IF WE WILL NOT DIVIDE THE INLET WHERE I NEED TO DEFINE VELOCITY FOR AIR REGION ITS MENTIONED IT WILL ACT ALONG X AXIX IN AIR REGION. WITHOUD WIND I CREATE THE WAVE I AM ATTACHING THE OICTURE. SO USING WIND VELOCITY THIS WAVE SHOULD INCREASE IN HEIGHT. PLEASE SENIORS CAN YOU HELP ME TO MAKE ME UNDDRSTANF HOW TO DEFINE WIND(AIR) VELOCITY IN THE MODEL.