boundary problem
 

Hello, everyone!

I want to simulate the flow in the channel, but I don't know how to difine the free surface upside in FLUENT boundary condition. What I need is 'free slip wall' (in CFX I can find it, but I should use fluent), but I didn't find it in the 'boundary condition box'. could anyone tell me how to deal with it?

use 'stationary wall' or 'moving wall'?:confused:


Thanks!