For wave simulation there are two main methods: 1- velocity profile (u,w) in an inlet 2- Inlet motion
Do the free surface over a bump CFX tutorial. You have to adapt the tutorial example to your case. You can describe your wave with a CEL expression or other function. If you do not know how to do this then do more tutorials to learn CEL and other general functions.
I need to get in touch with someone who did this kind of simulation (floating object in CFX) because I need some specific details in freesurface control and measurement.