trying to model a water jet spray on to a rotating mesh
 

Hi friends,
I wish to model a water jet which is spraying onto a rotating mesh. i have tried using some example geometries, but i am facing divergence. I started with a cup which is rotating about an axis and a jet of water stationary at one point contionously spraying. the idea is to see how much water the cup collects.
Any idea on how to do this. I intend to use two phases, (water and air)
Thanks