Ball motion in a pipe filled with liquid
 

I would appreciate any hint in how to start a simulation of a moving sphere that has a Specific gravity greater than one and diameter of less than one tenth of the pipe diameter. I am trying to characterise the transient sphere (ball) behaviour in response to the incomprissible flow condition of, say, water. Any idea . I use gambit for the grid and the Fidap (fluent soon)solver. Thanks.