I am simulating spray to a rotating ball use Discrete Phase Model. I set the boundary condition for the ball is a rotating wall. Before I introduce injection, I can see that the flow field is affected by the rotating. But after i indroduce injection (surface), all the droplets are all deposit on one side of the ball as the ball is stationary. I think this is because of the coordinate, the coordinate is sationary, and the position of the droplets are reported by position. I don't know if my thinking is right. I don't know what to do to solve this problem. Can anyone help me? Thanks.