How do I use initial velocity by dynamic mesh method?
 

These days I am simulating a falling sphere that falls in to the water with initial velocity of 2.17 m/s .In this simulation we used axisymmetry geometry and also layering dynamic mesh method. Every time I set this velocity in the dynamic mesh (6 DOF) initial velocity panel (center of gravity motion) , unfortunately, after one time step, the center of gravity velocity in dynamic mesh zone panel changes to zero. and falling sphere falls with 0 m/s initial velocity. Now can some one help me to solve this problem?
Gratefully