moving mesh or deformed geometry for fluid flow

Hi every body
I want to simulate the 2D problem in which a sphere moves freely through a fluid with a finite velocity and study its time dependent profile
but I can't move the sphere anyway. I used the "moving wall" boundary condition for particle walls and gave it velocity, "moving mesh", "deformed geometry" ... but when I animate the velocity the sphere becomes fixed and does not move or its shape becomes distorted(i.e. fluid profile penetrate inside the particle)
I think it is performed by "moving mesh" or "deformed geometry" but I don't know how it is.
my comsol is V.4.3
I attach a simple file with deformed geometry,but when I try to link a physics profile to it, I met with error
can you help me?
Thanks
best regards