Sloshing-harmonic equation-oscillation-Rigid body
 

Hi,

I am trying to impose a rigid body(a tank) to a harmonic oscillation. I created a field function u=- omega*amplitude*sin(omega*Time) with a view to defining it in translation velocity, however the tank is moving only to one direction, and sometimes when I increase the velocity amplitude (omega*amplitude) the tank goes to the other direction; but the distance ,which it travels, is very small in comparison with the other.
Does anyone have an answer to this?
Cheers