Forced Heave
 

Hi,
I am finding the added mass and damping coefficient of different floating structures using the forced heave method. For that I simulated a cylinder in free surface by STARCCM+ , whose geometry is given below. I should get a force between -5 and 5N when STARCCM+ gives me a force of 30N. I deduced buoyancy force and hydrostatic force from it still not in the desirable limit.
following are the details and solvers i used for the simulation
1) implicit unsteady, VOF for free surface , K - epsilon turbulence with no DFBI and dynamic mesh . I also tried dynamic mesh (overset) and DFBI .
2) I have given velocity in the form of A SIN (wt) form under the motion tool as translation motion.
3) My CFL number is kept below 3
4) Flat wave with zero velocity for air and water. Initial conditions for velocity and pressure are given as zero.
5) slip wall for domain walls , and no slip wall for the translating body.
Attaching my simulation before the run due to constraints on data sharing.
Can somebody help to find my problem?
Thanks in advance

https://drive.google.com/file/d/1rFn...ew?usp=sharing