[nima3906m]

Dear all

I am trying to simulate a floating body in 2D. The body is a simple rectangular box and the wave is airy. To my understanding the boundary condition for the floating object should be movingWallVelocity and the mass of the object should be equal to the mass of the displaced water. However my problem starts here! when I try to change the body draft and make it lower say half of the height of the body in the water the simulation crashes. While when it is 0.8 or higher the simulation runs perfectly. I can't understand what is wrong the only thing I see is that there exist undesired pressure region under the body for low draft values! and before it crashes it seems that the body has buoyancy problem . ( Do I calculate the mass in a wrong way ? ) Does it have a meaning for the centre of mass to be at sea level?