Reply To: AQWA – Reference point for hydrodynamics in presence of fluid tanks

[Shuangxing Du]

When there are internal tanks defined with a structure, the motions and total added mass/damping/hydrostatic stiffness matrices and generalised forces are with respect to the rigid body motions at the combined center of COG, which is defined by Equation (3.25) in 3.4.1. Local Internal Tank Axes and Combined COG.