Sincerelly the problem is with the ship's dynamics and its behavior.
The ship's interaction have to be well cauculated for each ship. ( A good job had been done into the SS08, So let's share the ideas and knowledge and then increase the SSE as with the best quality as possible.
Ship's interaction and Dynamic influencing on her behavior:
Simulation of ship maneouvring is usually conducted for the still water
condition. Time-domain simulation of ship motion is restricted to in-plane
motion comprising of
surge,
yaw and
sway motion components. If waves are
encounted for, their effect is taken into account as a steady state one.
In protected waters this components are well observed during ship berthing or unberthing.
The method which evaluates in time-domain ship rigid body motions in waves
and manuoeuvring is presented briefly. The so called two-stage approach
(Matusiak, 2000, Matusiak, 2001) is used when evaluating non-linear responses.
The method preserves best features of the linear seakeeping theory and takes
into account most important non-linearities. As a result the loss of ship stability
in waves and parametric resonance of roll are numerically predicted. Ship
maneouvring in regular waves can be simulated, too.
regards,
Tavares