Viscous, turbulent and free surface effects of the fluid flow together with the flow-induced ship motion are simultaneously considered by a single program solving the Reynolds-Averaged Navier-Stokes (RANS) Equations and body dynamics equations. The finite-volume method used in the flow solver employs moving-grids or overlapping grids to realize the instant position of the body motion. The computation of ship motion is coupled with the flow solver at each outer iteration via its user-coding interface. To demonstrate the capability of the method in its applications to seakeeping and manoeuvring, the motion of a fast conventional passenger ferry is computed subjected to waves, showing good agreement with experiments. With a geometrically modelled rudder and a body-force simulated propeller, a turning-circle manoeuvre is performed for a container ship, producing reasonable yaw rate, flow field and wave pattern.
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