Unsteady RANS Simulation of a Manoeuvring Ship Hull

he computation of the ow around a surface piercing ship hull in forced planar motion is presented. The flow is simulated by the numerical solution of the unsteady RANS equations. The algorithm used for the simulation is a fully implicit finite volume scheme, which is unconditionally stable for any time step. Free surface effects are taken into account by means of a surface fitting approach. The numerical calculation of the flow around a ship hull with prescribed yaw and sway motion is reported; the simulation mimics the towing tank test in which the planar motion mechanism (PMM) is used to enforce the ship motion. The unsteady wave pattern and velocity field are shown; the dependence of the global coefficients on the simulation parameters is also dis- cussed.