Experimental and Numerical Analysis of the Roll Decay Motion for a Patrol Boat

An experimental and numerical study of the free roll decay motion
for a vessel of the Italian Navy is presented. Experimentally
both sea trials and model scale tests have been carried out; numerical
analysis has been performed by means of unsteady RANS
simulations. The focus is on the analysis of the roll motion coefficients
(damping and period of oscillations) at different Froude
and Reynolds numbers. To this aim, experiments and numerical
simulations were carried out at different Froude and Reynolds
numbers. Sea trials were carried out on the Italian Navy ship Comandante
Bettica in the Mediterranean Sea, close to the coast
of Sicily; models experiments were performed in the towing tank
at INSEAN. Computations were carried out by means of an inhouse
unsteady RANS solver.