Study on Evaluation of Wave Added Resistance for Safe Return to Port of Large Cruise Ships
The design and evaluation of a safe return to port(SRtP)system is one of the key technologies in the development of a large cruise ship.Regulations require that,after a single propeller fails,the remaining propulsion system should be capable of propelling the ship at the speed of no less than 6 knots under sea conditions with Beaufort force 8 level winds,where the wave-added resistance is an important component in the total hull resistance.A large cruise ship with nearly 150,000 gross tonnages is selected and tank model tests for the wave-added resistance are conducted under the speed of 6 knots and head sea condition,and numerical calculations based on the 3D potential flow theory at the same condition are carried out as well.Comparison of the numerical calculation with the model test shows that their trends of the wave-added resistance and the RAO of the sample ship are consistent,and the difference in the total resistance is not more than 3.6％after wind-added resistance is taken into account.It is verified that the numerical calculation method is acceptable to predict wave-added resistance for large cruise ships under SRtP conditions.
safe return to portlarge cruise shipswave added resistancemodel testnumerical calculation
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