In this study, a free surface type Anti-Rolling Tank (ART) is designed for ultra large container ships. The location and dimension of the tank are determined considering general arrangements of the target container ship. Also the number, position and solidity ratio of baffles inside the tank are determined following existing recommendations. Two kinds of internal baffles are considered and their effectiveness is compared. Both Computational Fluid Dynamics (CFD) and Experimental Fluid Dynamics (EFD) approaches are used to assess the hydrodynamic effectiveness of the ART on roll motions. The analysis results such as amplitude and phase of tank moment and roll RAO are compared in depth. Throughout the assessments, the designed free surface type antirolling tanks reduced the maximum roll RAO of the target ultra large container ship by about 40%.

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