Free Roll Decay Study of a Damaged Ship for CFD Validation

Among many factors to be considered for higher safety level requirements, the hull stability in intact and damaged conditions in seaway is of utmost importance. Since the assessment of the damaged stability is complicated due to the highly non-linear behavior, it is widely acknowledged that computational fluid dynamics (CFD) methods are the only viable approach. Although many research activities are being reported on the damaged stability recently, most of them are not designed for validation of CFD studies. In this study, well-designed model tests are performed to build a CFD validation database, which is essential in developing better CFD methods for the damaged stability assessment. The geometry of the damaged compartment and test conditions are determined based on preliminary CFD simulations. The damping coefficient of the model becomes large when the ship is damaged. The amplitude of roll motion is decreased more rapidly in damaged condition because the flooding water motion. Detailed description of the tests and corresponding conditions are described to constitute a CFD validation database.