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In this paper, drift off simulations have been performed for a full DP deep water drillship by using a time domain DP analysis software. Especially the analysis is focused on the drift off motion of a drillship from the moment of blackout until the recovery of thrusters. Two different methods of numerical simulations are applied: one is the simulation using exactly the same wave elevations measured in the model test, and the other is using random wave seeds for irregular waves to see the randomness of the drift off motion. Both simulation results are compared to the model test data and it is found that both simulation results give quite good agreement with the drift off motions of the model tests. [ABSTRACT FROM AUTHOR]

The article discusses research which designed a free surface type Anti-Rolling Tank (ART) for ultra large container ships. Topics discussed include the general arrangements of the target container ship, determining the position and solidity ratio of baffles inside the tank and use of Computational Fluid Dynamics (CFD) and Experimental Fluid Dynamics (EFD) to assess the hydrodynamic effectiveness of the ART.

The article discusses a study which assessed parametric roll phenomenon for modern container vessels using model tests and numerical analyses. The tests were conducted in the deep water towing tank of Hyundai Maritime Research Institute (HMRI) and composed of free roll decay tests in calm water, regular head wave tests and irregular head wave tests. Numerical simulations were done using an American Bureau of Shipping (ABS) seakeeping program wherein the impulse response function method is used.

The article discusses a research study which developed a new sloshing assessment method based on regular motion scenarios to assess the structural integrity of the membrane type liquefied natural gas (LNG) containment system. The generation of six-degree of freedom (DOF) regular design motion scenarios in each surge, sway, roll and pitch mode is discussed. The structural safety of the system is also examined.

The article focuses on a study which described the use of computation fluid dynamics (CFD) simulations in fully nonlinear seakeeping analysis. The wave elevation of the design waves were obtained from the inlet boundary which was modeled using a numerical wave probe. Nonlinear structural loads were successfully calculated from the CFD simulation using the user-defined field functions and Java macro. Three-dimensional bow slamming was also successfully simulated.