The present study is concerned with the numerical and experimental analysis of a moonpool in rough sea. From hydrodynamic viewpoint, a moonpool of drill ships can cause various problems. Among them, two major problems arise such as an increased resistance and overflow on the deck due to pumping up phenomena. To overcome these inherit problems, we have carried out various numerical analysis to find optimum moonpool shapes. The three-dimensional numerical model adopting SOLA-VOF scheme is used to predict violent free surface movement inside of a moonpool due to irregular ship motions with six degree of freedom. For accurate input data of ship motions, a three dimensional panel method program is applied for seakeeping analysis. The resistance and seakeeping model test have been carried out at MARINE to validate the proposed moonpool shapes, which have been designed based on numerical simulation results.

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