Numerical analysis and validation of weakly nonlinear ship motions and structural loads on a modern containership |
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| Authors: | Myung-Jae Song Kyong-Hwan Kim |
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| Institution: | a Daewoo Shipbuilding & Marine Engineering Co., Ship and Ocean R&D Institute, Geoje, Republic of Korea
b Department of Naval Architecture and Ocean Engineering, Seoul National University, 599 Gwanak-Ro, Gwanak-Gu, Seoul 151-744, Republic of Korea |
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| Abstract: | This paper aims to validate a numerical seakeeping code based on a 3D Rankine panel method by comparing its results with experimental data. Particularly, the motion response and hull-girder loads on a real modern ship, a 6500 TEU containership, are considered in this validation study. The method of solution is a 3D Rankine panel method which adopts B-spline basis function in the time domain. The numerical code is based on the weakly nonlinear scheme which considers nonlinear Froude-Krylov and restoring forces. The main focus of this study is given to investigate the nonlinear characteristics of wave-induced loads, and to validate this present scheme for industrial use in the range of low Froude number. The comparisons show that the nonlinear motions and hull-girder loads, computed by the present numerical code, have good overall agreements with experimental results. It is found that, for the better accuracy of computational results, particularly at extreme waves in oblique seas, the careful treatment of soft-spring (or compatible) system is recommended to the control of non-restoring motions such as surge, sway, and yaw. |
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| Keywords: | Seakeeping analysis Time-domain approach Rankine panel method Nonlinear ship structural loads Weakly nonlinear analysis |
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