In the present study, non-linear wave loads such as the wave drift force, wave drift damping and wave drift added mass, acting on a moored body is evaluated based on the potential theory. The body is oscillating at a low frequency under the non-linear excitation of waves. The problem of interaction between the low-frequency oscillation of the body and ambient wave fields is considered. A moving coordinate frame following the low frequency motion is adopted. Two small parameters, which measure the wave slope and the frequency of slow oscillations (compared with the wave frequency) respectively, are used in the perturbation analysis. So obtained boundary value problems for each order of potentials are solved by means of the hybrid method. The fluid domain is divided into two regions by an virtual circular cylinder surrounding the body. Different approaches, i.e. boundary element method and eigen-function expansion, are applied to these two regions. Calculated nonlinear wave loads are compared to the semi-analytical results to validate the present method.
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ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
June 12–17, 2005
Halkidiki, Greece
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
0-7918-4195-2
PROCEEDINGS PAPER
Non-Linear Wave Forces Acting on a Body of Arbitrary Shape Slowly Oscillating in Waves
Yasunori Nihei,
Yasunori Nihei
University of Tokyo, Tokyo, Japan
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Takeshi Kinoshita,
Takeshi Kinoshita
University of Tokyo, Tokyo, Japan
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Weiguang Bao
Weiguang Bao
University of Tokyo, Tokyo, Japan
Search for other works by this author on:
Yasunori Nihei
University of Tokyo, Tokyo, Japan
Takeshi Kinoshita
University of Tokyo, Tokyo, Japan
Weiguang Bao
University of Tokyo, Tokyo, Japan
Paper No:
OMAE2005-67486, pp. 973-980; 8 pages
Published Online:
November 11, 2008
Citation
Nihei, Y, Kinoshita, T, & Bao, W. "Non-Linear Wave Forces Acting on a Body of Arbitrary Shape Slowly Oscillating in Waves." Proceedings of the ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 1, Parts A and B. Halkidiki, Greece. June 12–17, 2005. pp. 973-980. ASME. https://doi.org/10.1115/OMAE2005-67486
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