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Green water loading on a floating structure with degree of freedom effects

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Abstract

The aim of the present work is to investigate whether the degree of freedom (DOF) of a floating body has a notable effect on the maximum impact pressure due to green water on deck. The analysis is carried out for a box-shaped floating structure with a deckhouse, using experimental and numerical means to model the green water load. Green water on deck and impact on the deckhouse is generated by the impingement of a focusing wave group on a floating structure. Computations are performed using a two-dimensional constrained interpolation profile-based model solving the Navier–Stokes (N–S) equations with free surface boundary condition to deal with nonlinear water–structure interactions. The free surface is captured by a volume of fluid (VOF)-type tangent of hyperbola for interface capturing/slope weighting (THINC/SW), which is more accurate than the original THINC scheme. The verifications of the simulation through a series of model-to-model comparisons are performed in a two-dimensional glass-wall wave tank. Experimental water surface elevations, body motions and impact pressure are compared satisfactorily with the computed results for different DOFs cases. As a result, the peak impact pressure due to green water decreases rapidly with the increasing DOF.

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Acknowledgments

The laboratory experiments of this study were performed during the author’s visit to RIAM at Kyushu University. Financial support from Kyushu University for the author is gratefully acknowledged. Special Acknowledgments should be given to Dr Changhong Hu. This work is jointly supported by the Fundamental Research Funds for the Central Universities (2012QNA4020), the National Natural Science Foundation of China (No. 51209184), Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province (Grant no. 2013SS03), and the Zhejiang Open Foundation of the Most Important Subjects.

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Authors and Affiliations

  1. Ocean College, Zhejiang University, Hangzhou, 310058, China

    Xizeng Zhao, Zhouteng Ye & Yingnan Fu

  2. State Key Laboratory of Satellite Ocean Environment Dynamics, The Second Institute of Oceanography, Hangzhou, 310012, China

    Xizeng Zhao

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  1. Xizeng Zhao
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  2. Zhouteng Ye
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  3. Yingnan Fu
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Correspondence to Xizeng Zhao.

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Zhao, X., Ye, Z. & Fu, Y. Green water loading on a floating structure with degree of freedom effects. J Mar Sci Technol 19, 302–313 (2014). https://doi.org/10.1007/s00773-013-0249-7

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  • DOI: https://doi.org/10.1007/s00773-013-0249-7

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