Hydrodynamics of a dual-module pontoon-net floating breakwater system:Numerical simulations and prototype tests  

作　　者：Yong Cheng Chun-yan Ji Xue-kang Gu Fa-liHuo Jie Cui Zhi-Ming Yuan 

机构地区：[1]School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China [2]China ship Scientific Research Center,Wuxi 214082,China [3]Department of Naval Architecture,Ocean and Marine Engineering,University of Strathclyde,Glasgow,UK

出　　处：《Journal of Hydrodynamics》2021年第5期915-927,共13页水动力学研究与进展B辑（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52025112,51861130358 and 52111530137);supported by the State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University(Grant No.1905);the Newton Advanced Fellowships(Grant No.NAF\R1\180304)by the Royal Society.

摘　　要：Floating breakwaters with a mooring system have been widely applied to protect marine infrastructures(e.g.,artificial beach or island,aquaculture farm or marine vessels in harbors)from being destroyed by severe waves.In this paper,an innovative cylindrical dual pontoon-net floating breakwater was developed to enhance the wave attenuation capacity.This dual-module floating breakwater system was constructed as the prototype for on-site testing.A fully nonlinear time-domain model based on the coupled iterative solutions of the fluid integral equation and the pontoon-net dynamic equations was proposed to simulate the interactions between waves and the floating breakwater system.The flow field around the nets was simulated by introducing a porous-media model with Darcy’s law,while the deformation of the flexible nets was solved by using the lumped mass model.The instantaneous free surface was captured using the mixed Eulerian-Lagrangian(MEL)approach which employs an improved moving-grid technique based on the spring analysis to re-mesh the instantaneous water surface and the body wetted surface.On-site tests were also conducted to evaluate wave transmission performance of the floating breakwater system and to validate the numerical model.The comparisons show that the numerical solutions are in good agreement with the measured data.The effects of incident wave direction,wave period,wave height,net height,net number and net porosity on the hydrodynamic performance of the floating breakwater system were emphatically examined.

关 键 词：Floating breakwater fully nonlinear simulations on-site tests flexible net wave attenuation moving-grid technique 

分 类 号：TV13[水利工程—水力学及河流动力学]