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Efficient Simulation of Freak Waves in Random Oceanic Sea States |
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| Authors: | ZHANG Yun-qiu a b HU Jin-peng c ZHANG Ning-chuan d a Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou China b Key Laboratory of Renewable Energy Gas Hydrate China c School of Civil Engineering Transportation South China University of Technology Guangzhou China d State Key Laboratory of Coastal Offshore Engineering Dalian University of Technology Dalian China |
| Institution: | [1]Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China [2]Key Laboratory of Renewable Energy and Gaz Hydrate, Chinese Academy of Sciences, Guanazhou 510640, China [3]School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China [4]State Key laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China |
| Abstract: | Numerical simulations of freak wave generation are studied in random oceanic sea states described by JONSWAP spectrum.The evolution of initial random wave trains is numerically carried out within the framework of the modified fourorder nonlinear Schruedinger equation (mNLSE),and some involved influence factors are also discussed.Results show that if the sideband instability is satisfied,a random wave train may evolve into a freak wave train,and simultaneously the setting of the Phillips parameter and enhancement coefficient of JONSWAP spectrum and initial random phases is very important for the formation of freak waves.The way to increase the generation efficiency of freak waves thsough changing the involved parameters is also presented. |
| Keywords: | freak waves mNLSE sideband instability random wave JONSWAP spearum |
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