| LIU Zanqiang,ZHANG Ningchuan,YU Yuxiu. 2011. An efficient focusing model for generation of freak waves. Acta Oceanologica Sinica, (6):19－26 |
| An efficient focusing model for generation of freak waves |
| An efficient focusing model for generation of freak waves |
| Received:April 13, 2010 Revised:April 11, 2011 |
| DOI：10.1007/s13131-011-0157-9 |
| Key words:Longuet-Higgins wave model modified phase modulation method freak waves wave focusing |
| 中文关键词: Longuet-Higgins wave model modified phase modulation method freak waves wave focusing |
| 基金项目:The Key Technology Program, the Ministry of Education of China under contract No. 104061. |
| Author Name | Affiliation | E-mail | | LIU Zanqiang | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China | liuzanqiang@163.com | | ZHANG Ningchuan | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China | | | YU Yuxiu | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China | |
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| Abstract: |
| Based on the Longuet-Higgins wave model theory, the previews studies have shown that freak waves can be generated in finite space and time successfully. However, as to generating high nonlinear freak waves, the simulation results will be unrealistic. Therefore, a modified phase modulation method for simulating high nonlinear freak waves was developed. The surface elevations of some wave components at certain time and place are positive by modulating the corresponding random initial phases, then the total surface elevation at the focused point is enhanced and furthermore a freak wave event is generated. The new method can not only make the freak wave occur at certain time and place, but also make the simulated wave surface time series satisfy statistical properties of the realistic sea state and keep identical with the target wave spectrum. This numerical approach is of good precision and high efficiency by the comparisons of the simulated freak waves and the recorded freak waves. |
| 中文摘要: |
| Based on the Longuet-Higgins wave model theory, the previews studies have shown that freak waves can be generated in finite space and time successfully. However, as to generating high nonlinear freak waves, the simulation results will be unrealistic. Therefore, a modified phase modulation method for simulating high nonlinear freak waves was developed. The surface elevations of some wave components at certain time and place are positive by modulating the corresponding random initial phases, then the total surface elevation at the focused point is enhanced and furthermore a freak wave event is generated. The new method can not only make the freak wave occur at certain time and place, but also make the simulated wave surface time series satisfy statistical properties of the realistic sea state and keep identical with the target wave spectrum. This numerical approach is of good precision and high efficiency by the comparisons of the simulated freak waves and the recorded freak waves. |
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