An analytical weakly nonlinear model of Benjamin–Feir instability of a Stokes wave on nonuniform unidirectional current is presented. The model describes evolution of a Stokes wave and its two main sidebands propagating on a slowly-varying steady current. In contrast to the models based on versions of the cubic Schrodinger equation the current variations could be strong, which allows us to examine the blockage and consider substantial variations of the wave numbers and frequencies of interacting waves. Interaction with countercurrent accelerates the growth of sideband modes on a short spatial scale. An increase in initial wave steepness intensifies the wave energy exchange accompanied by wave breaking dissipation, results in asymmetry of sideband modes and a frequency downshift with an energy transfer jump to the lower sideband mode, and depresses the higher sideband and carrier wave. Nonlinear waves may even overpass the blocking barrier produced by strong adverse current. The frequency downshift of the energy peak is permanent and the system does not revert to its initial state. We find reasonable correspondence between the results of model simulations and available experimental results for wave interaction with blocking opposing current.
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ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2016
Busan, South Korea
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4998-9
PROCEEDINGS PAPER
Benjamin-Feir Wave Instability on the Opposite Current
Igor V. Shugan,
Igor V. Shugan
National Cheng Kung University, Tainan, Taiwan
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Hwung-Hweng Hwung,
Hwung-Hweng Hwung
National Cheng Kung University, Tainan, Taiwan
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Ray-Yeng Yang
Ray-Yeng Yang
National Cheng Kung University, Tainan, Taiwan
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Igor V. Shugan
National Cheng Kung University, Tainan, Taiwan
Hwung-Hweng Hwung
National Cheng Kung University, Tainan, Taiwan
Ray-Yeng Yang
National Cheng Kung University, Tainan, Taiwan
Paper No:
OMAE2016-54084, V007T06A101; 10 pages
Published Online:
October 18, 2016
Citation
Shugan, IV, Hwung, H, & Yang, R. "Benjamin-Feir Wave Instability on the Opposite Current." Proceedings of the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. Volume 7: Ocean Engineering. Busan, South Korea. June 19–24, 2016. V007T06A101. ASME. https://doi.org/10.1115/OMAE2016-54084
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