This study focuses on the computation and analysis of the energy content of a wave train and the influence of nonlinear components, such as nonlinear wave profile as in Stokes wave and phased locked breathers, on the content. To this end, an overview of a state-of-the-art nonlinear Fourier analysis tools for the nonlinear Schrödinger equation is presented. Experimental measurements from a set of performance tests of the directional wave basin at Oregon State University were analyzed using this tool and the energy contents, both from the linear spectrum and nonlinear spectrum, were calculated. The deviation of the energy content from linear analysis and its relationship to the level of nonlinearity of the wave train is investigated. The Benjamin-Feir parameter presents the degree of nonlinearity of the wave train. An increasing energy deviation was observed for increasing nonlinearity of the wave field. Spatial evolution of such behavior is also investigated. It was confirmed that the significant difference from the linear energy is due to increase in the nonlinear components and the more distance the wave train could travel (without substantial dissipation) the more erratic and more significant energy deviations were observed.
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ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
June 17–22, 2018
Madrid, Spain
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5122-7
PROCEEDINGS PAPER
Energy Content Analysis of Closed Basin Wave Simulation Using Linear and Nonlinear Fourier Analysis
Ali Mohtat,
Ali Mohtat
Oregon State University, Corvallis, OR
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Solomon C. Yim,
Solomon C. Yim
Oregon State University, Corvallis, OR
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Alfred R. Osborne
Alfred R. Osborne
Nonlinear Waves Research Corporation, Alexandria, VA
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Ali Mohtat
Oregon State University, Corvallis, OR
Solomon C. Yim
Oregon State University, Corvallis, OR
Alfred R. Osborne
Nonlinear Waves Research Corporation, Alexandria, VA
Paper No:
OMAE2018-78754, V003T02A036; 11 pages
Published Online:
September 25, 2018
Citation
Mohtat, A, Yim, SC, & Osborne, AR. "Energy Content Analysis of Closed Basin Wave Simulation Using Linear and Nonlinear Fourier Analysis." Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. Volume 3: Structures, Safety, and Reliability. Madrid, Spain. June 17–22, 2018. V003T02A036. ASME. https://doi.org/10.1115/OMAE2018-78754
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