Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge Converter
This paper studied the resonant behaviors of a bottom-hinged oscillating wave surge converter (OWSC) as well as the relationship of resonance with the response and capture width ratio (CWR). The time-domain dynamic equation of an OWSC in shallow water based on the boundary element method (BEM) was s...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/10/1/2 |
| _version_ | 1797492990408654848 |
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| author | Yao Liu Yong-Hwan Cho Norimi Mizutani Tomoaki Nakamura |
| author_facet | Yao Liu Yong-Hwan Cho Norimi Mizutani Tomoaki Nakamura |
| author_sort | Yao Liu |
| collection | DOAJ |
| description | This paper studied the resonant behaviors of a bottom-hinged oscillating wave surge converter (OWSC) as well as the relationship of resonance with the response and capture width ratio (CWR). The time-domain dynamic equation of an OWSC in shallow water based on the boundary element method (BEM) was solved by a Python code, considering the corrected wave surface and the nonlinearities of restoring moment, drag, and friction. The unknown factors, such as wave surface corrected factor and drag coefficient, were effectively calibrated with computational fluid dynamics (CFD) method. An intermediate initial angle in free decay is appropriate for use to determine the natural period. Under regular waves, the resonance occurs near the natural period for the uniform wave amplitude, rather than the uniform wave torque amplitude, and can disappear due to the amplification of Power Take-Off (PTO) friction. Under unit-amplitude regular waves, the period of maximum CWR is relatively close to the period of maximum velocity, but far from the resonant period. Under irregular waves, no stable resonance is observed because the maximum equivalent pitch angle appears at different peak periods of wave spectra with the variation in PTO damping. When the period of a regular wave or the peak period of an irregular wave is close to the natural period, a phase hysteresis of velocity relative to wave torque always occurs. |
| first_indexed | 2024-03-10T01:12:36Z |
| format | Article |
| id | doaj.art-d1935721c0aa450d9ed57862d18e4c04 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T01:12:36Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-d1935721c0aa450d9ed57862d18e4c042023-11-23T14:15:24ZengMDPI AGJournal of Marine Science and Engineering2077-13122021-12-01101210.3390/jmse10010002Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge ConverterYao Liu0Yong-Hwan Cho1Norimi Mizutani2Tomoaki Nakamura3Department of Civil and Environmental Engineering, Nagoya University, Nagoya 464-8603, JapanDepartment of Civil and Environmental Engineering, Nagoya University, Nagoya 464-8603, JapanDepartment of Civil and Environmental Engineering, Nagoya University, Nagoya 464-8603, JapanDepartment of Civil and Environmental Engineering, Nagoya University, Nagoya 464-8603, JapanThis paper studied the resonant behaviors of a bottom-hinged oscillating wave surge converter (OWSC) as well as the relationship of resonance with the response and capture width ratio (CWR). The time-domain dynamic equation of an OWSC in shallow water based on the boundary element method (BEM) was solved by a Python code, considering the corrected wave surface and the nonlinearities of restoring moment, drag, and friction. The unknown factors, such as wave surface corrected factor and drag coefficient, were effectively calibrated with computational fluid dynamics (CFD) method. An intermediate initial angle in free decay is appropriate for use to determine the natural period. Under regular waves, the resonance occurs near the natural period for the uniform wave amplitude, rather than the uniform wave torque amplitude, and can disappear due to the amplification of Power Take-Off (PTO) friction. Under unit-amplitude regular waves, the period of maximum CWR is relatively close to the period of maximum velocity, but far from the resonant period. Under irregular waves, no stable resonance is observed because the maximum equivalent pitch angle appears at different peak periods of wave spectra with the variation in PTO damping. When the period of a regular wave or the peak period of an irregular wave is close to the natural period, a phase hysteresis of velocity relative to wave torque always occurs.https://www.mdpi.com/2077-1312/10/1/2OWSChydrodynamicsBEMCFDresonancePTO system |
| spellingShingle | Yao Liu Yong-Hwan Cho Norimi Mizutani Tomoaki Nakamura Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge Converter Journal of Marine Science and Engineering OWSC hydrodynamics BEM CFD resonance PTO system |
| title | Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge Converter |
| title_full | Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge Converter |
| title_fullStr | Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge Converter |
| title_full_unstemmed | Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge Converter |
| title_short | Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge Converter |
| title_sort | study on the resonant behaviors of a bottom hinged oscillating wave surge converter |
| topic | OWSC hydrodynamics BEM CFD resonance PTO system |
| url | https://www.mdpi.com/2077-1312/10/1/2 |
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