TY - JOUR
T1 - Influences of wave resonance on hydrodynamic efficiency and loading of an OWC array under oblique waves
AU - Zhao, Xuanlie
AU - Zou, Qingping
AU - Geng, Jing
AU - Zhang, Yang
AU - Wang, Zhijie
N1 - Funding Information:
Key Program for International Scientific and Technological Innovation Cooperation between Governments ( 2019YFE0102500 ); National Natural Science Foundation of China ( 52001086 ); China Postdoctoral Science Foundation Funded Project ( 2019M661257 ).
Publisher Copyright:
© 2022
PY - 2022/3
Y1 - 2022/3
N2 - In this paper, a semi-analytical solution was derived from the linear potential flow theory using the matching eigenfunction method to investigate hydrodynamic characteristics of a rectangular oscillating water column (OWC) array under oblique waves. The theoretical results indicate that the sloshing resonance in the alongshore direction varies with the incident wave angle significantly. The presence of the along-shore sloshing resonance decreases the hydrodynamic efficiency and increases the wave reflection. The critical wavenumber kc at which the along-shore sloshing resonance occurs is identified as a key controlling factor of the performance of the OWC array. It is dependent on the chamber length in the along-shore direction. The peak efficiency occurs at the lower frequency for the larger incident wave angle. To our knowledge, this study provides the first theoretical evidence that the peak wave loading of the OWC array is triggered by the along-shore resonance under oblique wave action. Our theory confirms that the optimum coastal protection can be achieved by the peak efficiency of the OWC array in the frequency region of the piston resonance of the OWC.
AB - In this paper, a semi-analytical solution was derived from the linear potential flow theory using the matching eigenfunction method to investigate hydrodynamic characteristics of a rectangular oscillating water column (OWC) array under oblique waves. The theoretical results indicate that the sloshing resonance in the alongshore direction varies with the incident wave angle significantly. The presence of the along-shore sloshing resonance decreases the hydrodynamic efficiency and increases the wave reflection. The critical wavenumber kc at which the along-shore sloshing resonance occurs is identified as a key controlling factor of the performance of the OWC array. It is dependent on the chamber length in the along-shore direction. The peak efficiency occurs at the lower frequency for the larger incident wave angle. To our knowledge, this study provides the first theoretical evidence that the peak wave loading of the OWC array is triggered by the along-shore resonance under oblique wave action. Our theory confirms that the optimum coastal protection can be achieved by the peak efficiency of the OWC array in the frequency region of the piston resonance of the OWC.
KW - along-shore sloshing resonance
KW - hydrodynamic efficiency
KW - oscillating water column
KW - wave loading
UR - http://www.scopus.com/inward/record.url?scp=85123640197&partnerID=8YFLogxK
U2 - 10.1016/j.apor.2022.103069
DO - 10.1016/j.apor.2022.103069
M3 - Article
SN - 0141-1187
VL - 120
JO - Applied Ocean Research
JF - Applied Ocean Research
M1 - 103069
ER -