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http://dx.doi.org/10.9765/KSCOE.2013.25.3.128

Numerical Simulation of Irregular Airflow in OWC Wave Generation System Considering Sea Water Exchange  

Lee, Kwang Ho (Maritime & Ocean Engineering Research Institute, KIOST)
Park, Jung Hyun (Construction of revetment for dredging soil for Song-do at Busan New Port, Hyundai Engineering & Construction Co., Ltd.)
Cho, Sung (Gyeong water way business division, Korea water resources corporation)
Kim, Do Sam (Dept. of Civil Eng., Korea Maritime University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.25, no.3, 2013 , pp. 128-137 More about this Journal
Abstract
Due to the global warming and air pollution, interest in renewable energies has increased in recent years. In particular, the crisis of the depletion of fossil energy resources in the near future has accelerated the renewable energy technologies. Among the renewable energy resources, oceans covering almost three-fourths of earth's surface have an enormous amount of energy. For this reason, various approaches have been made to harness the tremendous energy potential. In order to achieve two purposes: to improve harbor water quality and to use wave energy, this study proposed a sea water exchange structure applying an Oscillating Water Column (OWC) wave generation system that utilizes the air flow velocity induced by the vertical motion of water column in the air chamber as a driving force of turbine. In particular, the airflow velocity in the air chamber was estimated from the time variations of water surface profile computed by using 3D-NIT model based on the 3-dimensional irregular numerical wave tank. The relationship of the frequency spectrums between the computed airflow velocities and the incident waves was analyzed. This study also discussed the characteristics of frequency spectrums in the air chamber according to the presence of the structure, wave deformations by the structure, and the power of the water and air flows were also investigated. It is found that the phase difference exists in the time series data of water level fluctuations and air flow in the air chamber and the air flow power is superior to the fluid flow power.
Keywords
Oscillating Water Column (OWC) wave generation system; water exchange; 3D-NIT model; airflow; water level fluctuation;
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Times Cited By KSCI : 5  (Citation Analysis)
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