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주파수 영역에서 인공감쇠기법을 활용한 복층 유체의 수치조파수조 방사 문제
민은홍(Eun-Hong Min),구원철(Weoncheol Koo) 한국해양공학회 2017 韓國海洋工學會誌 Vol.31 No.1
There are two wave modes induced by an oscillating body on the free surface of a two-layer fluid: the barotropic and baroclinic modes. To investigate the generated waves composed of two modes, a radiation problem involving a heaving rectangular body was solved in a numerical wave tank. A new artificial damping zone scheme was developed and applied in the frequency-domain analysis. The performance of this damping scheme was compared with given radiation boundary conditions for various conditions. The added mass and radiation damping coefficients for the heaving rectangular body were also calculated for various fluid-density ratios.
민은홍(Eun-Hong Min),최하윤(Ha-Yun Choi),김영규(Young-Gyu Kim),백광준(Kwang-Jun Paik),구원철(Weon-Cheol Koo) 한국해양공학회 2019 韓國海洋工學會誌 Vol.33 No.1
The sea is stratified with water that has different densities because of pressure, temperature, and salinity. When conducting studies of internal waves in the ocean, the fluid is assumed to have layers that have discrete densities. This assumption is made because it is difficult to achieve layers that exhibit gradual changes in the density of the water. In this study, we used previous studies on ocean waves and their radiation issues in the density layer fluid to investigate the characteristics of internal waves in the ocean and their radiation patterns induced by a moving body in a stratified fluid. We also studied the difference in wave radiation between the density gradient layer and the discrete density layer. We found that the wave radiation patterns depended on the velocity of the moving body and the change in the density of the water. The crest apex shift phenomenon was observed in the density gradient in the layer of fluid.
수직 진자형 파력 발전 장치의 운동성능 및 파력 추출에 관한 실험적 연구
김성재(Sung-Jae Kim),구원철(WeonCheol Koo),민은홍(Eun-Hong Min),장호윤(Hoyun Jang),윤동협(Donghyup Youn),이병성(Byeongseong Lee) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.5
The aim of this study was to experimentally investigate the hydrodynamic performance of a hemispheric wave energy converter (WEC) and its wave power takeoff. The WEC is a heaving body-type point absorber with a hydraulic-pump power take-off (PTO) system. The hydraulic PTO system consists of a hydraulic cylinder, hydraulic motor, and generator, with consideration given to the hydraulic pressure and flow rate. Two body model shapes, including the original hemisphere and a bottom-chopped hemisphere, were considered. The heave RAOs of the two models were evaluated for various body drafts. The effects of the hydraulic PTO system on the RAOs were also investigated.