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Journal of Korean Society of Coastal and Ocean Engineers > Volume 32(6); 2020 > Article
J Korean Soc Coast Ocean Eng 2020;32(6): 531-552. doi: https://doi.org/10.9765/KSCOE.2020.32.6.531
혼성방파제 케이슨에 작용하는 파압과 선단 주변에서 파랑특성에 관한 수치모의(일방향불규칙파에 대해)
전재형1, 최군호2, 이광호3, 김도삼4
1한국해양대학교 대학원 토목환경공학과 대학원 박사과정
2한국해양대학교 대학원 토목환경공학과 대학원 석사과정
3가톨릭관동대학교 토목공학과 부교수
4한국해양대학교 건설공학과 교수
Numerical Simulation of Wave Pressure Acting on Caisson and Wave Characteristics near Tip of Composite Breakwater (for One Directional Irregular Waves)
Jae-Hyoung Jun1, Goon-Ho Choi2, Kwang-Ho Lee3, Do-Sam Kim4
1Ph.D. Candidate, Department of Civil and Environmental Engineering, Korea Maritime and Ocean University
2Master Course, Department of Civil and Environmental Engineering, Korea Maritime and Ocean University
3Associate Professor, Dept. of Civil Eng., Catholic Kwandong University
4Professor, Dept. of Civil Eng., Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-ku, Busan 49112, Korea
Corresponding author: Do-Sam Kim ,Tel: +82-51-410-4463, Email: kimds@kmou.ac.kr
Received: November 20, 2020;  Revised: December 10, 2020.  Accepted: December 18, 2020.
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ABSTRACT
In the previous study, both the wave characteristics at the tip of composite breakwater and on caisson were investigated by applying olaFlow numerical model of three-dimensional regular waves. In this paper, the same numerical model and layout/shape of composite breakwater as applied the previous study under the action of one directional irregular waves were used to analyze two and three-dimensional spatial change of wave force including the impulsive breaking wave pressure applied to trunk of breakwater, the effect of rear region, and the occurrence of diffracted waves at the tip of caisson located on the high crested rubble mound. In addition, the frequency spectrum, mean significant wave height, mean horizontal velocity, and mean turbulent kinetic energy through the numerical analysis were studied. In conclusion, the larger wave pressure occurs at the front wall of caisson around the still water level than the original design conditions when it generates the shock-crushing wave pressure in three-dimensional analysis condition. Which was not occurred by two-dimensional analysis. Furthermore, it was confirmed that the wave pressure distribution at the caisson changes along the length of breakwater when the same significant incident wave was applied to the caisson. Although there is difference in magnitude, but its variation shows the similar tendency with the case of previous study.
Keywords: three dimensional-numerical analysis, irregular waves, olaFlow model, composite breakwater, diffracted waves, impulsive breaking wave pressure, mean wave height, mean horizontal velocity, mean turbulent kinetic energy
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