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Journal of Korean Society of Coastal and Ocean Engineers > Volume 31(3); 2019 > Article
J Korean Soc Coast Ocean Eng 2019;31(3): 129-145. doi: https://doi.org/10.9765/KSCOE.2019.31.3.129
olaFlow 모델에 의한 불규칙파 작용하 혼성방파제-해저지반의 비선형상호작용에 관한 수치시뮬레이션
이광호1, 배주현2, 정욱진2, 최군호2, 김도삼3
1가톨릭관동대학교 에너지플랜트공학과
2한국해양대학교 대학원 토목환경공학과
3한국해양대학교 건설공학과
Numerical Simulation of Nonlinear Interaction between Composite Breakwater and Seabed under Irregular Wave Action by olaFlow Model
Kwang-Ho Lee1, Ju-Hyun Bae2, Uk Jin Jung2, Goon-Ho Choi2, Do-Sam Kim3
1Dept. of Energy and Plant Eng., Catholic Kwandong University
2Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University
3Dept. of Civil Eng., Korea Maritime and Ocean Univ., 727 Taejong-ro, Yeongdo-ku, Busan 49112, Korea
Corresponding author: Do-Sam Kim ,Tel: +82-51-410-4463, Fax: +82-51-403-0656, Email: kimds@kmou.ac.kr
Received: May 22, 2019;  Revised: June 21, 2019.  Accepted: June 24, 2019.
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ABSTRACT
For the design of composite breakwater as representative one of the coastal and harbor structures, it has been widely discussed by the researchers about the relation between the behavior of excess-pore-water pressure inside the rubble mound and seabed caused by the wave load and its structural failure. Recently, the researchers have tried to verify its relation through the numerical simulation technique. The above researches through numerical simulation have been mostly applied by the linear and nonlinear analytic methods, but there have been no researches through the numerical simulation by the strongly nonlinear mutiphase flow analytical method considering wave-breaking phenomena by VOF method and turbulence model by LES method yet. In the preceding research of this study, olaFlow model based on the mutiphase flow analytical method was applied to the nonlinear interaction analysis of regular wave-composite breakwater-seabed. Also, the same numerical techniques as preceding research are utilized for the analysis of irregular wave-composite breakwater-seabed in this study. Through this paper, it is investigated about the horizontal wave pressures, the time variations of excess-pore-water pressure and their frequency spectra, mean flow velocities, mean vorticities, mean turbulent kinetic energies and etc. around the caisson, rubble mound of the composite breakwater and seabed according to the changes of significant wave height and period. From these results, it was found that maximum nondimensional excess-pore water pressure, mean turbulent kinetic energy and mean vorticity come to be large equally on the horizontal plane in front of rubble mound, circulation of inflow around still water level and outflow around seabed is formed in front of rubble caisson.
Keywords: olaFlow model, irregular waves, composite breakwater, rubble mound, seabed, excess-pore pressure, vorticity, turbulent kinetic energy
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