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Journal of Korean Society of Coastal and Ocean Engineers > Volume 30(6); 2018 > Article
J Korean Soc Coast Ocean Eng 2018;30(6): 270-285. doi: https://doi.org/10.9765/KSCOE.2018.30.6.270
olaFlow 모델에 의한 규칙파작용 하 혼성방파제-해저지반의 상호작용에 관한 수치시뮬레이션
배주현1, 이광호2, 정욱진1, 김도삼3
1한국해양대학교 대학원 토목환경공학과
2가톨릭관동대학교 에너지플랜트공학과
3한국해양대학교 건설공학과
Numerical Simulation of Interaction between Composite Breakwater and Seabed under Regular Wave Action by olaFlow Model
Ju-Hyun Bae1, Kwang-Ho Lee2, Uk Jin Jung1, Do-Sam Kim3
1Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University
2Dept. of Energy and Plant Eng., Catholic Kwandong 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: November 28, 2018;  Revised: December 15, 2018.  Accepted: December 21, 2018.
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ABSTRACT
The behavior of wave-induced pore water pressure inside the rubble mound and seabed, and the resultant structure failure are investigated, which are used in design of the composite breakwater representing the coastal and harbor structures. Numerical simulation techniques have been widely used to assess these behaviors through linear and nonlinear methods in many researches. While the combination of strongly nonlinear analytical method and turbulence model have not been applied yet, which can simulate these characteristics more accurately. In this study, olaFlow model considering the wave-breaking and turbulent phenomena is applied through VOF and LES methods, which gives more exact solution by using the multiphase flow analytical method. The verification of olaFlow model is demonstrated by comparing the experimental and numerical results for the interactions of regular waves-seabed and regular waves-composite breakwater-seabed. The characteristics of the spatial distributions of horizontal wave pressure, excess-pore-water pressure, mean flow velocity and mean vorticity on the upright caisson, and inside the rubble mound and seabed are discussed, as well as the relation between the mean distribution of vorticity size and mean turbulent kinetic energy. And the stability of composite breakwater are also discussed.
Keywords: olaFlow model, composite breakwater, rubble mound, seabed, excess pore pressure, vorticity, turbulent kinetic energy
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