Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Numerical Analysis on Wave Characteristics around Submerged Breakwater in Wave and Current Coexisting Field by OLAFOAM

파-흐름 공존장내 잠제 주변에서 OLAFOAM에 의한 파랑특성의 수치해석

  • Lee, Kwang-Ho (Dept. of Energy and Plant Eng., Catholic Kwandong University) ;
  • Bae, Ju-Hyun (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University) ;
  • An, Sung-Wook (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University) ;
  • Kim, Do-Sam (Dept. of Civil Eng., Korea Maritime and Ocean Univ.) ;
  • Bae, Kee Seung (Dept. of Civil Eng., Gyeongsang University)
  • 이광호 (가톨릭관동대학교 에너지플랜트공학과) ;
  • 배주현 (한국해양대학교 대학원 토목환경공학과) ;
  • 안성욱 (한국해양대학교 대학원 토목환경공학과) ;
  • 김도삼 (한국해양대학교 건설공학과) ;
  • 배기성 (경상대학교 해양토목공학과)
  • Received : 2016.11.14
  • Accepted : 2016.12.15
  • Published : 2016.12.31
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Abstract

OLAFOAM is the powerful CFD code and is an expanded version of $OpenFOAM^{(R)}$, for wave mechanics simulation. The $OpenFOAM^{(R)}$ does provide many solvers to correspond to each object of the numerical calculation in a variety of fields. OLAFOAM's governing equation bases on VARANS (Volume-Averaged Reynolds-Averaged Navier-Stokes) equation, and the finite volume method is applied to numerical techniques. The program is coded in C++ and run on the Linux operating system. First of all, in this study, OLAFOAM was validated for 1) wave transformation inside porous structure under bore and regular wave conditions, 2) wave transformation by submerged breakwater under regular wave condition, and 3) regular wave transformation and resultant vertical velocity distribution under current by comparison with existing laboratory measurements. Hereafter, this study, which is almost no examination carried out until now, analyzed closely variation characteristics of water surface level, wave height, frequency spectrum, breaking waves, averaged velocity and turbulent kinetic energy around porous submerged breakwater in the wave and current coexisting field for the case of permeable or impermeable rear beach. It was revealed that the wave height fluctuation according to current direction(following or opposing) was closely related to the turbulent kinetic energy, and others.

OLAFOAM은 파동역학의 시뮬레이션을 위하여 $OpenFOAM^{(R)}$을 확장한 강력한 CFD코드이며, $OpenFOAM^{(R)}$은 다양한 분야에서 각각 수치계산의 목적에 대응할 수 있도록 많은 Solver를 제공하고 있다. OLAFOAM의 기본방정식은 VARANS식에 기초하고, 수치기법으로는 유한체적법을 적용하며, 프로그램은 C++로 코딩되어 Linux운영체제에서 실행된다. 본 연구는 OLAFOAM을 이용하여 먼저 1) 단파와 규칙파하 투과성구조물에서 파의 변형, 2) 규칙파하 잠제에 의한 파의 변형 및 3) 흐름하 규칙파의 변형과 연직유속분포에 대해 기존의 각 실험결과와 비교 검토하여 OLAFOAM의 타당성을 검증하였다. 이로부터 지금까지 거의 검토되지 않은 규칙파와 흐름의 공존장에 설치된 투과성잠제에 대해 배후경사면을 불투과성 혹은 투과성으로 고려한 경우 흐름방향 등의 변화에 따른 잠제 주변에서 수위, 파고, 주파수스펙트럼, 쇄파, 평균유속 및 난류운동에너지 등의 변동특성을 면밀히 검토하였다. 결과로부터 흐름방향(순방향과 역방향)에 따른 파고변화는 난류운동에너지와 밀접한 관계를 가지는 것 등을 알 수 있었다.

Keywords

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