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OpenFOAM을 이용한 편심 원형실린더 파력발전장치의 비선형 운동해석
고행식(H.S. Ko),조일형(I.H. Cho),배윤혁(Y.H. Bae) 한국전산유체공학회 2018 한국전산유체공학회지 Vol.23 No.3
In this study, the numerical simulation with OpenFOAM, an open source library in Computational Fluid Dynamics(CFD), is conducted for analyzing a non-linear dynamic behavior of an eccentrical cylinder-type Wave Energy Converter(WEC) in wave field. Two optimal eccentrical cylinder-type WECs constrained in single degree of freedom(pitch) are analyzed with interDyMFoam which solves the Reynolds-Averaged Navier-Stokes(RANS) and deals with dynamic mesh. In addition, Arbitrary Mesh Interface(AMI) is employed to prevent the mesh from being distorted. Numerical results of free decay tests and dynamic behaviors with different wave heights and periods are compared with model-scale experimental results. A larger scale study is also performed. Pitch Response Amplitude Operator(RAO)s with a lower and a higher wave height are compared and non-linear dynamic behaviors are obviously investigated by spectrum analysis. The results show that higher order pitch harmonic motions are grown or added according as wave height is increased. Therefore, RAO with a higher wave height is smaller than a lower wave height due to the non-linear effect.
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고행식(H.S. Ko),배윤혁(Y.H. Bae),조일형(I.H. Cho) 한국전산유체공학회 2018 한국전산유체공학회지 Vol.23 No.1
In this study, the numerical simulation with OpenFOAM, an open source library in Computational Fluid Dynamics(CFD), to analyze a dynamic behavior of a floating structure in wave field is carried out. The two-dimensional numerical wave tank with a simple rectangular floating body constrained in two degree of freedom(heave and pitch) is modelled. “interDyMFoam” which solves the Reynolds-Averaged Navier-Stokes(RANS) for two incompressible phase using Volume Of Fluid(VOF) technique and dynamic mesh method for the floating body is used. Comparisons of free decay tests and heave and pitch Response Amplitude Operators (RAOs) have been made using existing experimental data performed with two dimensional wave flume in Jeju National University. Moreover, velocity field and vorticity near the floating body show how viscous damping is affected on the dynamic behavior. The results shows that the numerical wave tank with OpenFOAM can be used for the behavior analysis of the floating structure.
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김남형(N.H. Kim),김향혜(H.H. Kang),고행식(H.S. Ko),문지원(J.W. Mun),권혁민(H. M. Kwon) 한국해양환경·에너지학회 2007 한국해양환경·에너지학회 학술대회논문집 Vol.2007 No.-
이호 해수욕장의 계절별 지형변동의 현지관측을 통하여 해수욕장의 침식과 퇴적이 어떻게 진행되는가를 알아보려고 시도한 것이다. 현지관측은 계절별로 1회씩 수행하였다. 그리고 현지 측량으로 얻어진 결과를 이용하여 해안선 변화와 각 관측 지점에서의 침식과 퇴적의 이력을 통하여 연간 지형변동을 확인할 수가 있었다. 현지관측에 의한 제주 이호 해수욕장의 해안선은 겨울철에 전진하고 여름철에는 후퇴하는 경향을 해안선의 계절별 변화를 통하여 알 수 있었다. 지형변동 이력을 보다 정확하게 이해하기 위해서는 월별로 현지 관측을 수행하는 것이 좋은 듯하다. This field survey is tried to know how to arise the erosion and accretion of sand beach through the field survey of seasonal topography process in Iho beach. Field survey is carried out once a season. And, using the results obtained by field survey, annual topography process can be confirmed through the shoreline changes and the records of erosion and accretion at each surveying point. By the field survey, the shoreline of Iho beach has a tendency both advance in the winter and recession in the summer. In order to more understand about the records of topography process, field survey is good to be conducted every month.
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