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무한수심 부유체의 부가질량계수와 감쇠계수 결정을 위한 신 방법 : 특이점 자유수면항의 유수적분
전인식(Insik Chun),오병철(Byungcheol Oh),김동하(Dong-Ha Kim),심재설(Jaeseol Shim) 한국연안방재학회 2021 한국연안방재학회지 Vol.8 No.1
It has been the case that the added mass and damping coefficients of a floating body are determined differently depending on the water depth condition which is finite or infinite. In the present study, Green functions for the finite and infinite depth conditions are compared, and a new method based on residue integration technique is proposed to determine the singular integral of the free surface term in the Green function of infinite water depth. The new method is semi-analytic in that it does not depend on any approximate transcendental functions or numerical calculations as generally appeared in the existing methods. Hence, it can be more advantageous in both accuracy and calculation time. The method is numerically implemented to a floating hemisphere. The results are compared with those of existing numerical studies, and they showed nice agreements. The depth criterion to judge whether to use finite or infinite water depth is discussed as well.
파랑관측부이의 성능예측을 위한 수치해석:동적해석(규칙파)
전인식(Insik Chun),민인기(In-Ki Min),민용침(Yongchim Min),오병철(Byungcheol Oh),심재설(Jaeseol Shim) 한국연안방재학회 2021 한국연안방재학회지 Vol.8 No.3
The prediction of the performance of a wave observation buoy is very important to acquire both in-situ security and good observation quality. In the present study, a numerical method was set up to analyze the dynamic interaction of a spherical buoy with its single point mooring line subject to regular wave conditions. The method was applied to the condition of an existing hydraulic experiment, producing results that are well compatible with experimental results within the limited accuracy of the available data. It was argued that some discrepancies between the numerical and experimental results might be due to the uncertainties of the wave exciting forces acting on the buoy and the experimental conditions of mooring line. The method was finally applied to demonstrate two practical issues related to in-situ wave height measurements; the effect of buoy size on resulting heave motion and the aspect of the numerical integration of heave acceleration to get wave profile.