무한수심 부유체의 부가질량계수와 감쇠계수 결정을 위한 신 방법: 특이점 자유수면항의 유수적분 KCI

Title
무한수심 부유체의 부가질량계수와 감쇠계수 결정을 위한 신 방법: 특이점 자유수면항의 유수적분
Alternative Title
A New Method for determining Added Mass and Damping Coefficients of Floating Objects in Infinite Water Depth: Residue Integration of Singular Free Surface Term
Author(s)
전인식; 오병철; 김동하; 심재설
KIOST Author(s)
Kim, Dong Ha(김동하)Shim, Jae Seol(심재설)
Alternative Author(s)
김동하; 심재설
Publication Year
2021-01
Abstract
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.
ISSN
2288-7903
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/41366
DOI
10.20481/kscdp.2021.8.1.21
Bibliographic Citation
한국연안방재학회지, v.8, no.1, pp.21 - 27, 2021
Publisher
(사)한국연안방재학회
Keywords
floating structures; added mass coefficient; radiation damping coefficient; singularity distribution method; Green function
Type
Article
Language
Korean
Publisher
(사)한국연안방재학회
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