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Effect of internal sloshing on added resistance of ship

Authors
Seo, Min-GukKim, YonghwanPark, Dong-Min
Issue Date
2월-2017
Publisher
SPRINGER
Keywords
Added resistance; sloshing; seakeeping; coupled effect; Rankine panel method
Citation
JOURNAL OF HYDRODYNAMICS, v.29, no.1, pp 13 - 26
Pages
14
Journal Title
JOURNAL OF HYDRODYNAMICS
Volume
29
Number
1
Start Page
13
End Page
26
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/8481
DOI
10.1016/S1001-6058(16)60713-8
ISSN
1001-6058
1000-4874
Abstract
The motion responses of ships carrying liquid cargo are affected not only by external wave excitation, but also by internal sloshing-induced forces and moments. Sloshing flow is coupled with the ship motion. This means the added resistance in waves may change when sloshing occurs inside the tank of the ship. In this study, the motion responses and added resistance of a ship, coupled with the sloshing-induced internal forces and moments are considered by using the linear potential theory. The three-dimensional Rankine panel method, in which the physical quantities are represented by using B-spline basis function, is applied. The sloshing flow of inner tanks is also simulated by using the Rankine panel method and linearized boundary value problem. To study the added resistance, a near-field method, which integrates the second-order pressure on a body surface, is applied. The model ship is a blunt modified Wigley model with two inner tanks. Numerical results obtained without inner tanks are compared with the experimental data, and then the effect of filling ratio of inner tanks on ship motion and added resistance are observed. The components that induce added resistance are examined, and the effects of surge motion on sloshing flow and added resistance are briefly considered. This study shows that the sloshing flow inside the inner tanks may significantly influence not only the motion responses, but also added resistance, especially, when the incident wave frequency approaches the resonance frequency of the sloshing flow.
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친환경해양개발연구본부 (심해공학연구센터)
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