Lee, Chun-Ki
(Division of Navigation Science, Korea Maritime University)
,
Moon, Serng-Bae
(Division of Navigation Science, Korea Maritime University)
,
Oh, Jin-Seok
(Division of Marine Engineering, Korea Maritime University)
,
Lee, Sang-Min
(Department of Marine Science and Production, Kunsan National University)
The hydrodynamic interaction forces and moments induced by the vicinity of bank on a passing vessel are known as wall effects. In this paper, the characteristics of interaction acting on a passing vessel in the proximity of a semi-circle bank wall are described and illustrated, and the effects of sh...
The hydrodynamic interaction forces and moments induced by the vicinity of bank on a passing vessel are known as wall effects. In this paper, the characteristics of interaction acting on a passing vessel in the proximity of a semi-circle bank wall are described and illustrated, and the effects of ship velocity, water depth and the lateral distance between vessel and semi-circle bank wall are discussed. For spacing between ship and semi-circle bank wall (SP) less than about 0.2 L and depth to ship's draft ratio (h/d) less than around 2.0, the ship-bank interaction effects increase steeply as h/d decreases. However, for spacing between ship and semi-circle bank wall (SP) more than about 0.3 L, the ship-bank interaction effects increase slowly as h/d decreases, regardless of the water depth. Also, for spacing between ship and semi-circle bank wall (SP) less than about 0.2 L, the hydrodynamic interaction effects acting on large vessel increase largely as ship velocity increases. In the meantime, for spacing between ship and semi-circle bank wall ($S_P$) more than 0.3 L, the interaction effects increase slowly as ship velocity increases.
The hydrodynamic interaction forces and moments induced by the vicinity of bank on a passing vessel are known as wall effects. In this paper, the characteristics of interaction acting on a passing vessel in the proximity of a semi-circle bank wall are described and illustrated, and the effects of ship velocity, water depth and the lateral distance between vessel and semi-circle bank wall are discussed. For spacing between ship and semi-circle bank wall (SP) less than about 0.2 L and depth to ship's draft ratio (h/d) less than around 2.0, the ship-bank interaction effects increase steeply as h/d decreases. However, for spacing between ship and semi-circle bank wall (SP) more than about 0.3 L, the ship-bank interaction effects increase slowly as h/d decreases, regardless of the water depth. Also, for spacing between ship and semi-circle bank wall (SP) less than about 0.2 L, the hydrodynamic interaction effects acting on large vessel increase largely as ship velocity increases. In the meantime, for spacing between ship and semi-circle bank wall ($S_P$) more than 0.3 L, the interaction effects increase slowly as ship velocity increases.
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제안 방법
In this research, ship-bank interaction effect for the sake of reducing marine accidents in restricted waters was determined by estimating hydrodynamic force and moment between semi-circle bank wall and vessel, which is moving through limited sea area such as narrow channels. From the above numerical analysis, the following conclusions can be drawn.
성능/효과
By the calculation results from these Figs. 6 and 7, it can be inferred that similar characteristics are present qualitatively regardless of the water depth to draft ratio, but its quantitative characteristics differ; when water depth to draft ratio is less than around 2.0, ship-bank interaction effect largely increases as water depth decreases, and when the vessel passes in low speed of 2 kts and h/d is more than about 2.0, ship-bank interaction effect significantly decreases as water depth increases.
3 times of ship length, ship-bank interaction effect largely decreases. Furthermore, it can be inferred from the calculation result when the lateral distance between ship and semi-circle bank wall is about 0.5 times of ship length, ship-bank interaction effect almost disappeared.
5 times of ship length. Observing the characteristics of ship-bank wall interaction effect in these figures, its qualitative characteristics are similar in considering different lateral distances, but its quantitative characteristics differ; when the lateral distance between ship and semi-circle bank wall is less than about 0.2 times of ship length, ship-bank interaction effect sharply increases, and when lateral distance is more than about 0.3 times of ship length, ship-bank interaction effect largely decreases. Furthermore, it can be inferred from the calculation result when the lateral distance between ship and semi-circle bank wall is about 0.
Second, when moving at low speed of 2 kt near the semi-circle bank wall, the interaction effect sharply increases as the lateral distance between ship and bank decreases when the spacing between ship and bank is less than about 0.2 times of ship length, and when spacing is more than about 0.3 times of ship length, the interaction effect largely decreases as the lateral distance increases. Furthermore, when the lateral distance is about 0.
참고문헌 (14)
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