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17 pages, 4243 KiB

Open AccessArticle

Numerical Analysis of Hydrodynamic Interactions Based on Ship Types

by Chun-Ki Lee and Su-Hyung Kim

J. Mar. Sci. Eng. 2025, 13(6), 1075; https://doi.org/10.3390/jmse13061075 - 29 May 2025

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To ensure safe navigation, ship operators must not only meet the criteria defined in the International Maritime Organization (IMO) maneuverability standards but also understand maneuvering characteristics in restricted waters. This study numerically analyzed the hydrodynamic lateral forces and yaw moments acting on a stern trawler, a container ship, and a very large crude carrier (VLCC) with different hull forms as they navigated near a semi-circular bank wall. The effects of varying bank radius, lateral clearance, and water depth were examined. The results showed that the VLCC experienced the strongest attractive lateral force, while the stern trawler exhibited the most significant yaw moment. The hydrodynamic interaction patterns of the stern trawler and container ship were similar, whereas the VLCC displayed distinct behavior due to its fuller hull and greater inertia. These findings demonstrate that hull geometry significantly influences hydrodynamic interactions near boundaries, and the degree of response varies by ship type. The results provide valuable reference data for improving navigation safety in confined waters and preventing marine accidents such as collisions and groundings. This study contributes to a better understanding of ship–bank interaction and offers a theoretical basis for maneuvering assessments of various ship types in restricted maritime environments. Full article

(This article belongs to the Special Issue Models and Simulations of Ship Manoeuvring)

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11 pages, 2468 KiB

Open AccessArticle

Analysis of Ship Noise Characteristics Generated According to Sailing Conditions of the G/T 1000-ton Stern Fishing Trawler

by Tae-ho Lee, Nam-u Lee, Dae-jae Lee and Bong-kyu Jung

J. Mar. Sci. Eng. 2021, 9(8), 914; https://doi.org/10.3390/jmse9080914 - 23 Aug 2021

Cited by 3 | Viewed by 4910

Abstract

In this study, we conducted onboard noise measurement experiments under the conditions of anchoring, sailing, casting, and hauling to determine whether noise generated in the G/T 1000-ton fishing trawler triggers zone-specific effects upon vessel operation. It was shown that most accommodation areas of the trawler comfortably met the IMO acceptance criteria regardless of the sailing condition, but most of the stern area, where the fishing actually occurs, exceeded the permitted limit of 75 dB (A). Furthermore, the statistical analysis revealed a significant difference (p < 0.05) only in the bow and the stern, which are both open areas. In the case of the former, improvements were deemed possible due to the influence of the fluid emission noise from the seawater piping in the bow, and the acceptance criteria were also appropriate. However, in the case of the latter, a significant difference was seen in hauling conditions, and on-site analysis confirmed frictional noise from hydraulic oil in the trawl winch and between the chains and the metal hull, leading to the conclusion that various improvements are required, such as the mandatory wearing of safety equipment by workers and stricter legal standards for permitted noise levels. Full article

(This article belongs to the Section Marine Biology)

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14 pages, 3001 KiB

Open AccessArticle

Estimation of Maneuverability of Fishing Vessel Considering Hull-Form Characteristics

by Su-Hyung Kim, Chun-Ki Lee and Sang-Min Lee

J. Mar. Sci. Eng. 2021, 9(6), 569; https://doi.org/10.3390/jmse9060569 - 25 May 2021

Cited by 4 | Viewed by 3101

Abstract

Fishing vessels with a length

(L_{BP})

Fishing vessels with a length

(L_{BP})

of less than 100 m are generally not required to comply with the mandatory IMO Ship Maneuverability Standards. Therefore, an analytical method using empirical formula is preferred rather than a model test, which consumes a lot of time and monetary resources in estimating the maneuverability at the design stage. However, most empirical formulas have been derived from the model test results of merchant ships, and in the process, estimation errors may occur when hull-form parameters (

L / B

C_{b} B / L

) with high correlation are applied to fishing vessel hull form whose characteristics are different from those of merchant ships. Therefore, a modified empirical formula was derived from previous research by including major parameters of fishing vessel hull form in the Kijima 90 empirical formula. In this study, maneuverability of stern trawler hull form is estimated for validating a modified empirical formula. The study confirmed that including characteristic parameters of the fishing vessel hull form in the empirical formula developed for merchant ships could improve the accuracy of estimation. Full article

(This article belongs to the Section Ocean Engineering)

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