Cruising performance of ships with large superstructures in heavy sea

Fujiwara, Toshifumi; Ueno, Michio; Ikeda, Yoshiho

doi:10.2534/jjasnaoe.2.257

Cited by 15 publications

(11 citation statements)

References 3 publications

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“…In the table, CS means the container ship, present results, S175 the S-175 container ship, Son and Nomoto (1981), LPS a large passenger ship, Fujiwara et al (2006), and PCC a pure car carrier, present results. CS-twin and CS-sngl mean container ships with twin propellers and a single propeller, respectively, Kim et al (2007), ONRT means ONR tumblehome ship, Araki et al (2012), FERRY is the ferry with twin propellers and twin rudders used in the present study, and H-CS denotes a container ship from Hirano and Takashina (1980).…”

Section: Discussionmentioning

confidence: 95%

Roll-Coupling Effect on Ship Maneuverability

Yasukawa

Yoshimura

2014

Ship Technology Research

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Roll-coupling effect on ship maneuvering motions is not negligible for high speed vessels, large container ships, passenger ships etc. To perceive the roll-coupling effect on the ship maneuverability, this paper proposes new simplified formulae for course stability criterion and steady turning index in the framework of the linear motion theory. Then, an approximation is employed where the depth wise acting point of lateral force related to roll moment is constant in any oblique motion mode. The course stability criterion including the roll-coupling effect C φ is written aswhere C denotes the usual course stability criterion, Y v , N v , Y φ and N φ the linear hydrodynamic derivatives and the depth wise acting point of the lateral force. The formula is simple and useful for checking the course stability taking the roll-coupling effect into account. To obtain the hydrodynamic derivatives, oblique towing test and circular motion test with various heel angles were conducted for models of a container ship, a pure car carrier and a ferry. In general, course stability deteriorates with increasing Froude number Fn or decreasing of metacentric height GM , whereas turning performance improves and the time until response reaches steady turning state increases.

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Section: Discussionmentioning

confidence: 95%

Roll-Coupling Effect on Ship Maneuverability

Yasukawa

Yoshimura

2014

Ship Technology Research

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“…So far, surface wind fields have just been used in VISIR-I.a for sailboats (Mannarini et al, 2015). Wind directly affects also motor vessels through an added aerodynamic 15 resistance and a heeling moment, which are mostly important for vessels with a large superstructure, such as passenger ships (Fujiwara et al, 2006). This will be considered for future VISIR developments.…”

Section: Windmentioning

confidence: 99%

VISIR-I.b: waves and ocean currents for energy efficient navigation

Mannarini¹,

Carelli²

2019

Preprint

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VISIR-I.b, the latest development of the ship routing model published in Mannarini et al. (2016a), is here presented.The new model version targets large ocean-going vessels by accounting for both waves and ocean currents. In order to effectively use currents in a graph-search method, new equations are derived and validated versus analytical benchmarks.A case study is computed in the Atlantic Ocean, on a route from the Chesapeake Bay to the Mediterranean Sea and vice versa.Ocean analysis fields from data-assimilative models (for both ocean state and hydrodynamics) are employed. The impact of 5 waves and ocean currents on transatlantic crossings is assessed through mapping of the spatial variability of the routes, analysis of their kinematics, distribution of the optimal voyage duration vs. its length, and impact on the Energy Efficiency Operational Indicator of the International Maritime Organization. It is distinguished between sailing with or against the main ocean current.The seasonal dependence of the savings is evaluated, indicating, for the featured case study, larger savings during the summer crossings and larger intra-monthly variability in winter. The monthly-mean savings sum up to values between 3 and 12%, 10 while the contribution of ocean currents is between 1 and 4%. Also, several other ocean routes are considered, providing a pan-Atlantic scenario assessment of the potential gains in energy efficiency from optimal tracks and linking them to regional meteo-oceanographic features.

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“…where A T is the projected transverse area above the designated load condition and C Dwind is the drag coefficient due to wind. In this study, a regression formula by Fujiwara et al 16 is adopted for the wind drag coefficient. This method uses several components in the estimation equations, which are decided by the regression analysis using extensive wind tunnel experimental data.…”

Section: Hydrodynamic Analysismentioning

confidence: 99%

Hull form optimization in the conceptual design stage considering operational efficiency in waves

Jung

Kim

2018

Proceedings of the Institution of Mechanical Engineers, Part M:

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This study focuses on the optimization of ship dimensions by considering hydrodynamic performance in waves. In actual seaways, a ship experiences speed loss due to environmental loads by waves and wind. Therefore, along with calm water resistance, speed loss in waves should be considered in the hull form design in order to improve operational efficiency in waves. However, a trade-off may be needed between total resistance on the ship and the speed loss in waves. To address this problem, Non-dominated Sorting Genetic Algorithm II, which is a multi-objective optimization method, is used to minimize the total resistance on a ship in seaways and the speed loss by additional resistance. In the optimization process, added resistance is predicted using a numerical method based on slender-body theory, Maruo's far-field formulation, and an empirical formula for added resistance in short waves. The speed loss in waves, which can be expressed by a weather factor (f w ), is estimated using power-speed curves. This article introduces some examples of the sensitivity analysis of added resistance and speed loss in waves to the variations of ship dimensions. Finally, the optimization solutions on a Pareto front set are compared to a basis ship in terms of hull form, and the corresponding hydrodynamic performances are evaluated.

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Cruising performance of ships with large superstructures in heavy sea

Cited by 15 publications

References 3 publications

Roll-Coupling Effect on Ship Maneuverability

Roll-Coupling Effect on Ship Maneuverability

VISIR-I.b: waves and ocean currents for energy efficient navigation

Hull form optimization in the conceptual design stage considering operational efficiency in waves

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