A numerical study on the added resistance and motion of a ship in bow quartering waves using a soft spring system

Cho, Jun-Hui; Lee, Soon-Hyun; Oh, Dohan; Paik, Kwang-Jun

doi:10.1016/j.oceaneng.2023.114620

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…An evaluation of the resistance of a tanker during beam seas was conducted in [8]. Through simulation, the maximum and minimum wave angles were identified, at which the additional resistance reached its maximum and minimum values.…”

Section: Introductionmentioning

confidence: 99%

Retrofitting the Bow of a General Cargo Vessel Andevaluating Energy Efficiency Operational Index

Denev

2023

Polish Maritime Research

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This report examines the feasibility and impact of retrofitting the bulbous bow on a general cargo ship, in terms of the energy efficiency operational index (EEOI), in the areas of Western Europe and the Eastern Mediterranean. Three ship forms were developed and analysed: with a bulbous bow, without a bulbous bow, and with a modified bulbous bow. The goal in developing the ship forms and conducting the analysis was to achieve minimal differences in the ship’s characteristics with the same volumetric displacement, aided by PolyCAD software. A route was selected between two ports: Varna and Rotterdam. The labour intensity of the bulbous bow retrofitting process was evaluated and approximate values of labours costs and cost for the task were determined. The results obtained for resistance during ship motion, EEOI, and fuel consumption reductions, or increases, were compared against the retrofitting values. The return cost of retrofitting is evaluated and measured in terms of fuel saved.

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Section: Introductionmentioning

confidence: 99%

Retrofitting the Bow of a General Cargo Vessel Andevaluating Energy Efficiency Operational Index

Denev

2023

Polish Maritime Research

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“…As a result, a polar diagram of added resistance according to the wave directions is created by comparing potential method results. Similarly, as a numerical study, Cho et al [22] estimated the added resistance performance in bow-quartering sea conditions using the soft-mooring system. The artificial spring was implemented as an external force on the hull dynamic fluid body interaction (DFBI), which restore the non-restoring forces.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Hydrodynamic Performance of a Tanker in Bow Sea Conditions Depending on Restraint Conditions

Lee,

Hwang,

Kim

et al. 2023

JMSE

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The importance of accurate ship performance estimation is increasing for efficient ship operation. Ship performance has been evaluated through model tests in the past, but there are limitations in terms of facilities and costs. With the spread of high-performance computers, the method of evaluating the performance of a ship by numerical analysis, especially computational fluid dynamics (CFD), has become common. There have been many numerical studies on added resistance under various wave conditions for many years, showing a high reliability. Meanwhile, most of the studies were conducted under conditions where the degree of freedom (DOF) of the ship was limited due to computational complexity. In this study, we tried to compare the added resistance performance and fluid dynamics of S-VLCC with 6 DOFs in the regular wave conditions. One of the methods for utilizing the 6 DOFs is the soft-mooring system, which allows springs to be attached to the bow and stern to recover the non-restoring force of the hull. The second method considers the free-running condition. The virtual disk is used for the self-propulsion of the ship, and the rudder can be rotated to maintain its course. The propeller rotation speed and rudder angle are controlled through PID control. The bow wave (ψ = 180°) and oblique wave (ψ = 150°, 120°) conditions were considered, and various regular wave conditions from short to long wavelengths were regarded. The effects of restraint conditions on the added resistance and motion response amplitude operator (RAO), according to each wave condition, were compared. As a result, there was a difference in the roll motion for each restraint condition, and the y-direction force and yaw moment generated on the hull were compared to analyze the cause. In addition, we observed the change in flow characteristics by comparing the streamlines around the hull and the nominal wake on the propeller plane.

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A deep learning method for the prediction of ship fuel consumption in real operational conditions

Zhang,

Tsoulakos,

Kujala

et al. 2024

Engineering Applications of Artificial Intelligence

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A numerical study on the added resistance and motion of a ship in bow quartering waves using a soft spring system

Cited by 5 publications

References 23 publications

Retrofitting the Bow of a General Cargo Vessel Andevaluating Energy Efficiency Operational Index

Retrofitting the Bow of a General Cargo Vessel Andevaluating Energy Efficiency Operational Index

A Numerical Study on the Hydrodynamic Performance of a Tanker in Bow Sea Conditions Depending on Restraint Conditions

A deep learning method for the prediction of ship fuel consumption in real operational conditions

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