Study on Roll Motion Characteristics of a Rectangular Floating Structure in Regular Waves

Kim, Mingyu; Jung, Kwang Hyo; Park, Sung-Boo; Lee, Gang Nam; Park, Il-Ryong; Suh, Sung-Bu

doi:10.26748/ksoe.2019.009

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…For wave generation, as shown in Figure 11, the velocity condition of the airy wave theory was imposed on all velocity inlet interfaces, and the wave forcing technique in STAR-CCM+ was introduced to the wave absorber used to suppress reflected waves [22]. According to Kim et al [23], the wave forcing technique combines two methods-one that reduces the wave amplitude using the wave-damping coefficient in the wave-absorption area [24][25][26] and the other that forces the reflected waves by mathematically harmonizing the wave information obtained from the linear wave theory in a given area between the waves inside the flow field and the given incident waves [27,28]. In this study, one wavelength (1.0λ) was set for all the velocity inlet interfaces to suppress the reflected waves as much as possible.…”

Section: Motion Analysis Using Cfd (2nd-stage)mentioning

confidence: 99%

CFD-Modified Potential Simulation on Seakeeping Performance of a Barge

Nam

Park

et al. 2022

Water

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This study proposes a computational fluid dynamics (CFD)-modified potential (CMP) model. This hybrid model uses linear potential theory with a corrected damping ratio obtained from CFD simulations to analyze the seakeeping performance of a small vessel. According to the analysis procedure of the proposed model, a motion analysis, including the prediction of the roll and pitch damping ratio of a small barge, was conducted; to verify reliability; the results were compared to those of an experiment performed in a physical tank. The relative errors in the experiment for peak amplitude in the roll motion response amplitude operators (RAOs) using the CMP model were relatively small, whereas those obtained from only the potential analysis were large errors in all three conventionally used roll-damping ratios. In addition, the computational time consumed by the CMP model was longer than that consumed by the potential theory but faster than the full CFD simulation for all wave conditions. Subsequently, based on the motion analysis results, the seakeeping performance was evaluated in a real sea environment, and the results on the single significant amplitude (SSA) were discussed through comparison with the results of the potential analysis and experiment.

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Section: Motion Analysis Using Cfd (2nd-stage)mentioning

confidence: 99%

CFD-Modified Potential Simulation on Seakeeping Performance of a Barge

Nam

Park

et al. 2022

Water

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“…Suk et al (2016) performed a free decay test using CFD, and then estimated the motion performance of a platform supply vessel using Maxsurf Motion, which is commercial motion analysis software, along with the calculated damping coefficient. In addition, Ko et al (2018a), Ko et al (2018b), and Kim et al (2019) performed free decay tests using experiments and CFD to estimate the motion responses of floating bodies in regular waves, and analyzed the motion characteristics.…”

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confidence: 99%

Numerical Study on the Improvement of the Motion Performance of a Light Buoy

Son

Jeong

2020

J. Ocean Eng. Technol.

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A light buoy is generally moored in a port, inland waterway, or coastal area to provide route information to ships sailing nearby based on its shape, color, and installed lanterns, and to provide information about hazards such as the presence of reefs or shallow water. Because conventional light buoys are made of iron materials, they are heavy, susceptible to corrosion and erosion, difficult to maintain, and have reported problems such as collisions with ships resulting in human injuries. To improve these problems, light buoys that adopt eco-friendly and lightweight materials have been developed (Jeong et al., 2017). The motions of floating offshore structures, as well as the light buoys, which are the subject of this study, are particularly affected by external environmental loads (esp., waves). To secure the motion and structural stability, the difference between the natural frequency of the structure and the frequency of the primary wave in the installation area should be increased or appendages should be developed and/or applied to improve the motion performance. In the case of light buoy, it is necessary to secure the performance of the pitch and roll motions because it is important to secure the visibility of the installed lantern even during these motions. In addition, if excessive heave occurs, it may cause structural damage to the mooring system. Son et al. (2018) estimated the wind and current loads acting on a light buoy subject to changes in the wind direction, wind speed, and current direction at various sea states using computational fluid dynamics (CFD) and analyzed the potential-based motion analysis of a single-moored light buoy by applying the estimated load. As a result of the analysis, it was predicted that the pitch and roll would show large values that did not satisfy the design target under certain sea status. One of the reasons was that viscous damping effect was not considered, which will be described later. In general, experimental methods and numerical methods based on potential theory are widely used to estimate the motion performances of ships and floating bodies. Among these, it is difficult for potential-based motion analysis to accurately estimate motions that exhibit relatively strong viscous effects and non-linearities. In order to compensate for this problem, studies are in progress in which a viscous damping coefficient calculated through a free decay test or forced

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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

Cho

Lee

et al. 2023

Ocean Engineering

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Study on Roll Motion Characteristics of a Rectangular Floating Structure in Regular Waves

Cited by 6 publications

References 11 publications

CFD-Modified Potential Simulation on Seakeeping Performance of a Barge

CFD-Modified Potential Simulation on Seakeeping Performance of a Barge

Numerical Study on the Improvement of the Motion Performance of a Light Buoy

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

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