Comparison of wave diffraction forces on a surface-piercing body for various free-surface grid update schemes

Min, Eun-Hong; Koo, Weoncheol

doi:10.1016/j.oceaneng.2022.111912

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…When LC3 was applied to the single platform, however, the magnitude of the heave response was increased by approximately three times. This result was attributed to a phenomenon in which the load increases under the influence of the slowly decaying second-order pressure field as the incident wave is reflected from the cylinder-shaped floating body, and it has already been reported in several studies (Min and Koo, 2022;Koo and Kim, 2007;Kim, 1993, Kim andYue, 1989). The motion characteristics of TLP structures respond to 2 nd -order sum-frequency wave loads.…”

Section: Analysis Of the Motion Responses Of The Combined Energy Plat...mentioning

confidence: 58%

Motion Analysis of A Wind-Wave Energy TLP Platform Considering Second-order Wave Forces

Kim

Min

Heo

et al. 2022

J. Ocean Eng. Technol.

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Energy consumption is increasing rapidly with population growth and technological development. In particular, the excessive development and use of fossil energy cause a global pollution problem, and excessive greenhouse gas emissions, including carbon dioxide, leads to global warming and various environmental problems. Therefore, it is essential to develop technologies for renewable energy, which is a sustainable and eco-friendly energy source (Muliawan et al., 2013;Ullah et al., 2020).Among renewable energy sources, offshore wind energy, wave energy, and current energy, which are representative offshore energy sources, require future-oriented and continuous technology development. In particular, many technologies have been developed for offshore wind energy because it has benefits in terms of wind homogeneity and speed as well as the installation location compared to onshore wind energy (land-based wind energy). Large-scale commercial power generation is also possible because it is free of the restrictions of many wind turbine installation spaces and noise (Bae and Kim, 2013). As offshore wind turbine technology has grown into a major energy source worldwide, including in Europe, many studies have been conducted to increase the economic feasibility of offshore wind turbine platforms (Global Wind Energy Council Global, 2019).A combined wind-wave energy platform in which wave energy converters (WECs) are attached to floating wind turbines has been reported as one way to increase the economic feasibility of floating offshore wind turbine (FOWT) in many studies. The combined energy platform is based on the typical characteristics of ocean environments: relatively high waves accompany high wind speeds. Moreover, using two energy sources makes it possible to reduce the energy extraction variability of a single offshore wind turbine and increase the economic effects (Kim et al., 2015). As a combined wind-wave energy platform type, there is a combined platform model that combines the OC4 model (Robertson et al., 2014), a semi-submersible wind turbine structure disclosed by the National Renewable Energy Lab (NREL) in the United States, with Wavestar-type WECs (Hansen et al., 2013). Si et al. (2021

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Section: Analysis Of the Motion Responses Of The Combined Energy Plat...mentioning

confidence: 58%

Motion Analysis of A Wind-Wave Energy TLP Platform Considering Second-order Wave Forces

Kim

Min

Heo

et al. 2022

J. Ocean Eng. Technol.

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“…Potential flow-based numerical analysis has been commonly applied to the motion analysis of ocean waves and floating bodies using the boundary element method. In particular, time-and frequency-domain analysis for floating body motion has been widely conducted via modeling under the same conditions as an experimental tank through the numerical wave tank (NWT) technique (Uzair and Koo, 2012;Min and Koo, 2017;Min and Koo, 2022). This numerical analysis technique was used to model the motion of a submerged body and calculate free surface waves according to the submerged depth and velocity of the submerged body (Holloway and Davis, 2002;Kim et al, 2019;Seong et al, 2022).…”

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confidence: 99%

Experimental and Numerical Study on the Characteristics of Free Surface Waves by the Movement of a Circular Cylinder-Shaped Submerged Body in a Single Fluid Layer

Kim¹,

Min²,

Koo³

2023

J. Ocean Eng. Technol.

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Analyzing the interactions of free surface waves caused by a submerged-body movement is important as a fundamental study of submerged-body motion. In this study, a two-dimensional mini-towing tank was used to tow an underwater body for analyzing the generation and propagation characteristics of free surface waves. The magnitude of the maximum wave height generated by the underwater body motion increased with the body velocity at shallow submerged depths but did not increase further when the generated wave steepness corresponded to a breaking wave condition. Long-period waves were generated in the forward direction as the body moved initially, and then short-period waves were measured when the body moved at a constant velocity. In numerical simulations based on potential flow, the fluid pressure changes caused by the submerged-body motion were implemented, and the maximum wave height was accurately predicted; however, the complex physical phenomena caused by fluid viscosity and wave breaking in the downstream direction were difficult to implement. This research provides a fundamental understanding of the changes in the free surface caused by a moving underwater body.

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Free surface and internal periodical waves generated by an oscillating floater in two-layer fluids using fully nonlinear numerical wave tank

Min,

Kim,

Koo

2023

Ocean Engineering

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Comparison of wave diffraction forces on a surface-piercing body for various free-surface grid update schemes

Cited by 4 publications

References 20 publications

Motion Analysis of A Wind-Wave Energy TLP Platform Considering Second-order Wave Forces

Motion Analysis of A Wind-Wave Energy TLP Platform Considering Second-order Wave Forces

Experimental and Numerical Study on the Characteristics of Free Surface Waves by the Movement of a Circular Cylinder-Shaped Submerged Body in a Single Fluid Layer

Free surface and internal periodical waves generated by an oscillating floater in two-layer fluids using fully nonlinear numerical wave tank

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