Numerical Study on the Optimal Shape and Performance of an Oscillating Water Column Using Analytic Air Damping Coefficients and Numerical Wave Tank

Kim, Dong-Min; Min, Eun-Hong; Koo, Weoncheol

doi:10.7846/jkosmee.2021.24.1.1

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…Liu et al (2010) also considered the MEL method and studied the interaction between incident waves and structures using the desingularized boundary integral equation method (DBIEM), which distributes the source outside the boundary of the fluid computational domain. Kim et al (2021a) calculated the pneumatic damping coefficient, which has a similar meaning to the coefficient that converts the air pressure in a chamber into electrical energy, as a theoretical solution, and applied it to a two-dimensional numerical wave tank to obtain the energy extraction efficiency of an OWC. Such method differs from the method where the air damping coefficient is Fig.…”

Section: Potential Flow Analysis Of Owcmentioning

confidence: 99%

Oscillating Water Column (OWC) Wave Energy Converter Part 1: Fixed OWC

Yang

Jung

Koo

2022

J. Ocean Eng. Technol.

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<i>This study reviews the recent development and research results of a fixed oscillating water column (OWC) wave energy converter (WEC). The OWC WEC can be divided into fixed and floating types based on the installation location and movement of the structure. In this article, the study on a stationary OWC WEC, which is close to commercialization through the accumulation of long-term research achievements, is divided into five research categories with a focus on primary energy conversion research. These research categories include potential-flow-based numerical analysis, wave tank experiments, computational fluid dynamics analyses toward investigation of fluid viscous effects, U-shaped OWC studies that can amplify water surface displacement in the OWC chamber, and studies on OWC prototypes that have been installed and operated in real sea environments. This review will provide an overview of recent research on the stationary OWC WEC and basic information for further detailed studies on the OWC.</i>

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Section: Potential Flow Analysis Of Owcmentioning

confidence: 99%

Oscillating Water Column (OWC) Wave Energy Converter Part 1: Fixed OWC

Yang

Jung

Koo

2022

J. Ocean Eng. Technol.

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“…The fixed OWC WEC can be divided into four energy flux components: incident wave energy, reflected wave energy, maximum extractable energy of the turbine due to pneumatic pressure, and energy loss due to viscosity. Each of the four energy flux components can be expressed as follows (Koo et al, 2010;Kim et al, 2021).…”

Section:       mentioning

confidence: 99%

“…Ning et al (2016) compared the results of numerical analysis using HOBEM and the results obtained from water tank experiments. Kim et al (2021) calculated the energy extraction efficiency of OWC WEC by applying the air damping coefficient in the chamber obtained by the theoretical solution, and compared their results with the results of previous studies with the application of the air damping coefficient.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Wave Energy Extraction Performance According to the Body Shape and Scale of the Breakwater-integrated Sloped OWC

Yang

Min

Koo

2021

J. Ocean Eng. Technol.

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Research on the development of marine renewable energy is actively in progress. Various studies are being conducted on the development of wave energy converters. In this study, a numerical analysis of wave-energy extraction performance was performed according to the body shape and scale of the sloped oscillating water column (OWC) wave energy converter (WEC), which can be connected with the breakwater. The sloped OWC WEC was modeled in the time domain using a two-dimensional fully nonlinear numerical wave tank. The nonlinear free surface condition in the chamber was derived to represent the pneumatic pressure owing to the wave column motion and viscous energy loss at the chamber entrance. The free surface elevations in the sloped chamber were calculated at various incident wave periods. For verification, the results were compared with the 1:20 scaled model test. The maximum wave energy extraction was estimated with a pneumatic damping coefficient. To calculate the energy extraction of the actual size WEC, OWC models approximately 20 times larger than the scale model were calculated, and the viscous damping coefficient according to each size was predicted and applied. It was verified that the energy, owing to the airflow in the chamber, increased as the incident wave period increased, and the maximum efficiency of energy extraction was approximately 40% of the incident wave energy. Under the given incident wave conditions, the maximum extractable wave power at a chamber length of 5 m and a skirt draft of 2 m was approximately 4.59 kW/m.

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Numerical Study on the Optimal Shape and Performance of an Oscillating Water Column Using Analytic Air Damping Coefficients and Numerical Wave Tank

Cited by 2 publications

References 13 publications

Oscillating Water Column (OWC) Wave Energy Converter Part 1: Fixed OWC

Oscillating Water Column (OWC) Wave Energy Converter Part 1: Fixed OWC

Numerical Analysis of Wave Energy Extraction Performance According to the Body Shape and Scale of the Breakwater-integrated Sloped OWC

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