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Ocean Energy Systems Wave Energy Modeling Task 10.4: Numerical Modeling of a Fixed Oscillating Water Column
- Source :
- Bingham, H B, Yu, Y H, Nielsen, K, Tran, T T, Kim, K H, Park, S, Hong, K, Said, H A, Kelly, T, Ringwood, J V, Read, R W, Ransley, E, Brown, S & Greaves, D 2021, ' Ocean energy systems wave energy modeling task 10.4 : Numerical modeling of a fixed oscillating water column ', Energies, vol. 14, no. 6, 1718 . https://doi.org/10.3390/en14061718, Energies; Volume 14; Issue 6; Pages: 1718, Bingham, H B, Yu, Y-H, Nielsen, K, Tran, T T, Kim, K-H, Park, S, Hong, K, Said, H A, Kelly, T, Ringwood, J V, Read, R W, Ransley, E, Brown, S & Greaves, D 2021, ' Ocean Energy Systems Wave Energy Modeling Task 10.4: Numerical Modeling of a Fixed Oscillating Water Column ', Energies, vol. 14, no. 6, 1718 . https://doi.org/10.3390/en14061718, Energies, Vol 14, Iss 1718, p 1718 (2021)
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- This paper reports on an ongoing international effort to establish guidelines for numerical modeling of wave energy converters, initiated by the International Energy Agency Technology Collaboration Program for Ocean Energy Systems. Initial results for point absorbers were presented in previous work, and here we present results for a breakwater-mounted Oscillating Water Column (OWC) device. The experimental model is at scale 1:4 relative to a full-scale installation in a water depth of 12.8 m. The power-extracting air turbine is modeled by an orifice plate of 1–2% of the internal chamber surface area. Measurements of chamber surface elevation, air flow through the orifice, and pressure difference across the orifice are compared with numerical calculations using both weakly-nonlinear potential flow theory and computational fluid dynamics. Both compressible- and incompressible-flow models are considered, and the effects of air compressibility are found to have a significant influence on the motion of the internal chamber surface. Recommendations are made for reducing uncertainties in future experimental campaigns, which are critical to enable firm conclusions to be drawn about the relative accuracy of the numerical models. It is well-known that boundary element method solutions of the linear potential flow problem (e.g., WAMIT) are singular at infinite frequency when panels are placed directly on the free surface. This is problematic for time-domain solutions where the value of the added mass matrix at infinite frequency is critical, especially for OWC chambers, which are modeled by zero-mass elements on the free surface. A straightforward rational procedure is described to replace ad-hoc solutions to this problem that have been proposed in the literature.
- Subjects :
- Control and Optimization
Experimental measurements
Wave energy
020209 energy
Oscillating Water Column
Energy Engineering and Power Technology
computational fluid dynamics
02 engineering and technology
Computational fluid dynamics
lcsh:Technology
boundary element method
Numerical modeling
Marine energy
0202 electrical engineering, electronic engineering, information engineering
Boundary element method
Electrical and Electronic Engineering
Engineering (miscellaneous)
lcsh:T
Renewable Energy, Sustainability and the Environment
business.industry
wave energy
experimental measurements
numerical modeling
simulation
Orifice plate
Mechanics
021001 nanoscience & nanotechnology
Free surface
Compressibility
Environmental science
Potential flow
0210 nano-technology
business
Simulation
Body orifice
Energy (miscellaneous)
Subjects
Details
- ISSN :
- 19961073
- Volume :
- 14
- Database :
- OpenAIRE
- Journal :
- Energies
- Accession number :
- edsair.doi.dedup.....384b8ead0bf81a6749a05a817d65d480