Benchmark study of the DTU OWC chamber with both two-way and one-way absorption

Journal Article

Title: Benchmark study of the DTU OWC chamber with both two-way and one-way absorption

Author:

Bingham, H.; Joensen, B.; Read, R.; Nielsen, K.; Tran, T.; Said, H.; Kelly, T.; Ringwood, J.; Imai, Y.; van der Zanden, J.; Yu, Y.; Eskilsson, C.; Shiri, A.

Publication Date:

March 24, 2025

Journal:

Journal of Ocean Engineering and Marine Energy

Publisher:

Springer Nature

Affiliation:

Technical University of Denmark (DTU), University of the Faroe Islands, Aalborg University, National Renewable Energy Laboratory (NREL), Maynooth University (National University of Ireland, Maynooth; NUIM), Dundalk Institute of Technology, Saga University, Maritime Research Institute Netherlands, National Yang Ming Chiao Tung University, RISE Research Institutes of Sweden

Technology:

Wave, Oscillating Water Column

Collection Method:

Lab Data, Modeling

Engineering:

Performance

Language:

English

Document Access

Website:

External Link

Attachment:

Access File

Notice: This material may be protected by Copyright Law.

Citation

Bingham, H.; Joensen, B.; Read, R.; Nielsen, K.; Tran, T.; Said, H.; Kelly, T.; Ringwood, J.; Imai, Y.; van der Zanden, J.; Yu, Y.; Eskilsson, C.; Shiri, A. (2025). Benchmark study of the DTU OWC chamber with both two-way and one-way absorption. Journal of Ocean Engineering and Marine Energy, https://doi.org/10.1007/s40722-025-00384-y

@article{Bingham-2025-,
author = {Bingham, H and Joensen, B and Read, R and Nielsen, K and Tran, T and Said, H and Kelly, T and Ringwood, J and Imai, Y and van der Zanden, J and Yu, Y and Eskilsson, C and Shiri, A},
title = {Benchmark study of the DTU OWC chamber with both two-way and one-way absorption},
journal = {Journal of Ocean Engineering and Marine Energy},
year = {2025},
month = {mar},
publisher = {Springer Nature},
doi = {10.1007/s40722-025-00384-y},
url = {https://link.springer.com/article/10.1007/s40722-025-00384-y},
keywords = {Wave, Oscillating Water Column, Lab Data, Modeling, Performance},
}

Export Citation to BibTex

TY - JOUR
TI - Benchmark study of the DTU OWC chamber with both two-way and one-way absorption
AU - Bingham, H
AU - Joensen, B
AU - Read, R
AU - Nielsen, K
AU - Tran, T
AU - Said, H
AU - Kelly, T
AU - Ringwood, J
AU - Imai, Y
AU - van der Zanden, J
AU - Yu, Y
AU - Eskilsson, C
AU - Shiri, A
T2 - Journal of Ocean Engineering and Marine Energy
AB - This paper reports on a benchmark study based on small-scale (1:50) measurements of a single, oscillating water column chamber mounted sideways in a long flume. The geometry of the OWC chamber is extracted from a barge-like, attenuator-type floating concept “KNSwing” with 40 chambers targeted for deployment in the Danish part of the North Sea. In addition to traditional two-way energy extraction we also consider one-way energy extraction with passive venting and compare chamber response, pressures and total absorbed energy between the two methods. A blind study was established for the numerical modeling, with participants applying several implementations of weakly nonlinear potential flow theory and commercial Navier–Stokes solvers (CFD). Both compressible and incompressible models were used for the air phase. Potential flow calculations predict more energy absorption near the chamber resonance for one-way absorption than for two-way absorption, but the opposite is found from the experimental measurements. This outcome is mainly attributed to energy losses in the experimental passive valve system, but this conclusion must be confirmed by better experimental measurements. Modeling the one-way valve in CFD proved to be very challenging and only one team was able to provide results which were generally closer to the experiments. The study illustrates the challenges associated with both numerical and experimental analysis of OWC chambers. Air compressibility effects were not found to be important at this scale, even with the large volume of additional air used for the one-way case.
DA - 2025/03//
PY - 2025
PB - Springer Nature
UR - https://link.springer.com/article/10.1007/s40722-025-00384-y
DO - 10.1007/s40722-025-00384-y
LA - English
KW - Wave
KW - Oscillating Water Column
KW - Lab Data
KW - Modeling
KW - Performance
ER -

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Abstract

This paper reports on a benchmark study based on small-scale (1:50) measurements of a single, oscillating water column chamber mounted sideways in a long flume. The geometry of the OWC chamber is extracted from a barge-like, attenuator-type floating concept “KNSwing” with 40 chambers targeted for deployment in the Danish part of the North Sea. In addition to traditional two-way energy extraction we also consider one-way energy extraction with passive venting and compare chamber response, pressures and total absorbed energy between the two methods. A blind study was established for the numerical modeling, with participants applying several implementations of weakly nonlinear potential flow theory and commercial Navier–Stokes solvers (CFD). Both compressible and incompressible models were used for the air phase. Potential flow calculations predict more energy absorption near the chamber resonance for one-way absorption than for two-way absorption, but the opposite is found from the experimental measurements. This outcome is mainly attributed to energy losses in the experimental passive valve system, but this conclusion must be confirmed by better experimental measurements. Modeling the one-way valve in CFD proved to be very challenging and only one team was able to provide results which were generally closer to the experiments. The study illustrates the challenges associated with both numerical and experimental analysis of OWC chambers. Air compressibility effects were not found to be important at this scale, even with the large volume of additional air used for the one-way case.