Ocean Systems Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Performance evaluation of a seawater exchange breakwater with Helmholtz resonator using OpenFOAM

  • Georgea, Arun (Department of Ocean System Engineering, Jeju National University) ;
  • Cho, Il-Hyoung (Department of Ocean System Engineering, Jeju National University)
  • Received : 2021.07.28
  • Accepted : 2021.08.17
  • Published : 2021.09.25
⟨ Previous Next ⟩

Abstract

In this study, the three dimensional numerical simulation of a seawater exchange breakwater using the Helmholtz resonator has been carried out in OpenFOAM. When the frequency of the incident wave coincides with one of the natural frequencies of a closed semi-circular resonator, resonance occurs in the resonator. The amplified water elevation in a resonator pushes the seawater periodically into the ocean/port side through the water channel and consequently improves the water quality of the port. The numerical model is based on Reynolds Averaged Navier Stokes equations with k - ω SST turbulence model. The VOF (Volume of Fluid) method is used to capture the free surface behavior. The numerical model is validated with model experiments conducted by Cho (2001) in a two-dimensional wave tank for regular waves. Numerical simulations for the prototype model in irregular waves based on the JONSWAP spectrum are also conducted to show whether the proposed seawater exchange breakwater can be feasible to the real seas. It is found that the seawater exchanging rate is greatly enhanced in the low-frequency wave region where the frequency of the Helmholtz resonance situates. If designing the Helmholtz resonator properly, it can supply the clean seawater sustainedly into the port side without additional electric power.

Keywords

Acknowledgement

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1D1A1B04035231), South Korea.

References

  1. Cho, I.H. (2001), "Performance evaluation of seawater exchanging breakwater using Helmholtz resonator", J. Korean Soc. Coast. Ocean Engineers, 13(2), 89-99. (In Korean)
  2. Devolder, B., Rauwoens, P. and Troch, P. (2017), "Application of a buoyancy-modified k-ω SST turbulence model to simulate wave run-up around a monopile subjected to regular waves using OpenFOAM®", Coast. Eng., 125, 81-94. https://doi.org/10.1016/j.coastaleng.2017.04.004
  3. Higuera, P., Lara, J.L. and Losada, I.J. (2013), "Realistic wave generation and active wave absorption for Navier-Stokes models. Application to OpenFOAM®", Coast. Eng., 71, 102-118. https://doi.org/10.1016/j.coastaleng.2012.07.002.
  4. Higuera, P., Lara, J.L. and Losada, I.J. (2013), "Simulating coastal engineering processes with OpenFOAM®", Coast. Eng., 71, 119-134. https://doi.org/10.1016/j.coastaleng.2012.06.002.
  5. Hirt, C.W. and Nichols, B.D. (1981), "Volume of fluid (VOF) method for the dynamics of free boundaries", J. Comput. Phys., 39(1), 201-225. https://doi.org/10.1016/0021-9991(81)90145-5.
  6. Jacobsen, N.G., Fuhrman, D.R. and Fredsoe, J. (2012), "A wave generation toolbox for the open-source CFD library: OpenFoam®", Int. J. Numer. Meth. Fl., 70(9), 1073-1088. https://doi.org/10.1002/fld.2726.
  7. Kim, K.H., Seo, H. and Kobayashi, N. (2011), "Field assessment of seawater exchange breakwater", J. Waterwa. Port Coast. Ocean Eng., 137(3), 146-149. https://doi.org/10.1061/(asce)ww.1943-5460.0000058.
  8. Lee, C. and Lee, D.S. (2003), "Water surface resonance in the L-shaped channel of seawater exchange breakwater", Ocean Eng., 30(18), 2423-2436. https://doi.org/10.1016/S0029-8018(03)00102-1.
  9. Lee, D.S., Park, W.S. and Kobayashi, N. (1995), "Circular channel breakwater to reduce wave overtopping and allow water exchange", Proceedings of the 24th International Conference on Coastal Engineering, Kobe, Japan, October. https://doi.org/10.1061/9780784400890.100.
  10. Menter, F.R. (1994), "Two-equation eddy-viscosity turbulence models for engineering applications", AIAA J., 32(8), 1598-1605. https://doi.org/10.2514/3.12149.
  11. OpenFOAM® v1912 (19 12), https://www.OpenFOAM®.com/
  12. Ringwood, J.V. (2015), "Implementation of an OpenFOAM Numerical Wave Tank for Wave Energy Experiments", Proceedings of the 11th European Wave and Tidal Energy Conference, Nantes, France, September.
  13. Van Der Meer, J.W. (1995), Conceptual Design of Rubble Mound Breakwaters, 221-315. https://doi.org/10.1142/9789812797582_0005.