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Numerical investigation of Edinburgh Duck wave energy converter integrated with floating breakwaters

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Abstract

Hydrodynamic performance of hybrid floating structures consisting of Edinburgh Duck Wave Energy Converter (ED-WEC) integrated to different shapes of Floating Breakwaters (FBW) namely (i) box-type FBW, (ii) trapezoidal-type FBW, (iii) \(\pi\)-type FBW, (iv) parabolic-type FBW and (v) semi-circular-type FBW are investigated based on small amplitude wave theory. The study is performed on the harvesting of wave energy and increasing the wave power absorption from the scattered and the reflected waves due to the presence of oceanic structures integrated with WEC. The hydrodynamic analysis for the hybrid floating breakwater-WEC system is analysed using Ansys AQWA. The associated diffractions and motions of the hybrid floating breakwater-WEC system are examined. The motion responses and resulting wave forces for the heave motion of ED-WEC with different parameters such as width of ED, draft of ED, distance between ED-WEC and floating breakwater and angle of incident are investigated. Further, the study is carried out for isolated ED-WEC and isolated breakwaters. The study performed will help in developing an efficient and reliable form of device for harnessing maximum wave energy into electricity along with the breakwater having practical application of ED-WEC at the initial stages of design. The study will provide a potential solution of generating power from the wave energy and as a coastal defence structure with the presence of floating breakwaters.

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Data Availability

All data supporting this study are available from the corresponding author upon reasonable request.

Abbreviations

A jk :

Added mass

B jk :

Radiation damping

B k :

Distance between \(Z_{c}\) and sea side face of floating breakwater

d b :

Draft of floating breakwater

f e :

Excitation wave force

f n :

Hydrostatic wave force

f PTO :

Power take-off force

f r :

Radiated wave force

f v :

Damping wave force due to viscosity

H b :

Height of floating breakwater

H :

Depth of water

K :

Wave number

L b :

Length of floating breakwater

l d :

Line of symmetry of ED-WEC

R :

Radius of ED-WEC at stern

RAOHeave :

Heave response amplitude operators

T :

Time period

t b :

Thickness of floating breakwater

x 0 :

Wetted surface of the body

Z c :

Center of rotation of ED-WEC

Β :

Angle between \(l_{d}\) and X-axis

z, \(\dot{z}\),\(\ddot{z}\) :

Displacement, velocity and acceleration

Η :

Incident wave amplitude

ϕ D :

Diffraction wave potential

ϕ I :

Incident wave potential

ϕ R :

Radiated wave potential

ω :

Wave frequency

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Acknowledgements

The authors express their gratitude to the Ministry of Education, Government of India, and the National Institute of Technology, Karnataka, Surathkal, for providing necessary facilities. DK acknowledges the partial support from Ministry of Ports, Shipping and Waterways, India through the research grant no. DW/01013(13)/2/2021.

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Authors and Affiliations

  1. Department of Water Resources and Ocean Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, 575025, India

    Ray Rahul Vidyabhushan & D. Karmakar

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  1. Ray Rahul Vidyabhushan
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Vidyabhushan, R.R., Karmakar, D. Numerical investigation of Edinburgh Duck wave energy converter integrated with floating breakwaters. Mar Syst Ocean Technol 18, 64–88 (2023). https://doi.org/10.1007/s40868-023-00125-6

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