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Bottom slamming on heaving point absorber wave energy devices

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Abstract
Oscillating point absorber buoys may rise out of the water and be subjected to bottom slamming upon re-entering the water. Numerical simulations are performed to estimate the power absorption, the impact velocities and the corresponding slamming forces for various slamming constraints. Three buoy shapes are considered: a hemisphere and two conical shapes with deadrise angles of 30 and 45, with a waterline diameter of 5 m. The simulations indicate that the risk of rising out of the water is largely dependent on the buoy draft and sea state. Although associated with power losses, emergence occurrence probabilities can be significantly reduced by adapting the control parameters. The magnitude of the slamming load is severely influenced by the buoy shape. The ratio between the peak impact load on the hemisphere and that on the 45 cone is approximately 2, whereas the power absorption is only 4-8% higher for the 45 degrees cone. This work illustrates the need to include slamming considerations aside from power absorption criteria in the buoy shape design process and the control strategy.
Keywords
Impact, Point absorber, Emergence occurrence probability, Slamming, Wave energy, IMPACT, SURFACE, FORCE, LIQUID

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Citation

Please use this url to cite or link to this publication:

Chicago
De Backer, Griet, Marc Vantorre, Peter Frigaard, Charlotte Beels, and Julien De Rouck. 2010. “Bottom Slamming on Heaving Point Absorber Wave Energy Devices.” Journal of Marine Science and Technology 15 (2): 119–130.
APA
De Backer, Griet, Vantorre, M., Frigaard, P., Beels, C., & De Rouck, J. (2010). Bottom slamming on heaving point absorber wave energy devices. JOURNAL OF MARINE SCIENCE AND TECHNOLOGY, 15(2), 119–130.
Vancouver
1.
De Backer G, Vantorre M, Frigaard P, Beels C, De Rouck J. Bottom slamming on heaving point absorber wave energy devices. JOURNAL OF MARINE SCIENCE AND TECHNOLOGY. 2010;15(2):119–30.
MLA
De Backer, Griet, Marc Vantorre, Peter Frigaard, et al. “Bottom Slamming on Heaving Point Absorber Wave Energy Devices.” JOURNAL OF MARINE SCIENCE AND TECHNOLOGY 15.2 (2010): 119–130. Print.
@article{1248166,
  abstract     = {Oscillating point absorber buoys may rise out of the water and be subjected to bottom slamming upon re-entering the water. Numerical simulations are performed to estimate the power absorption, the impact velocities and the corresponding slamming forces for various slamming constraints. Three buoy shapes are considered: a hemisphere and two conical shapes with deadrise angles of 30 and 45, with a waterline diameter of 5 m. The simulations indicate that the risk of rising out of the water is largely dependent on the buoy draft and sea state. Although associated with power losses, emergence occurrence probabilities can be significantly reduced by adapting the control parameters. The magnitude of the slamming load is severely influenced by the buoy shape. The ratio between the peak impact load on the hemisphere and that on the 45 cone is approximately 2, whereas the power absorption is only 4-8\% higher for the 45 degrees cone. This work illustrates the need to include slamming considerations aside from power absorption criteria in the buoy shape design process and the control strategy.},
  author       = {De Backer, Griet and Vantorre, Marc and Frigaard, Peter and Beels, Charlotte and De Rouck, Julien},
  issn         = {0948-4280},
  journal      = {JOURNAL OF MARINE SCIENCE AND TECHNOLOGY},
  keyword      = {Impact,Point absorber,Emergence occurrence probability,Slamming,Wave energy,IMPACT,SURFACE,FORCE,LIQUID},
  language     = {eng},
  number       = {2},
  pages        = {119--130},
  title        = {Bottom slamming on heaving point absorber wave energy devices},
  url          = {http://dx.doi.org/10.1007/s00773-010-0083-0},
  volume       = {15},
  year         = {2010},
}

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