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SUMMARY:Harnessing wave-power in open seas - Michael Stiassnie (Technion -
  Israel Institute of Technology)
DTSTART:20170808T133000Z
DTEND:20170808T143000Z
UID:TALK74911@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:The promise of wave-driven renewable energy is clear: with oce
 ans covering more than 70% of the Earth&#39\;s surface\, and the ability o
 f ocean waves\, once created by the wind\, to transport energy over large 
 distances\, it is natural to want to tap this vast resource. The rate of e
 nergy transfer from wind to waves is larger by a factor of 3 than the worl
 d&#39\;s present power consumption. However\, only 5 % of this power reach
 es coastal waters\, the remainder being dissipated by wave breaking in ope
 n seas. This highlights the need to study wave-power harvesting in deep op
 en seas: to estimate the global wave-power potential\, develop devices sui
 table for deep water\, and understand the geometry and layout of large arr
 ays that will be needed to capture wave energy on a globally significant s
 cale. <br><br>This talk will report on recent progress in these various di
 rections. A novel self-reacting twin-cylinder wave energy converter (WEC) 
 is discussed\, which extracts energy from three modes of motion without re
 quiring a fixed bottom reference. This WEC is employed to investigate surv
 ivability in extreme sea-states\, and also as one element in a large array
  of energy converters. In order to overcome the computational complexities
  of multiple-scattering theory\, a new approximate framework for sparse WE
 C arrays is developed\, which allows fast and flexible calculations of arr
 ay absorption\, transmission\, and reflection for changing wave conditions
 \, including directional seas. <br><br>The tools developed are also applic
 able to other resource assessment and WEC design studies\, and present a m
 ove towards understanding the third generation of wave-energy converters: 
 large\, deep-water devices deployed in farms throughout the open ocean.<br
 ><br><u>References<br></u><br>&#15\; D. Xu\, R. Stuhlmeier and M. Stiassni
 e\, <i>Harnessing wave power in open </i><i>seas II: very large arrays of 
 wave-energy converters for 2D sea states</i>\, J. Ocean Eng. Marine Energy
  3 (2017)\, 151-160.<br><br>&#15\; D. Xu\, R. Stuhlmeier and M. Stiassnie\
 ,<i> Assessing the size of a twin-cylinder wave energy converter designed 
 for real sea-states</i>\, submitted (arXiv:1605.00428).<br><br>&#15\; M. S
 tiassnie\, U. Kadri and R. Stuhlmeier\, <i>Harnessing wave-power in open s
 eas</i>\, J. Ocean Eng. Marine Energy 2 (2016)\, 47-57.<br>
LOCATION:Seminar Room 1\, Newton Institute
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