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Nonlinear focusing of surface waves by a lens – theory and experiment

Published online by Cambridge University Press:  20 April 2006

Jakob J. Stamnes ,
Odd Løvhaugen ,
Bjøsrn Spjelkavik ,
Chiang C. Mei ,
Edmond Lo  and
Dick K. P. Yue
Jakob J. Stamnes
Affiliation:
Central Institute for Industrial Research, P.O. Box 350, Blindern, Oslo 3. Norway
Odd Løvhaugen
Affiliation:
Central Institute for Industrial Research, P.O. Box 350, Blindern, Oslo 3. Norway
Bjøsrn Spjelkavik
Affiliation:
Central Institute for Industrial Research, P.O. Box 350, Blindern, Oslo 3. Norway
Chiang C. Mei
Affiliation:
Department of Civil Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A.
Edmond Lo
Affiliation:
Department of Civil Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A.
Dick K. P. Yue
Affiliation:
Department of Civil Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A.
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Abstract

One of the recent developments in harnessing wave energy is to construct a line of submerged structures parallel to the incident swell crests in order to transform the straight crests to circular crests converging to a focus. To understand the neighbourhood of the focus, we have carried out theoretical studies by accounting for diffraction and nonlinearity, both separately and jointly. Experiments have also been conducted in a large outdoor basin and are compared with the theories. These comparisons tend to favour the approximate nonlinear theory, but the efficiency of the focusing device as an energy concentrator does not appear to be significantly impaired by nonlinear effects.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 135 , October 1983 , pp. 71 - 94
Copyright
© 1983 Cambridge University Press

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