Computation of Short-Crested Deepwater Waves
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 132, Issue 3
Abstract
Short-crested waves are three-dimensional waves that may be generated through a reflection of a two-dimensional Stokes wave on a seawall. Thus, they are more likely to be observed near ports or any consequent marine structure. Two numerical methods are used to compute three-dimensional surface gravity short-crested waves on deepwater. The first method is an asymptotic procedure and the second computes a direct numerical solution. One of the main properties is the four-wave resonance. Such resonance introduces nonuniqueness with several solution branches connected through a turning point. We show that both computational methods are reliable for nonresonant waves, but that the direct numerical method converges faster. For resonant waves, the direct method is more appropriate because all solution branches can be obtained. The asymptotic method computes only one branch of solutions for any given parameter values, and is uncertain around and past any turning point. Stability analysis of the branches shows that, although sporadic, an instability associated with harmonic resonance is more likely to appear for one branch in the vicinity of the turning point. Consequently this could amplify the unstable resonant mode. The nonuniqueness of the solution requires careful attention in every study on the impact of surface waves on marine structures. It is shown here that the wave force exerted on a seawall may change drastically from one branch of solution to another.
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Acknowledgments
The writers thank the SST service at the French Ambassy at Tokyo for their valuable and constant support, in particular M.M. Robert Farhi and Michel Israel. Thanks also go to M. Ivan Conesa for his help and Mrs. Annie Tranchard for her technical support, both from IFREMER. Finally the writers are grateful to the editors and referees who contributed to a substantial improvment of the first draft of the manuscript, in particular through their suggestion to compute one engineering application.
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© 2006 ASCE.
History
Received: Aug 31, 2004
Accepted: Apr 27, 2005
Published online: May 1, 2006
Published in print: May 2006
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