抄録
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.
| 元の言語 | 英語 |
|---|---|
| ページ（範囲） | 157-165 |
| ページ数 | 9 |
| ジャーナル | Journal of Waterway, Port, Coastal and Ocean Engineering |
| 巻 | 132 |
| 発行部数 | 3 |
| DOI | |
| 出版物ステータス | 出版済み - 5 1 2006 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Water Science and Technology
- Ocean Engineering
これを引用
Computation of short-crested deepwater waves. / Ioualalen, Mansour; Okamura, Makoto; Cornier, S.; Kharif, C.; Roberts, A. J.
：: Journal of Waterway, Port, Coastal and Ocean Engineering, 巻 132, 番号 3, 01.05.2006, p. 157-165.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - Computation of short-crested deepwater waves
AU - Ioualalen, Mansour
AU - Okamura, Makoto
AU - Cornier, S.
AU - Kharif, C.
AU - Roberts, A. J.
PY - 2006/5/1
Y1 - 2006/5/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=33645834138&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33645834138&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)0733-950X(2006)132:3(157)
DO - 10.1061/(ASCE)0733-950X(2006)132:3(157)
M3 - Article
AN - SCOPUS:33645834138
VL - 132
SP - 157
EP - 165
JO - Journal of Waterway, Port, Coastal and Ocean Engineering
JF - Journal of Waterway, Port, Coastal and Ocean Engineering
SN - 0733-950X
IS - 3
ER -