globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1922584117
论文题名:
The dual nature of the dead-water phenomenology: Nansen versus Ekman wave-making drags
作者: Fourdrinoy J.; Dambrine J.; Petcu M.; Pierre M.; Rousseaux G.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:29
起始页码: 16770
结束页码: 16775
语种: 英语
英文关键词: Dead water ; Lateral confinement ; Linear dispersive undulating depression ; Stratified fluids ; Wave-making drags
Scopus关键词: dead water ; unclassified drug ; water ; acceleration ; Article ; calculation ; comparative study ; controlled study ; dynamics ; Ekman wave making drag ; motion ; Nansen wave making drag ; oscillation ; phenomenology ; physical phenomena ; priority journal ; ship ; velocity
英文摘要: A ship encounters a higher drag in a stratified fluid compared to a homogeneous one. Grouped under the same “dead-water” vocabulary, two wave-making resistance phenomena have been historically reported. The first, the Nansen wave-making drag, generates a stationary internal wake which produces a kinematic drag with a noticeable hysteresis. The second, the Ekman wave-making drag, is characterized by velocity oscillations caused by a dynamical resistance whose origin is still unclear. The latter has been justified previously by a periodic emission of nonlinear internal waves. Here we show that these speed variations are due to the generation of an internal dispersive undulating depression produced during the initial acceleration of the ship within a linear regime. The dispersive undulating depression front and its subsequent whelps act as a bumpy treadmill on which the ship would move back and forth. We provide an analytical description of the coupled dynamics of the ship and the wave, which demonstrates the unsteady motion of the ship. Thanks to dynamic calculations substantiated by laboratory experiments, we prove that this oscillating regime is only temporary: the ship will escape the transient Ekman regime while maintaining its propulsion force, reaching the asymptotic Nansen limit. In addition, we show that the lateral confinement, often imposed by experimental setups or in harbors and locks, exacerbates oscillations and modifies the asymptotic speed. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163428
Appears in Collections:气候变化与战略

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作者单位: Fourdrinoy, J., Institut Pprime, CNRS, Université de Poitiers, Institut supérieur de l'aéronautique et de l'espace-École nationale supérieure de mécanique et d'aérotechnique (ISAE-ENSMA), Poitiers Cedex 9, 86073, France; Dambrine, J., Laboratoire de Mathématiques et Applications, Université de Poitiers, CNRS, Poitiers Cedex 9, 86073, France; Petcu, M., Laboratoire de Mathématiques et Applications, Université de Poitiers, CNRS, Poitiers Cedex 9, 86073, France, Institute of Mathematics of the Romanian Academy, Bucharest, 010702, Romania, Institute of Statistics and Applied Mathematics of the Romanian Academy, Bucharest, 050711, Romania; Pierre, M., Laboratoire de Mathématiques et Applications, Université de Poitiers, CNRS, Poitiers Cedex 9, 86073, France; Rousseaux, G., Institut Pprime, CNRS, Université de Poitiers, Institut supérieur de l'aéronautique et de l'espace-École nationale supérieure de mécanique et d'aérotechnique (ISAE-ENSMA), Poitiers Cedex 9, 86073, France

Recommended Citation:
Fourdrinoy J.,Dambrine J.,Petcu M.,et al. The dual nature of the dead-water phenomenology: Nansen versus Ekman wave-making drags[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(29)
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