Resurrecting dead-water phenomenon

Mercier, Matthieu; Vasseur, Romain; Dauxois, Thierry

doi:10.5194/npg-18-193-2011

Cited by 50 publications

(61 citation statements)

References 22 publications

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“…Using Gauss's theorem to the volume integrals in (20), and using also that (d/dt)  S c φ 0 n 1 dS =  S c (∂φ 0 /∂t)n 1 dS along the geometric surface S c , we obtain for the force (21) is rewritten by…”

Section: B Forcementioning

confidence: 99%

“…19 A two-dimensional model scale experiment has emphasized the role of nonlinearity and non-stationarity in the dead water problem, see Mercier, Vasseur, and Dauxois. 20 The purpose of the paper is to perform strongly nonlinear calculations in three dimensions, of the dead water resistance on a ship and the wave wake in subcritical conditions, where the internal wave resistance is the largest. Various properties at critical speed are investigated.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear dead water resistance at subcritical speed

Grue

2015

Physics of Fluids

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The dead water resistance F1=12CdwρSU2 (ρ fluid density, U ship speed, S wetted body surface, Cdw resistance coefficient) on a ship moving at subcritical speed along the upper layer of a two-layer fluid is calculated by a strongly nonlinear method assuming potential flow in each layer. The ship dimensions correspond to those of the Polar ship Fram. The ship draught, b0, is varied in the range 0.25h0–0.9h0 (h0 the upper layer depth). The calculations show that Cdw/(b0/h0)2 depends on the Froude number only, in the range close to critical speed, Fr = U/c0 ∼ 0.875–1.125 (c0 the linear internal long wave speed), irrespective of the ship draught. The function Cdw/(b0/h0)2 attains a maximum at subcritical Froude number depending on the draught. Maximum Cdw/(b0/h0)2 becomes 0.15 for Fr = 0.76, b0/h0 = 0.9, and 0.16 for Fr = 0.74, b0/h0 = 1, where the latter extrapolated value of the dead water resistance coefficient is about 60 times higher than the frictional drag coefficient and relevant for the historical dead water observations. The nonlinear Cdw significantly exceeds linear theory (Fr < 0.85). The ship generated waves have a wave height comparable to the upper layer depth. Calculations of three-dimensional wave patterns at critical speed compare well to available laboratory experiments. Upstream solitary waves are generated in a wave tank of finite width, when the layer depths differ, causing an oscillation of the force. In a wide ocean, a very wide wave system develops at critical speed. The force approaches a constant value for increasing time.

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Section: B Forcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear dead water resistance at subcritical speed

Grue

2015

Physics of Fluids

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“…Oceanic internal waves [443][444][445][446][447][448][449], whose existence is known as "dead water" in the Viking age [450,451], are subject of great interest for oceanographers for their strong energy transport between continental shelf and deep water, their effects on phytoplankton and fishery, and the effects on ships, submarines, marine architecture, oil platforms, underwater communications, and sonar, as well as the effects on underwater workers. A comprehensive report on the oceanic internal waves is available with the principles and examples in [452].…”

Section: Internal Wavesmentioning

confidence: 99%

Recent Trend and Advance of Synthetic Aperture Radar with Selected Topics

2013

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The present article is an introductory paper in this special issue on synthetic aperture radar (SAR). A short review is presented on the recent trend and development of SAR and related techniques with selected topics, including the fields of applications, specifications of airborne and spaceborne SARs, and information contents in and interpretations of amplitude data, interferometric SAR (InSAR) data, and polarimetric SAR (PolSAR) data. The review is by no means extensive, and as such only brief summaries of of each selected topics and key references are provided. For further details, the readers are recommended to read the literature given in the references theirin.

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“…Следует отметить, что волновое движение на поверх-ностях раздела обладает целым рядом особенностей, в частности, реализуется нелинейный обмен энергий между гравитационными волнами на одной поверхности при катализационном участии волн, бегущих по другой поверхности [10], а также наблюдается такое явление как эффект " мертвой воды", реализующийся в много-слойной системе несмешивающихся жидкостей [11,12]. Можно выделить и другие интересные эффекты [13][14][15][16].…”

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