The Wave Resistance of Ships

Wehausen, John V.

doi:10.1016/s0065-2156(08)70144-3

Cited by 97 publications

(52 citation statements)

References 115 publications

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“…Indeed, a well profiled hull notably reduces the wave resistance thus improving the velocity performances of the ship. Along with wake patterns, wave resistance has been widely studied both at practical (Peri et al 2001;Darrigol 2005) and theoretical levels (Havelock 1908;Wehausen 1973;Lighthill 1978).…”

Section: Introductionmentioning

confidence: 99%

Wake pattern and wave resistance for anisotropic moving disturbances

2014

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We present a theoretical study of gravity waves generated by an anisotropic moving disturbance. We model the moving object by an elliptical pressure field of given aspect ratio W. We study the wake pattern as a function of W and the longitudinal hull Froude number F r = V / √ gL, where V is the velocity, g the acceleration of gravity and L the size of the disturbance in the direction of motion. For large hull Froude numbers, we analytically show that the rescaled surface profiles for which √ W/F r is kept constant coincide. In particular, the angle outside which the surface is essentially flat remains constant and equal to the Kelvin angle, and the angle corresponding to the maximum amplitude of the waves scales as √ W/F r, thus showing that previous work on the wake's angle for isotropic objects can be extended to anisotropic objects of given aspect ratio. We then focus on the wave resistance and discuss its properties in the case of an elliptical Gaussian pressure field. We derive an analytical expression for the wave resistance in the limit of very elongated objects, and show that the position of the speed corresponding to the maximum wave resistance scales as √ gL/ √ W.

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Section: Introductionmentioning

confidence: 99%

Wake pattern and wave resistance for anisotropic moving disturbances

2014

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“…The first type uses the Kelvin wave source as the elementary singularity, satisfying the field equation and all the boundary conditions except the body-boundary condition. The major advantages of such a scheme are the automatic satisfaction of the radiation condition and the definition of the resulting BIE only on the ship hull; see e.g., Wehausen (1973). The second type uses the simple Rankine source, i.e., the fundamental solution of the Laplace equation, as the elementary singularity.…”

Section: Introductionmentioning

confidence: 99%

A BEM-isogeometric method for the ship wave-resistance problem

et al. 2013

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In the present work IsoGeometric Analysis is applied to the solution of the Boundary Integral Equation associated with the Neumann-Kelvin problem and the calculation of the wave resistance of ships. As opposed to low-order panel methods, where the body is represented by a large number of quadrilateral panels and the velocity potential is assumed to be piecewise constant (or approximated by low degree polynomials) on each panel, the isogeometric concept is based on exploiting the same NURBS basis, used for representing exactly the body geometry, for approximating the singularity distribution (and, in

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“…The diameter of the bulbous bow was chosen based on several design parameters as suggested by Kracht (1978) [11], Wehausen (1973) [12], Tuck (1991) [21] and Roddan (1999) [13]. The summary of those results are shown in Table 1.…”

Section: Bulbous Bow For Npl5b Series Hull Formmentioning

confidence: 99%

Experimental analysis of the seakeeping performance of catamaran forms with bulbous bows

Ghani

Wilson

2018

ISP

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Abstract.This paper explores the effects of adding different forms of bulbous bows onto catamaran hulls and assesses the implications on the seakeeping performance. There has been a large body of work that assess the effect of wave wake wash and recently studies have been undertaken to determine the effects of bulbous bows on reducing wave wake wash. However, not much research has been published on the effects of bulbous bows on the seakeeping performance of catamarans fitted with bulbous bows. This paper presents experimental results that will allow a ship designer to understand the effects of bulbous bows on heave, pitch and added resistance in waves. In conclusion it ranks the importance of different bulbous bows on the seakeeping performance.Keywords. Bulbous bow,seakeeping, added resistance, heave, pitch, waves BackgroundIn recent years fast ferries which are capable of speeds in excess of 40 knots have been operational in water of depth of less than 10m. As high-speed operations near sensitive shorelines increase, complaints from the public on extensive wave wake or wake wash from these fast vessels have increased. Although the leading waves in the wash are very small in terms of wave amplitude compared to storm waves, they have a very long period and build in height rapidly in shallow water at the shoreline, thereby, causing substantial surges on beaches as well as breaching sea walls at high tide. This wake wash is likely to have environmental effects such as shoreline erosion as well as endangering swimmers and small boats. During 1997, as a consequence of public concern, the Danish Maritime Authority issued a governmental order which requires that the high-speed craft operator/owner has to show evidence that the ship-generated waves do not exceed a prescribed wave height criterion in shallow water along the entire route. Similar criteria exist for other regions, such as the Puget Sound, Seattle, some navigable inland waterways in the Netherlands and the River Thames, UK particularly the route between Southampton and the Isle of Wight), Nantucket, the Mare Island Channel and the East Bay Estuary in San Francisco Bay. The main risk to coastal communities and users of the waters in coastal areas is that the waves arrive unexpectedly and break on the shoreline often after the fast ferry is out of sight, Whittaker (2001) [7]. Shallow water dramatically increases the wash. In shallow waters, the seabed interfere with ship wave-making forcing changes to wave patterns, energy levels and vessel running condition.

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The Wave Resistance of Ships

Cited by 97 publications

References 115 publications

Wake pattern and wave resistance for anisotropic moving disturbances

Wake pattern and wave resistance for anisotropic moving disturbances

A BEM-isogeometric method for the ship wave-resistance problem

Experimental analysis of the seakeeping performance of catamaran forms with bulbous bows

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