Ship Wave Resistance by Final Root Method of Solution with Corrections of Block Coefficient and Angle of Entrance

2022 ◽  
pp. 111-119
Author(s):  
Md. Salim Kamil ◽  
Iwan Zamil Mustaffa Kamal ◽  
Muhammad Fauzan Misran
Keyword(s):  
Wave Resistance ◽  
Ship Wave ◽  
Method Of Solution

Quasi-linear theory of waves and ship wave resistance in restricted waters

2004 ◽  
Vol 31 (10) ◽  
pp. 1231-1244 ◽  
Author(s):  
Eduard Amromin ◽  
Svetlana Kovinskaya ◽  
Igor Mizine
Keyword(s):  
Linear Theory ◽  
Wave Resistance ◽  
Ship Wave

A Slender-Ship Theory of Wave Resistance

1983 ◽  
Vol 27 (01) ◽  
pp. 13-33
Author(s):  
Francis Noblesse
Keyword(s):  
Froude Number ◽  
Wave Resistance ◽  
Successive Approximations ◽  
Zeroth Order ◽  
Remarkable Effect ◽  
Ship Wave ◽  
First Order ◽  
Wigley Hull ◽  
Low Froude Number ◽  
The Waves

A new slender-ship theory of wave resistance is presented. Specifically, a sequence of explicit slender-ship wave-resistance approximations is obtained. These approximations are associated with successive approximations in a slender-ship iterative procedure for solving a new (nonlinear integro-differential) equation for the velocity potential of the flow caused by the ship. The zeroth, first, and second-order slender-ship approximations are given explicitly and examined in some detail. The zeroth-order slender-ship wave-resistance approximation, r(0) is obtained by simply taking the (disturbance) potential, ϕ, as the trivial zeroth-order slender-ship approximation ϕ(0) = 0 in the expression for the Kochin free-wave amplitude function; the classical wave-resistance formulas of Michell [1]2 and Hogner [2] correspond to particular cases of this simple approximation. The low-speed wave-resistance formulas proposed by Guevel [3], Baba [4], Maruo [5], and Kayo [6] are essentially equivalent (for most practical purposes) to the first-order slender-ship low-Froude-number approximation, rlF(1), which is a particular case of the first-order slender-ship approximation r(1): specifically, the first-order slender-ship wave-resistance approximation r(1) is obtained by approximating the potential ϕ in the expression for the Kochin function by the first-order slender-ship potential ϕ1 whereas the low-Froude-number approximation rlF(1) is associated with the zero-Froude-number limit ϕ0(1) of the potentialϕ(1). A major difference between the first-order slender-ship potential ϕ(1) and its zero-Froude-number limit ϕ0(1) resides in the waves that are included in the potential ϕ(1) but are ignored in the zero-Froude-number potential ϕ0(1). Results of calculations by C. Y. Chen for the Wigley hull show that the waves in the potential ϕ(1) have a remarkable effect upon the wave resistance, in particular causing a large phase shift of the wave-resistance curve toward higher values of the Froude number. As a result, the first-order slender-ship wave-resistance approximation in significantly better agreement with experimental data than the low-Froude-number approximation rlF(1) and the approximations r(0) and rM.

Near Field Expression of Ship Wave Resistance by Yeung’s Method

2017 ◽  
Author(s):  
Takashi Tsubogo
Keyword(s):  
Green Function ◽  
Boundary Value Problem ◽  
Water Pressure ◽  
Near Field ◽  
Field Method ◽  
Wave Resistance ◽  
Alternative Methods ◽  
Far Field ◽  
Ship Wave ◽  
Direct Pressure

The ship wave resistance can be evaluated by two alternative methods after solving the boundary value problem. One is the far field method e.g. Havelock’s formula, and another is the near field method based on direct pressure integration over the wetted hull surface. As is well known, there exist considerable discrepancies between wave resistance results by far field method and by near field method. This paper presents a Lagally expression in consistency with Havelock’s formula. In order to derive the Lagally expression, the symmetry of Havelock’s Green function is used in the same manner as Yeung et al (2004). Another expression to examine the relation with water pressure integrations or to ensure physical consistency is also derived by slightly deforming that expression. Some numerical comparisons of wave resistance of Wigley, KCS and KVLCC2 models among by Havelock’s formula, some direct pressure integration methods and present two new near field expressions, are shown to demonstrate consistency numerically.

scholarly journals Side-Wall Effects on ship Wave Resistance

1957 ◽  
Vol 1957 (92) ◽  
pp. 29-43
Author(s):  
Takao Inui ◽  
Masatoshi Bessho
Keyword(s):  
Side Wall ◽  
Wave Resistance ◽  
Wall Effects ◽  
Ship Wave

Simple Calculation of Sheltering Effect on Ship-Wave Resistance and Bulbous Bow Design

1980 ◽  
Vol 24 (04) ◽  
pp. 232-243
Author(s):  
B. Yim
Keyword(s):  
Free Surface ◽  
Simple Calculation ◽  
Wave Resistance ◽  
Beam Length ◽  
Ship Wave ◽  
Surface Pressure Distribution ◽  
Wigley Hull ◽  
Bulbous Bow ◽  
Sheltering Effect ◽  
Optimum Volume

The sheltering effect on the ship wave resistance is treated by the free-surface pressure distribution inside the ship. The theory is developed and the numerical values of wave resistance are obtained for parabolic and sinusoidal hulls. The corrected wave resistance is shown to be reduced more than 20 percent from the Michell's wave resistance even for a Wigley hull with beam-length ratio 0.1. However, the humps and hollows of wave resistance still remain with the magnitude closer to the experimental results. The optimum volume of bulb for sinusoidal ships is also shown to be reduced from 7.6 percent to 18 percent of the values without sheltering effect for the range of Froude numbers from 0.15 to 0.35.

Effect of Initial Acceleration on Ship Wave Pattern and Wake Survey Methods

1977 ◽  
Vol 21 (04) ◽  
pp. 239-247
Author(s):  
S. Calisal
Keyword(s):  
Survey Methods ◽  
Wave Pattern ◽  
Wave Resistance ◽  
Acceleration Wave ◽  
Ship Wave ◽  
Initial Acceleration ◽  
Wake Survey

Wave resistance calculations based on wave survey methods assume a constant ship velocity. The possible effects of initial acceleration are studied for different wave survey methods, and a procedure for determining the existence of an initial acceleration wave is proposed.

Quasi-Linear Theory of Ship Wave Resistance and CFD Analysis of Ship’s Environmental Impact

2003 ◽  
Author(s):  
Eduard Amromin ◽  
Svetlana Kovinskaya ◽  
Marina Mizina ◽  
Igor Mizine
Keyword(s):  
Environmental Impact ◽  
Linear Theory ◽  
Nonlinear Waves ◽  
Wave Amplitude ◽  
Wave Resistance ◽  
Shallow Waters ◽  
Cfd Analysis ◽  
Test Results ◽  
Ship Wave ◽  
Stokes Waves

Quasi-linear theory (QLT) introduces corrections to the Havelock integral and makes it possible to operate with realistic wave amplitudes and length into framework of linear theory. These corrections for wave amplitude and length are based on implicit employment of the model 2D problems for nonlinear waves of highest magnitude (Stokes waves). There is both description of algorithms and comparison with towing test results for diverse ships here. A substantially novel (and environmentally important) aspect of this paper is application of QLT to computation of ship wave resistance in shallow waters.

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