The excess resistance of a ship in rough seas

Maruo, Hajime

doi:10.3233/isp-1957-43501

Cited by 55 publications

(28 citation statements)

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“…Maruo [1] derived the formula for the added resistance ( R ) but the analysis using the stationary-phase method was complicated. Kashiwagi [4] showed a simpler analysis by use of Parseval's theorem in the Fourier transform, and by extending the analysis, he also derived the formulae for the steady sway force ( Y ) and yaw moment ( N).…”

Section: Calculation Formulae For Wave-induced Steady Forces and Yaw mentioning

confidence: 99%

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Wave-induced steady forces and yaw moment of a ship advancing in oblique waves

Wicaksono

Kashiwagi

2017

J Mar Sci Technol

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Wave-induced added resistance, steady sway force, and steady yaw moment, which are of second order in the incident-wave amplitude, are studied for the forward-speed case using the far-field method based on the principles of momentum and energy conservation. The Kochin functions representing ship-disturbance waves, important input data in the far-field method, are evaluated by means of both enhanced unified theory (EUT) and new strip method (NSM) to see the difference due to bow wave diffraction, 3D and forward-speed effects in the final results of second-order steady forces and moment. Special attention is paid on the precise integration method to ensure convergence in semi-infinite integrals in the calculation formulae, introducing no artificial decaying factor unlike conventional strip-theory methods. Validation of the present calculation method is made through comparison with the experiment conducted with a bulk-carrier model advancing in regular oblique waves and motion-free condition. Good agreement between computed and measured results and also superiority of EUT to NSM are confirmed for all modes of ship motion and the steady forces and yaw moment in a wide range of wave frequency.

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Section: Calculation Formulae For Wave-induced Steady Forces and Yaw mentioning

confidence: 99%

“…Early development of the theoretical formulation for the added resistance was provided by Maruo [1] by means of the principles of momentum and energy conservation. In the calculation formula derived, the Kochin function, equivalent to the amplitude of ship-generated disturbance waves far from the ship, is needed as the input.…”

Section: Introductionmentioning

confidence: 99%

Wave-induced steady forces and yaw moment of a ship advancing in oblique waves

Wicaksono

Kashiwagi

2017

J Mar Sci Technol

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“…The quasi-linear free surface condition ( 4 ) is used in the near field and the simplified one, the classical free surface condition ( 5 ) , is used in the far field. The hull surface condition for the near field potential can also be linearized consistently based on the double-body flow as follows ( 6 ) where 7z, represents the displacement of the ship oscillation in direction j, 7), represents the derivative of nj, with respect to time, and the n-vector and m-vector are given by ( 7 ) The solutions of the near and far fields are matched on the control surface. The matching condition is naturally the continuity of the potential and its gradients ( 8 ) By applying 3-D panel method, the far field solution can be expressed by ( 9 ) in which the line-integral has been neglected, the superscript means the terms in the far field, and G* is the potential of three dimensional unsteady wave source, which satisfies the free surface condition ( 5 ) and the radiation condition.…”

Section: Mathematical Formulationmentioning

confidence: 99%

Effect of the Steady Disturbance on the Unsteady Flow around a Ship in Waves

Lin

Takaki

Iwashita

1993

J. SNAJ, Nihon zousen gakkai ronbunshu

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SummaryAn investigation on the effect of the steady disturbances on the unsteady flow of a ship in waves is made by the newly developed combined boundary-integral equation method (CBIEM) , where the radiation condition is satisfied accurately. The boundary-value problem is solved in which the doublebody flow has been accounted for consistently, and the results are compared to the experiments , as well as the results obtained by 3-D panel method with the free surface condition which only involves the uniform incoming flow. Considerable interaction between the steady disturbance and the unsteady flow is obtained, and the comparisons show that the calculations based on the double-body flow achieve better accuracy not only in the wave exciting forces and hydrodynamic coefficients, but also in the wave patterns and added wave-resistance. Therefore, CBIEM achieves a significant improvement on theoretical prediction.

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“…These methods can be classified into two main categories as far-field and near field methods. The far-field methods, introduced by Maruo (1957), are based on the energy and momentum conservation principles, where the added resistance is obtained by calculating the total rate of change in momentum flux at infinity. The near field method first introduced by Boese (1970) on the other hand uses direct hydrodynamic pressure integration over the wetted surface of the ship.…”

Section: Introductionmentioning

confidence: 99%