Hydroelasticity of marine vessels advancing in a seaway

Das, Suvabrata; Cheung, Kwok Fai

doi:10.1016/j.jfluidstructs.2012.05.015

Cited by 35 publications

(4 citation statements)

References 36 publications

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“…In addition, the desingularized Rankine panel method is only applied for the cases of Brard number τ larger than 0.25, where the radiation condition is satisfied by the staggered method. For τ < 0.25, more robust methods for satisfying the radiation condition, such as the modified Sommerfeld radiation condition in [24,25], should be adopted. These will be the focuses of the future studies.…”

Section: Discussionmentioning

confidence: 99%

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Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave

Mei

Candries

Lataire

et al. 2020

JMSE

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In this paper, an improved potential flow model is proposed for the hydrodynamic analysis of ships advancing in waves. A desingularized Rankine panel method, which has been improved with the added effect of nonlinear steady wave-making (NSWM) flow in frequency domain, is employed for 3D diffraction and radiation problems. Non-uniform rational B-splines (NURBS) are used to describe the body and free surfaces. The NSWM potential is computed by linear superposition of the first-order and second-order steady wave-making potentials which are determined by solving the corresponding boundary value problems (BVPs). The so-called m j terms in the body boundary condition of the radiation problem are evaluated with nonlinear steady flow. The free surface boundary conditions in the diffraction and radiation problems are also derived by considering nonlinear steady flow.To verify the improved model and the numerical method adopted in the present study, the nonlinear wave-making problem of a submerged moving sphere is first studied, and the computed results are compared with the analytical results of linear steady flow. Subsequently, the diffraction and radiation problems of a submerged moving sphere and a modified Wigley hull are solved. The numerical results of the wave exciting forces, added masses, and damping coefficients are compared with those obtained by using Neumann-Kelvin (NK) flow and double-body (DB) flow. A comparison of the results indicates that the improved model using the NSWM flow can generally give results in better agreement with the test data and other published results than those by using NK and DB flows, especially for the hydrodynamic coefficients in relatively low frequency ranges.

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Section: Discussionmentioning

confidence: 99%

“…The modified Sommerfeld radiation condition [24,25]: the modified Sommerfeld radiation condition is adopted by taking account the Doppler shift of the scattered waves at the control surface that truncates the infinite fluid domain.…”

mentioning

confidence: 99%

Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave

Mei

Candries

Lataire

et al. 2020

JMSE

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“…. Das & Cheung (2012) presented a directly coupled hydroelastic approach in the frequency domain with a rigorous treatment of the vessel forward speed. The formulation adopts a translating coordinate system with the free surface boundary conditions accounting for the double-body flow around the vessel and the radiation condition taking into account the Doppler shift of the scattered waves.…”

Section: Hydroelasticity Methodsmentioning

confidence: 99%

Prediction of wave-induced loads on ships: Progress and challenges

et al. 2016

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The aim of this paper is to critically assess the methods used for the evaluation of wave-induced loads on ships examining analytical, numerical and experimental approaches. The paper focuses on conventional ocean going vessels and loads originating from steady state and transient excitations, namely slamming, sloshing and green water, for the latter, and including extreme or rogue waves, as well as the more occasional loads following damage. The advantages and disadvantages of the relatively simpler potential flow approaches against the more time consuming CFD methods are discussed with reference to accuracy, modelling nonlinear effects, ease of modelling and of coupling with structural assessment procedures, suitability for long term response prediction and suitability for integration within design and operational decision making. The paper also assesses the uncertainties involved in predicting wave-induced loads and the probabilistic approaches used for the evaluation of long term response and fatigue analysis. The current design practice is reviewed and the role of numerical prediction methods within the classification framework and goal based design approach discussed. Finally the suitability of current developments in prediction methods to meet the needs of the industry and future challenges is assessed.

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“…The complex fluid structure interaction present during slam events often necessitates the separation of the fluid and structural solutions. This requires assumptions to be made over the nature of the fluid forcing and can lead to significant errors in the predicted slam loads and structural stresses (Das and Cheung, 2012). In order to accurately capture the non-linearity present during slam conditions, numerical simulations are receiving increased attention (Castiglione et.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slam Force Duration on the Vibratory Response of a Lightweight High-Speed Wave-Piercing Catamaran

McVicar¹,

Lavroff²,

Davis³

et al. 2015

Journal of Ship Research

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When the surface of a ship meets the water surface at an acute angle with a high relative velocity, significant short duration forces can act on the hull plating. Such an event is referred to as a slam. Slam loads imparted on ships are generally considered to be of an impulsive nature. As such, slam loads induce vibration in the global hull structure which has implications for both hull girder bending strength and fatigue life of a vessel. A modal method is often used for structural analysis whereby higher order modes are neglected to reduce computational effort.

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Hydroelasticity of marine vessels advancing in a seaway

Cited by 35 publications

References 36 publications

Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave

Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave

Prediction of wave-induced loads on ships: Progress and challenges

Effect of Slam Force Duration on the Vibratory Response of a Lightweight High-Speed Wave-Piercing Catamaran

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