Head-wave parametric rolling of a surface combatant

Sadat-Hosseini, Hamid; Stern, Frederick; Olivieri, A.; Campana, Emilio F.; Hashimoto, Hirotada; Umeda, Naoya; Bulian, Gabriele; Francescutto, Alberto

doi:10.1016/j.oceaneng.2010.02.010

Cited by 36 publications

(11 citation statements)

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“…Parametric roll has been extensively studied through analytical, numerical and experimental approaches [2,4,11,20,22]. In some papers, authors explain that the steadystate roll amplitude occurs if the energy provided by the variation over time of the restoring moment is entirely dissipated by roll damping [1,3].…”

Section: An Energy Analysis Of Parametric Roll For Application To the Second Generation Intact Stability Criteriamentioning

confidence: 99%

An energy analysis of parametric roll for application to the second generation intact stability criteria

2017

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International audienceParametric roll is an amplification of the roll motion due to the periodic variation of the restoring moment in waves. This phenomenon is mostly observed in head and following seas and is the cause of several accidents occurred on container vessels during recent decades. One of the second generation intact stability criteria, currently under finalization and validation by the IMO, requires computing the maximum roll angle with regard to parametric roll. Both proposed methods are relatively complex to implement and require tools that naval architects are not accustomed to. In this paper, we propose an easier alternative method providing the amplitude of parametric roll for any loading condition at any speed, based on energy considerations and assuming a linear GZ. The implementation of this easy method in the corresponding second generation intact stability criterion provides almost the same value of KG(max) than the on-degree-of-freedom time simulation proposed by the future regulation

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Section: An Energy Analysis Of Parametric Roll For Application To the Second Generation Intact Stability Criteriamentioning

confidence: 99%

An energy analysis of parametric roll for application to the second generation intact stability criteria

2017

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“…Parametric rolling is a large amplitude roll limitcycle oscillation which is not directly excited by the waves but it is a result of a dynamic instability of the roll motion. The dynamic instability occurs due to periodic changes of transverse stability (restoring moment) in waves and happens when the ratio of the natural roll frequency to the frequency of the restoring moment variation (or wave frequency) is about ½ (Sadat- Hosseini et al, 2010). Fig.…”

Section: Intact Beam Wavesmentioning

confidence: 99%

“…Xing, T. and Stern, F., (2010), "Factors of Safety for Richardson Extrapolation", ASME Journal of fluids engineering, Vol. 132, No.…”

Section: Acknowledgementsmentioning

confidence: 99%

URANS simulations for a flooded ship in calm water and regular beam waves

et al. 2016

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CFD simulations are conducted for zero-speed damaged passenger ship SSRC in calm water and waves with 6DOF motions including flooding procedure in calm water, roll decay in calm water and motions in regular beam waves for various wavelengths. The simulations model the 6DOF soft spring experimental mount, the one-and two-room flooding compartment configurations, including both intact and damaged conditions. For flooding and roll decay, simulations show ability to predict the trend of increases in roll period and damping due to flooding, as reported in ITTC. The damping magnitudes were often under-predicted with large errors while the roll period and compartment water height were well predicted. Two-room compartment simulation showed three times larger damping than one-room compartment cases whereas the roll period was similar for both conditions. For wave cases, all motions show primarily 1st order responses, except for parametric roll condition which shows large ½ harmonic responses for the intact ship. The 2nd order responses are small for both damaged and intact ship. The larger roll period and damping for the damaged ship shift the peak of responses to smaller wave frequency and reduce the amplitude of responses. The average error is often large for 1st order intact ship pitch and damaged ship surge and pitch. The errors are larger for

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“…The behavior of the model in irregular waves is dealt with in Sadat-Hosseini et al [23]. Herein, the results are investigated with consideration to the mathematical model of 6DOF ship motions similar to the analysis performed for parametric rolling and broaching by Sadat-Hosseini et al [22,26]. The 6DOF mathematical model is based on third-order Taylor series approximation of forces and moments about an equilibrium position.…”

Section: Introductionmentioning

confidence: 99%

CFD, potential flow and system-based simulations of fully appended free running 5415M in calm water and waves

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Sadat-Hosseini

Visonneau

et al. 2018

ISP

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The seakeeping ability of ships is one of the aspects that needs to be assessed during the design phase of ships. Traditionally, potential flow calculations and model tests are employed to investigate whether the ship performs according to specified criteria. With the increase of computational power nowadays, advanced computational tools such as Computational Fluid Dynamics (CFD) become within reach of application during the assessment of ship designs. In the present paper, a detailed validation study of several computational methods for ship dynamics is presented. These methods range from low-fidelity system-based methods, to potential flow methods, to high-fidelity CFD tools. The ability of the methods to predict motions in calm water as well as in waves is investigated. In calm water, the roll decay behavior of a fully appended self-propelled free running 5415M model is investigated first. Subsequently, forced roll motions simulated by oscillating the rudders or stabilizer fins are studied. Lastly, the paper discusses comparisons between experiments and simulations in waves with varying levels of complexity, i.e. regular head waves, regular beam waves and bi-chromatic waves. The predictions for all methods are validated with an extensive experimental data set for ship motions and loads on appendages such as rudders, fins and bilge keels. Comparisons between the different methods and with the experiments are made for the relevant motions and the high fidelity CFD results are used to explain some of the complex physics. The course keeping and seakeeping of the model, the reduction rate of the roll motion, the effectiveness of the fin stabilizers as roll reduction device and the interaction of the roll motion with other motions are investigated as well. The paper shows that only high-fidelity CFD is able to accurately predict all the relevant physics during roll decay, forced oscillation and sailing in waves.

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Head-wave parametric rolling of a surface combatant

Cited by 36 publications

References 10 publications

An energy analysis of parametric roll for application to the second generation intact stability criteria

An energy analysis of parametric roll for application to the second generation intact stability criteria

URANS simulations for a flooded ship in calm water and regular beam waves

CFD, potential flow and system-based simulations of fully appended free running 5415M in calm water and waves

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