Roll damping decay of a FPSO with bilge keel

Avalos, Gustavo O. Guarniz; Wanderley, Juan B. V.; Fernandes, Antonio Carlos; Oliveira, Allan C. de

doi:10.1016/j.oceaneng.2014.05.008

Cited by 31 publications

(6 citation statements)

References 9 publications

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“…The numerical results have reasonable damping coefficient prediction but the period of oscillations differ from experiments by up to 4.0%. These results are in line with those presented by Gao et al (2011Gao et al ( , 2013 and Avalos et al (2014).…”

Section: Introductionsupporting

confidence: 94%

“…Detailed validation data for a Ro-Pax ship was not available, but authors compared the numerical results with Ikeda's method (1978) commenting on merits and limitations of both approaches. Avalos et al (2014) investigated a roll decay test of the middle section of a Floating Production Storage and Offloading (FPSO) ship with bilge keels by the numerical solution of the incompressible two-dimensional RANS equations. The free surface was considered flat so that the wave radiation was neglected and the simulations were focused to assessing the effect of bilge shape and three bilge keels on the damping coefficient of the FPSO section.…”

Section: Introductionmentioning

confidence: 99%

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Verification and validation of numerical modelling of DTMB 5415 roll decay

et al. 2018

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The paper presents a numerical roll damping assessment of the intact DTMB 5415 naval ship at zero speed. Free model motions from four experimental roll decays with initial heeling angle of 4.0, 13.5, 19.58 and 24.50 deg, performed previously at the University of Strathclyde, Glasgow, have been analysed and the one with 19.58 deg initial heeling has been chosen for the Computational Fluid Dynamic (CFD) analysis. All calculations are performed using CD Adapco Star CCM+ software investigating the accuracy and efficiency of the numerical approach for case of high initial heeling angle of bare hull. In the numerical procedure the verification analysis of mesh refinement and time step was performed with the aim to investigate the numerical error/uncertainty. For grid refinement and time step, validation and verification procedure has been performed according to the Grid Convergence Index (GCI) method. Moreover, to verify the main source of the modelling error/uncertainty, the effect of degrees of freedom are evaluated, comparing the numerical results with the experimental results. Conclusions are identifying best practice for roll decay simulations commenting the accuracy of numerical results and required calculation time.

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Section: Introductionsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Verification and validation of numerical modelling of DTMB 5415 roll decay

et al. 2018

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“…The effect of side keel on the roll damping of a planing hull patrol vessel was experimentally investigated by various heights, breadths, and positions of side keel (Maimun et al, 2009). Avalos et al (2014) carried out experiments and numerical calculations to study vortex shedding around bilge keel with both sharp and rounded bilges. Lee et al (2018) proposed variations of the roll reduction appendage based on increasing damping strategy.…”

Section: Introductionmentioning

confidence: 99%

Influence of bilge-keel configuration on ship roll damping and roll response in waves

et al. 2020

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“…Despite the findings by Wasserman et al [21], free roll decay test is the most widely used method [5,[22][23][24][25][26][27] because it is the recommended technique by the International Maritime Organization (IMO) [28]. There are five methods to determine the damping coefficients for the vessel roll motion from roll decay test [29]: Quasi-linear method, Froude Energy method, Roberts Energy method, Averaging method and the Perturbation method.…”

Section: Introductionmentioning

confidence: 99%

Experimental Determination of Non-Linear Roll Damping of an FPSO Pure Roll Coupled with Liquid Sloshing in Two-Row Tanks

Igbadumhe

Sallam

Fürth

et al. 2020

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Wave excited roll motion poses danger for moored offshore vessels such as Floating Production Storage and Offloading (FPSO) because they cannot divert to avoid bad weather. Furthermore, slack cargo tanks are almost always present in FPSOs by design. These pose an increased risk of roll instability due to the presence of free surfaces. The most common method of determining roll damping is roll decay tests, yet very few test have been performed with liquid cargo, and most liquid cargo experiments use tanks that span the entire width of the vessel; which is seldom the case for full scale FPSO vessels during normal operations. This paper presents a series of roll decay test carried out on a FPSO model with two two-row-prismatic tanks with different filling levels. To directly investigate the coupling between the liquid sloshing and the vessel motion, without modifying the damping, tests were performed at a constant draft. The equivalent linear roll damping coefficients consisting of linear, quadratic and cubic damping terms are analyzed for each loading condition using four established methods, the Quasi-linear method, Froude Energy method, Averaging method and the Perturbation method. The results show that the cubic damping term is paramount for FPSOs and at low filling levels, were the FPSO is more damped. Recommendations regarding the applicability of the methods, their accuracy and computational effort is given and the effect of the liquid motion on the vessel motion is discussed.

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Roll damping decay of a FPSO with bilge keel

Cited by 31 publications

References 9 publications

Verification and validation of numerical modelling of DTMB 5415 roll decay

Verification and validation of numerical modelling of DTMB 5415 roll decay

Influence of bilge-keel configuration on ship roll damping and roll response in waves

Experimental Determination of Non-Linear Roll Damping of an FPSO Pure Roll Coupled with Liquid Sloshing in Two-Row Tanks

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