Effects of radiation and diffraction forces on the prediction of parametric roll

Bu, Shuxia; Gu, Min; Lu, Jiang; Abdel‐Maksoud, Moustafa

doi:10.1016/j.oceaneng.2019.02.006

Cited by 15 publications

(5 citation statements)

References 13 publications

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“…The presented simulation programs all include just the linear diffraction forces. It has been suggested by Dallinga [30] and Bu et al [31] that the non-linear diffraction forces play a role in the occurrence of parametric roll events. Dallinga [30] used linear calculations on a heeled vessel to estimate non-linear diffraction effects.…”

Section: Nonlinear Diffractionmentioning

confidence: 99%

“…Dallinga [30] used linear calculations on a heeled vessel to estimate non-linear diffraction effects. Bu et al [31] used a more complicated (and more CPU-intensive) hydrodynamic model, a body-exact method, to calculate the hydrodynamic forces at each time instant using a new panelisation. They compared results of stability calculations in waves using the body-exact method to results of a linear program and a heeled vessel, similar to Dallinga.…”

Section: Nonlinear Diffractionmentioning

confidence: 99%

See 1 more Smart Citation

A Comparison of Numerical Simulations and Model Experiments on Parametric Roll in Irregular Seas

Kapsenberg

Wandji

Düz

et al. 2020

JMSE

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The recently finalised Second Generation Intact Stability Criteria (SGISC), produced by the International Maritime Organisation (IMO), contain a level 3 assessment, the so-called Direct Stability Assessment (DSA). This assessment can be carried out using either model experiments or simulations. The fact that such a choice is given implies that the methods are equivalent in accuracy. This assumption has been verified, for one case, by the Cooperative Research Ships (CRS) community. The verification was based on new model experiments and calculated results, using four different programs owned by different CRS members. Results of the verification of the parametric roll failure mode in regular waves were published before, but this study concerns results in irregular seas. The experimental and numerical results are compared in both probabilistic and deterministic manners. The probabilistic comparison showed that the simulation programs considered are sometimes conservative and sometimes non-conservative in the prediction of the probability of an extreme value. The deterministic comparison in head seas showed that parametric roll events were predicted in the simulations in a wave train that showed no sign of important roll events in the measurement. The deterministic comparison in the following seas, on the other hand, showed an accurate fit of experimental and numerical results. It is suggested that predictions could possibly be improved by adding non-linear diffraction forces to the numerical model.

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Section: Nonlinear Diffractionmentioning

confidence: 99%

Section: Nonlinear Diffractionmentioning

confidence: 99%

A Comparison of Numerical Simulations and Model Experiments on Parametric Roll in Irregular Seas

Kapsenberg

Wandji

Düz

et al. 2020

JMSE

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“…The wave scatter would facilitate to provide the probability of occurrence. The downtime cost is calculated from the following equation, Equation (9). The offloading capacity of shuttle tanker is generally less than the total storage capacity of FPSO.…”

Section: Down-time Cost Analysismentioning

confidence: 99%

“…The second order linear oscillatory system was used to model the roll angle of floating vessel. A coupled motion numerical model based on source method to study the diffraction and radiation forces on parametric roll was used in [9]. Furthermore, the effect of these forces on the roll restoring lever arm was studied under different angle of heel and wave amplitude.…”

Section: Introductionmentioning

confidence: 99%

Development of Downtime Cost Calculator for Offloading Operations Influenced by Parametric Rolling

Patel

Liew

Mustaffa

et al. 2019

JMSE

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The stability of FPSO or offloading shuttle tanker may be affected in wave conditions which excite parametric rolling. The offloading operations are thereby ceased and eventually leads to loss in production which affects the revenue of global production, better known as downtime cost. This paper discusses downtime cost analysis of offloading operations due to parametric rolling of shuttle tanker under regular waves in Malaysian waters for three different locations. The downtime due to parametric rolling is investigated for two different water depths for which the probability of occurrence was calculated from the location specific wave scatter diagram. The results of parametric rolling of shuttle tanker along with downtime cost charts are presented. Additionally, a Graphical User Interface (GUI) was developed and its work procedure is demonstrated in this paper. The down-time cost calculator will help the oil operator companies to analyze the economic risks involved for field developments and anticipate the loss in revenue for downtime occurrences. The developed GUI was copyrighted under literary work as intellectual property.

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“…Wang et al 30 developed single degree equation of roll stability for different wave group parameters. Bu et al 31 presented an integrated mathematical model to study hydrodynamic forces on rolling of ship. Sloshing as a part of hydrodynamic assessment was performed by Kang et al, 32 Kim et al, 33 and Sung Kim et al 34 on vessel tanks, in which they proposed mechanism to reduce it for safer sea transportation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic roll instability of liquid natural gas carrier during offloading operations and prediction of downtime cost in Malaysian waters

Patel¹,

Liew²,

Kang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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The loss of revenue or global loss in term of cost due to downtime conditions is always a concern for field operators. Prevailing wave conditions may suddenly appear during offloading operations, which will influence the overall process and may lead to downtime of operations. Severe weather can significantly impact downtime costs of offloading operations and cause a huge loss of revenue. This research work integrates the dynamic stability with downtime cost for LNG carrier in different location of Malaysian waters using real time metocean data. This study on downtime cost utilizes the real time and location-specific wave scatters, as well as limiting criteria of offloading in Malaysian waters. The dynamic roll stability of LNG carrier was investigated for ABS criteria in two depths of water at three real-time locations. Susceptible wave conditions had been identified along with downtime cost analysis. This domain of downtime cost study was further rendered into mathematical package in the form of graphical interfaces for field operators. This mathematical based graphical interface facilitates in predicting location-specific downtime cost charts and allows operator companies to determine the fiscal losses for different range of downtime days and various capacities of LNG carrier. Overall, this research contributes by linking dynamic stability with operating costs through real time metocean data in Malaysian waters.

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Effects of radiation and diffraction forces on the prediction of parametric roll

Cited by 15 publications

References 13 publications

A Comparison of Numerical Simulations and Model Experiments on Parametric Roll in Irregular Seas

A Comparison of Numerical Simulations and Model Experiments on Parametric Roll in Irregular Seas

Development of Downtime Cost Calculator for Offloading Operations Influenced by Parametric Rolling

Dynamic roll instability of liquid natural gas carrier during offloading operations and prediction of downtime cost in Malaysian waters

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