Benchmark study of global linear wave loads on a container ship with forward speed

Parunov, Joško; Soares, C. Guedes; Hirdaris, Spyros; Iijima, Kazuhiro; Wang, Xueliang; Brizzolara, Stefano; Qiu, Wei; Mikulić, Antonio; Wang, Shan; Abdelwahab, H.S.

doi:10.1016/j.marstruc.2022.103162

Cited by 24 publications

(7 citation statements)

References 26 publications

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“…The results of a benchmark study, organised by the ISSC-ITTC Joint Committee, on global linear wave loads on a container ship with forward speed has been presented in Parunov et al (2022). The objective of the study was to assess the uncertainty in linear transfer functions due to different seakeeping codes and consequences on long-term extreme vertical wave bending moments.…”

Section: Article Highlightsmentioning

confidence: 99%

Experimental Study on the Effect of Extreme Waves on a LNG Carrier

Klein

Wang

Clauss

et al. 2023

J. Marine. Sci. Appl.

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This paper presents a comprehensive experimental study on the effect of extreme waves on a LNG carrier. The LNG carrier model was equipped with a variety of sensors to measure motions, green water height on deck as well as local and global loads. Experiments in transient wave packets provided the general performance in waves in terms of response amplitude operators and were accompanied by tests in regular waves with two different wave steepness. These tests allowed detailed insights into the nonlinear behavior of the vertical wave bending moment in steep waves showing that green water on deck can contribute to a decrease of vertical wave bending moment. Afterwards, systematic model tests in irregular waves were performed to provide the basis for statistical analysis. It is shown that the generalized extreme value distribution model is suitable for the estimation of the extreme peak values of motions and loads. Finally, model tests in tailored extreme wave sequences were conducted comparing the results with the statistical analysis. For this purpose, analytical breather solutions of the nonlinear Schrödinger equation were applied to generate tailored extreme waves of certain critical wave lengths in terms of ship response. Besides these design extreme waves, the LGN carrier was also investigated in the model scale reproduction of the real-world Draupner wave. By comparing the motions, vertical wave bending moment, green water column and slamming pressures it is concluded that the breather solutions are a powerful and efficient tool for the generation of design extreme waves of certain critical wave lengths for wave/structure investigations on different subjects.

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Section: Article Highlightsmentioning

confidence: 99%

Experimental Study on the Effect of Extreme Waves on a LNG Carrier

Klein

Wang

Clauss

et al. 2023

J. Marine. Sci. Appl.

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“…In addition to proposing a new uncertainty measure, this paper presents a code-based quantified uncertainty assessment of the motions and sectional loads caused by regular wave action on a fast container ship. It is part of a larger benchmark study that was carried out within the scope of the ISSC-ITTC joint committee on uncertainty modelling in waves and wave-induced responses [70].…”

Section: Kim and Kimmentioning

confidence: 99%

“…With a full set of model test measurements necessary for comparisons publicly accessible in the literature [88,89], the container ship Flokstra is selected for this study, as in [70]. Figure 1 depicts the ship's body plan, and Table 1 provides a summary of the characteristics of the investigated full-scale ship.…”

Section: Comparative Study 21 Model Tests and Mass Distributionmentioning

confidence: 99%

“…The majority of the aforementioned comparative studies, however, relied solely on visual comparisons of results or a single uncertainty measure. Parunov et al [70] conducted a benchmark study based on fifteen numerical seakeeping codes provided by seven institutions. The benchmark study presented a theory-based quantified uncertainty assessment for the Flokstra ship's heave and pitch motions at the centre of gravity, as well as vertical bending moments at amidship.…”

Section: Introductionmentioning

confidence: 99%

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A New Model Uncertainty Measure of Wave-Induced Motions and Loads on a Container Ship with Forward Speed

Abdelwahab

Wang

Parunov

et al. 2023

JMSE

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A new uncertainty quantifier is presented for linear transfer functions of wave-induced ship motions and loads obtained by various seakeeping codes. The numerical simulations are conducted for the high-speed Flokstra container ship in regular waves at various heading angles, and the results are compared with existing experimental data. The study employs five numerical codes that are based on three different seakeeping theories, namely strip theory, 3D frequency-domain method, and 3D time-domain method. Multiple measures are applied to quantify the uncertainty in the calculated transfer functions, such as frequency-independent model error, coefficient of determination, and the total difference. In addition, a new measure of uncertainty, termed modified total difference, is proposed for determining the uncertainty of individual seakeeping codes based on experimental data rather than the mean of results obtained by numerical codes. Results show that the uncertainty measures can identify differences between the codes. The predicted wave-induced loads have higher uncertainties compared to motions. The uncertainty assessment shows that none of the applied codes can produce accurate estimates for all wave-induced motions and loads at all heading angles at the same time.

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“…The analysis is performed for vertical motions, vertical and horizontal global wave load components, and torsional moments. In addition to Parunov et al [18] a study was conducted to assess the level of doubt in linear transfer functions caused by various seakeeping codes and how that uncertainty aff ects extreme vertical wave bending moments over a long period. For each technique average regarding the scientifi c results, uncertainty estimates are computed for each seakeeping code about the average of the associated method.…”

Section: Introduction / Uvod *mentioning

confidence: 99%

Experimental Seakeeping and Uncertainty Analysis of Benchmark Ship Model in Regular Head and Beam Waves

Rizal¹,

Sari²,

Cahyono³

et al. 2023

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Confidence levels of the seakeeping experiment results can be assessed through uncertainty analysis. The seakeeping experiments with a free-running model system were carried out in the manoeuvring and ocean engineering basin (MOB) at the Indonesian Hydrodynamic Laboratory (IHL) using uncertainty techniques to improve the experiment quality. The method used is the International Organization for Standardization, Guide for Uncertainty of Measurements (ISO-GUM), type A and B uncertainty, which is the foundation for the uncertainty analysis for seakeeping experiment recommendations released by the International Towing Tank Conference (ITTC). This research aims to determine the combined uncertainty value of the seakeeping experiment on a benchmark ship model with a scale of 1:62, representing the full scale of 186 meters. Seakeeping testing is carried out under head and beam waves, each with regular waves at one wave height (Hs) with three different wave periods (Tw). The experimental seakeeping result, generally, has the same tendency in each heave, pitch, and roll motion mode. The expanded uncertainty with 95% confidence level of the RAO-Heave uncertainty in all period conditions is always less than 3%, RAO-Pitch uncertainty in all period conditions is always less than 1%, and RAO-Roll uncertainty in all period conditions is always less than 1.2%. These uncertainties are quite small.

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Benchmark study of global linear wave loads on a container ship with forward speed

Cited by 24 publications

References 26 publications

Experimental Study on the Effect of Extreme Waves on a LNG Carrier

Experimental Study on the Effect of Extreme Waves on a LNG Carrier

A New Model Uncertainty Measure of Wave-Induced Motions and Loads on a Container Ship with Forward Speed

Experimental Seakeeping and Uncertainty Analysis of Benchmark Ship Model in Regular Head and Beam Waves

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