Numerical study on green water and slamming loads of ship advancing in freaking wave

Liu, Dianyong; Li, Fuzhen; Liang, Xiao

doi:10.1016/j.oceaneng.2022.111768

Cited by 10 publications

(5 citation statements)

References 33 publications

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“…(FEA) solvers [12]. Furthermore, the simulation of green water and the slamming loads of ships shows that high-frequency components of the freak waves have a significant impact on the frequencies of peak pressure in the bow and deck area [13]. After finding ways to perform the simulation, people were able to predict water-slamming loads in different situations.…”

Section: Experiments Model Designmentioning

confidence: 99%

“…For example, using CFD-FEA is a possible way to simulate the slamming and the green water loads on a sailing ship, and it is a method that combines computational fluid dynamics (CFD) and finite element analysis (FEA) solvers [12]. Furthermore, the simulation of green water and the slamming loads of ships shows that high-frequency components of the freak 2 of 20 waves have a significant impact on the frequencies of peak pressure in the bow and deck area [13]. After finding ways to perform the simulation, people were able to predict waterslamming loads in different situations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact Force Mechanism of a Trimaran Model and Its Experimental Validation

Li,

Sun

2023

Applied Sciences

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In recent years, trimarans have been used in high-speed transport and in warships, but studies of them have made little progress. We designed a trimaran model and used it to perform a water-entry experiment to find a way to reduce the slamming pressure. The process of the model entering the water was divided into several steps, and different theoretical models were designed for each step, together with their force analysis. Relying on our experimental platform, we designed three flexible coating thicknesses and six drop heights as the different working conditions. With an analysis of the results under these experimental conditions, the experiment clearly indicates that the flexible cladding on the model can decrease the impact force when the model slams into water. Furthermore, the theoretical models and their corresponding force analyses are validated by the experimental results.

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Section: Experiments Model Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact Force Mechanism of a Trimaran Model and Its Experimental Validation

Li,

Sun

2023

Applied Sciences

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“…The slamming areas subjected to green-water wave loads lack a clear definition among classification societies across various countries. Zhang et al [23] and Liu et al [24] conducted research on the slamming load characteristics from the bow to the superstructure area. According to the guidelines of DNV [53], BV [54], GL [55], and KR [56], the impact zone of the bow flare and bottom is situated at a range of 0.1 L from the FP (forward perpendicular) [29,57].…”

Section: Modelling Of the Ship Bow Structuresmentioning

confidence: 99%

“…Zhang et al [23] studied the wave height, deck pressure, and superstructure pressure of a fixed FPSO under the influence of freak waves. Liu et al [24] investigated the mechanism and impact form of green water events under the influence of freak waves, and analyzed the ship's motion response, water variation and pressure. Wang et al [25] discussed the relationship between ship motion response and green water events under the influence of freak waves, and the effect of ship speed on wave-ship interaction, revealing the impact of freak-wave peaks and sequences on roll, heave, and impact pressure.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Green-Water Loads and Structural Responses of Ship Bow Structures Caused by Freak Waves

Zhang

Qin

et al. 2023

Applied Sciences

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In recent decades, freak waves, characterized by their unusual high amplitude, sharp crest, and concentrated energy, have attracted researchers’ attention due to their potential threat to marine structures. Green-water loads caused by freak waves can be significant and may lead to local damage to the ship structures. Therefore, this paper focuses on the study of green-water loads and examines the structural responses of ship bow structures under the influence of the green-water loads caused by freak waves. Firstly, a three-dimensional numerical wave tank is established in which the superposition model is used to generate freak waves. Validations on the freak-wave generation, ship motion response and the wave loading are carried out to verify the present solvers. The simulation on the interaction between the freak wave and the ship are conducted to obtain the interaction process and green-water loads. Secondly, a finite element (FEM) model of the ship bow is built, on which the green-water loads are applied to calculate the structural responses. Finally, the displacement and stress of the deck and breakwater structures are analyzed. It is found that green water events caused by freak waves can generate enormous impact forces on the bow deck and breakwater, resulting in severe structural responses and even possible damage to the structures. The local strength of structures under freak waves needs to be considered in practical engineering applications.

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“…By comparing simulated freak waves with the sea state of Japan and freak waves recorded in the laboratory, the effectiveness of the probability based superposition model is verified. Liu (Liu et al, 2022) simulated the green water and slamming loads of ship advancing in freaking wave by using the finite volume method as a CFD analysis method. To verify the accuracy of the numerical simulation method, the physical experiments and numerical simulation in the regular waves were compared, at the same time, the numerical simulation values and theoretical values of freak waves also were compared.…”

Section: Introductionmentioning

confidence: 99%