On the development of a fast modeling of floodwater effects on ship motions in waves

Acanfora, Maria; Cirillo, Antonio

doi:10.1177/1475090216687438

Cited by 5 publications

(15 citation statements)

References 28 publications

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“…The equations of motion in the time domain for a damaged ship, for six degrees of freedom (6 DoF), are extensively described in [21]. In this section, the main assumptions of the model and the current improvements are given.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Simulation time depends mainly on the panel discretization of the ship and on the time step. In the previous research [21], it was highlighted that the computational time is almost three times faster than real time (hull discretized by 56,456 panels and a time step of 0.25 s).…”

Section: Case Studiesmentioning

confidence: 99%

“…In [20,21], a novel method in simulating water flooding and its effects on ship motions was presented. It is based on the lumped mass approach, considering the inclination of a flat free-surface due to the action of the ship's lateral acceleration and thus the more accurate position of the lumped mass.…”

Section: Introductionmentioning

confidence: 99%

“…The current paper presents improvements of the method developed in [20,21], accounting for the water exchange through the damage opening in ship dynamics and accounting for longitudinal acceleration effects in the free-surface inclination.…”

Section: Introductionmentioning

confidence: 99%

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A Fast Simulation Method for Damaged Ship Dynamics

Acanfora

Begović

Luca

2019

JMSE

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Ship accidents that entail flooding may lead to disastrous consequences which could be avoided or mitigated based on the knowledge of damaged ship dynamics. The dynamic behaviour of a damaged hull is a complex phenomenon involving the interaction of the flooded water and the ship motions. The presence of a damage opening allows water flow into and out from the compartment, which further complicates the mathematical description of the problem. A fast simulation method, based on the lumped mass approach, is developed and presented. The lumped mass path in space depends on free-surface inclinations that differ from the ship angles of the roll and pitch. The viscous effects in the floodwater dynamics are implemented based on the model for the dissipation of the energy of standing waves in rectangular rooms. The method applies to both the transient stage of flooding and to the dynamic behaviour of a flooded ship in regular waves. In the first case, viscous effects are implemented considering the water in the compartment variable with time. Several case studies are carried out on three different hull models: Transient stage of flooding, roll decay of the damaged hull, and steady state responses in waves are simulated and compared with available experimental data.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Case Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Fast Simulation Method for Damaged Ship Dynamics

Acanfora

Begović

Luca

2019

JMSE

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“…It poses a great challenge for these factors being considered properly and implemented in a numerical method. [28][29][30] The meshless smoothed particle hydrodynamics (SPH) method [31][32][33][34] has advantages to deal with the nonlinear interaction with large free-surface deformation, 35,36 violent impact, 37,38 and other nonlinear phenomena. 39,40 A wide validation of the SPH model against different sloshing flow conditions was conducted.…”

Section: Article Scitationorg/journal/phfmentioning

confidence: 99%

Smoothed particle hydrodynamics (SPH) model for coupled analysis of a damaged ship with internal sloshing in beam seas

et al. 2019

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The flooding of a damaged ship in waves is a complex process, often coupled with the internal and external liquid motion together with the ship hull motion. Paramount to the operation safety, in order to improve the prediction accuracy of ship motion during the flooding process, the strip theory is applied to study the dynamic response of the damaged ship in beam seas; a smoothed particle hydrodynamics (SPH) model is developed to consider the coupling effects of various factors including internal sloshing of intact cabins and damaged cabins and external waves. The numerical wave tank with a perfectly matched layer absorbing boundary condition is established and validated by the experimental results. The detailed sensitivity study is carried out focusing on the effects of damaged opening sizes, the relative position of opening, and the incident wave and the liquid loading conditions on the dynamic response of the damaged ship in regular beam waves. It is observed that the flooding process was slowed down and interrupted by the water exchanges at the damaged opening due to the dynamic motion. Compared with the opening facing the incident wave, the back one endangered the ship pronouncedly with large amplitude and frequency roll motion. It is also revealed that the liquid tank in the damaged ship imposes a significant influence on its rolling response. It is further demonstrated that the present SPH model is capable of handling the nonlinear phenomenon in a flooding process of a damaged ship.Published under license by AIP Publishing. https://doi.

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Marine environment numerical simulation of morphological planning of land reclamation

Zhang

Jiang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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Based on the evaluation criteria of the impact of different types of reclamation design on the natural environment of coastal waters, the environmental fluid dynamics model was used to simulate the seawater environment in 13 scenarios from three aspects: the shape of the artificial island, the size of inner lake outlet and the layout of the artificial island. The hydrodynamic force and water exchange capacity of these islands were quantitatively compared, and the effects of different artificial islands on the Marine environment were summarized. The planning morphology design guidelines are summarized in four aspects: (1) reduce the serrated steep slope shoreline, avoid forming semi-closed water, and increase the simple and smooth shoreline; (2) reduce the width of the lake mouth to increase the length of the lake; (3) choose a simple alignment parallel to the shore; (4) the design mainly focuses on the morphology of shoreline, followed by consideration of the lake mouth and artificial island arrangement.

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On the development of a fast modeling of floodwater effects on ship motions in waves

Cited by 5 publications

References 28 publications

A Fast Simulation Method for Damaged Ship Dynamics

A Fast Simulation Method for Damaged Ship Dynamics

Smoothed particle hydrodynamics (SPH) model for coupled analysis of a damaged ship with internal sloshing in beam seas

Marine environment numerical simulation of morphological planning of land reclamation

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