Experimental studies of a damaged ship section in beam sea waves

Siddiqui, Mohd Atif; Greco, Marilena; Lugni, Claudio; Faltinsen, Odd M.

doi:10.1016/j.apor.2020.102090

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…Recently, Hanssen (2019); Siddiqui et al (2018) coupled NS equations with a potential solver based on the Harmonic Polynomial Cell (HPC) method. Siddiqui et al (2018) studied the wave interaction and hydrodynamic of a damaged ship, for which they later released two experimental studies (Siddiqui et al, 2019(Siddiqui et al, , 2020.…”

Section: Overview Of Dd Coupling Methodsmentioning

confidence: 99%

Assessment of one-way coupling methods from a potential to a viscous flow solver based on domain- and functional-decomposition for fixed submerged bodies in nonlinear waves

Robaux,

Benoit

2021

Preprint

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To simulate the propagation of ocean waves and their interaction with marine structures, coupling approaches between a potential flow model and a viscous model are investigated. The aim is to apply each model at the scale where it is most appropriate and to optimize the computational resources. This first model is a fully nonlinear potential flow (FNPF) model based on the Harmonic Polynomial Cell (HPC) method, which is highly accurate for representing long distance wave propagation and diffraction effects due to the presence of the structure. The second model is a viscous CFD code, solving the Reynolds-Averaged Navier-Stokes (RANS) equations within the OpenFOAM® toolkit, more suited to represent viscous and turbulent effects in the body's vicinity. Two one-way coupling strategies are developed and compared. A domain decomposition (DD) strategy is first considered, introducing a refined mesh in the body vicinity on which the RANS equations are solved. Boundary conditions and interpolation operators from the FNPF results are developed in order to enforce values at its outer boundary in a stable and accurate manner. The second coupling strategy considers a decomposition of variables (functional decomposition, FD) on the local grid. As the FNPF simulation provides fields of variables satisfying the irrotational Euler equations, complementary velocity and pressure components are introduced as the difference between the total flow variables and the potential ones. Those complementary variables are solutions of modified RANS equations. Extensive comparisons are presented for nonlinear waves interacting with a fixed horizontal submerged cylinder of rectangular cross-section. The loads exerted on the body computed from the four simulation methods (standalone FNPF, standalone CFD, DD and FD coupling schemes) are compared with experimental data. It is shown that both coupling approaches produce an accurate representation of the loads and associated hydrodynamic coefficients (inertia and drag coefficients in horizontal and vertical directions) over a large range of incident wave steepness and Keulegan-Carpenter number, for a small fraction of the computational needed by the complete CFD simulation.

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Section: Overview Of Dd Coupling Methodsmentioning

confidence: 99%

Assessment of one-way coupling methods from a potential to a viscous flow solver based on domain- and functional-decomposition for fixed submerged bodies in nonlinear waves

Robaux,

Benoit

2021

Preprint

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“…They found that the constraints did not have a significant impact on the ship's motion response. Siddiqui et al [15,16] studied the issue of damaged ships under free attenuation, forced roll, and wave load. They discussed the impact of liquid load rate, opening size, air compression coefficient, wave height, wavelength, and other parameters on the damaged stability and the process of water entry.…”

Section: Experimental Researchesmentioning

confidence: 99%

Investigation on the Characteristic and Motion of the Damaged Cabin in Waves

Song,

Wang,

liu

et al. 2024

Preprint

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The ship flooding process is very complicated which will affect the stability and the maneuverability directly, even endangering the ship, people's lives, and property. This paper carries out the experiment and numerical investigation of cabins with openings to study the mechanism of ship flooding. Firstly, the cabin model experiment is conducted in a wave flume. A cabin experimental model with an opening has been designed and manufactured. Then the model is forced to roll in the wave flume, and the phenomenon of water entry is captured with whole conditions. Secondly, the volume of fluid (VOF) model is used to solve the Reynolds-averaged Navier-Stokes equations, as well as with the overset mesh technology is employed to calculate the process of the water entering. The cabin models with different openings are employed for the simulations. The hydrodynamic models of cabins are simulated in rolling in static water. The experimental results and numerical results are compared and analyzed, which verifies the numerical method. Finally, the damaged cabin is simulated in waves with the CFD method, and the characteristic of the damaged cabin is investigated. The water entry impacts the rolling and heaving motion of the cabin. Overall, the CFD simulations show the ability to calculate the nonlinear process of the water entry even though the more precise free surface capturing technology needs be investigated and the efficiency of the CFD method should be improved.

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“…The differences in vertical wave bending moment RAOs between intact and damaged ships are very often ignored and RAOs of the intact ship is frequently used in the safety assessment of damaged ships [19]. Forced oscillatory heave tests in calm water were carried out by varying the model-motion parameters and examining both intact and damaged conditions [20] and free-roll decay tests were performed for intact and damaged sections [21] to understand the complex and nonlinear behavior of floodwater inside a damaged ship section.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Motions Behavior of a Ferry in Waves Caused by Damaged Conditions

Baso

2021

IJMEIR

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⎯ a progressive flooding-ingress of water to a compartment of a damaged ship affects the motions of a ship. In this present study, the behavior of the motion of a ferry caused by damaged conditions in waves was investigated through the experimental work. The leakage of compartments was made into several scenarios including one, two, and three damaged compartments, and the damaged ship model was simulated in heading and beam waves. The research results show the one damaged compartment on the engine room (ER) affected extreme stern trim as well as Void No.1 affected extreme bow trim. The two damaged compartments on the water ballast tank (WBT) No.2 and Steering gear room (SGR) resulted in extreme stern trim as well as WBT No.1 and Void No.1 affected extreme bow trim. The heave, pitch, and roll responses on the damaged Void No.1 are higher comparing with the damaged ER. Also, the heave, pitch, and roll responses on damaged SGR and WTB No.2 are higher than Void No.1 and WBT No.1. The peak resonances of heave RAO on bow trim affect higher magnitude than on stern trim. Pitch or roll RAO caused by the increased bow trim or stern trim in head and beam waves has a small magnitude within the response.

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Experimental studies of a damaged ship section in beam sea waves

Cited by 16 publications

References 26 publications

Assessment of one-way coupling methods from a potential to a viscous flow solver based on domain- and functional-decomposition for fixed submerged bodies in nonlinear waves

Assessment of one-way coupling methods from a potential to a viscous flow solver based on domain- and functional-decomposition for fixed submerged bodies in nonlinear waves

Investigation on the Characteristic and Motion of the Damaged Cabin in Waves

Investigating the Motions Behavior of a Ferry in Waves Caused by Damaged Conditions

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