An experimental investigation into the influence of the damage openings on ship response

Acanfora, Maria; Luca, Fabio De

doi:10.1016/j.apor.2016.03.003

Cited by 26 publications

(19 citation statements)

References 11 publications

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“…In Figure 8, the numerical roll decay test of the flooded ship reported in the model scale is compared against the corresponding experimental data. The numerical simulation (blue continuous line) matches the roll period of the flooded ship [24] and the rapid decay of the first two cycles. However, it does not feature a re-amplification of the roll motion as observable from the experimental data (black dotted line).…”

Section: Roll Decay Simulations and Roll Response In Beam Waves On Thmentioning

confidence: 63%

“…The accuracy of the numerical model was exanimated for three different hull models: A barge, a passenger ferry, and a frigate, DTMB 5415 (see main data in Tables 1 to 3, respectively), in different flooding conditions. For these hulls, experimental data and model geometry are available [23][24][25].…”

Section: Case Studiesmentioning

confidence: 99%

“…The method applies both to the transient stage and to the steady-state stage of flooding [22]. Therefore, case studies are carried out for three hulls involving different damage simulations: A barge dealing with transient flooding [23]; a damaged ferry in a steady state that exhibits two frequency modes [24]; and a damaged frigate dealing with steady state dynamics in head and beam waves [25]. The comparison with the available experimental data [23][24][25] highlights the pros and cons of the fast model, according to the simulated damage cases and comments on the obtained accuracy.…”

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: Roll Decay Simulations and Roll Response In Beam Waves On Thmentioning

confidence: 63%

Section: Case Studiesmentioning

confidence: 99%

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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“…This can give unpredictable roll response. Acanfora and Luca (2016) conducted experiments on damaged vessels in still water to find roll response in beam waves. Side and bottom damage was investigated, which generated greater roll damping.…”

Section: Review Of Previous Workmentioning

confidence: 99%

Stability Assessment of Drill Ship Using Probabilistic Damage Stability Analysis

Mohan

Shashikala

2019

ToMS

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Drill ship is a ship-shaped structure with a drilling unit at its center and with oil compartments, which is moored and kept in position using anchors. These ships should be capable of working in deep sea for a long time, hence affected by harsh ocean environment. Drill units are said to have greater heave motion, and the height of the derrick influences the vessel’s stability. MARPOL Oil Outflow Analysis is performed for damaged crude oil carriers or tankers and Mobile offshore drilling units (MODU) in damaged condition. In the present study, probabilistic analysis is performed on drill ship to understand its stability behavior under damaged condition. Stability assessments are carried out by considering single and multiple damage locations. Oil outflow analysis is carried out for different damage cases of oil tank. Probabilistic damage assessment is done for load cases up to 50% flooding, to obtain stability charts. These charts will be useful to understand variations in stability parameters under damaged conditions.

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“…An experimental campaign was carried out on a passenger ferry hull to underline the effects of the damage opening on the ship roll response. The damaged ship was placed in still water and beam regular waves at zero speed [5]. Lim et al [6] used a course-keeping model ship to measure the advance speed and motion response of the damaged ship in head and following seas.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation into the Effect of Damage Openings on Ship Hydrodynamics by the Overset Mesh Technique

Zhang

Lin

Mancini

et al. 2019

JMSE

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Damage stability is difficult to assess due to the complex hydrodynamic phenomena regarding interactions between fluid and structures. Therefore, a detailed analysis of the flooding progression and motion responses is important for improving ship safety. In this paper, numerical simulations are performed on the damaged DTMB 5415 ship at zero speed. All calculation are carried out using CD Adapco Star CCM + software, investigating the effect of damage openings on ship hydrodynamics, including the side damage and the bottom damage. The computational domain is modelled by the overset mesh and solved using the unsteady Reynold-average Navier-Stokes (URANS) solver. An implicit solver is used to find the field of all hydrodynamics unknown quantities, in conjunction with an iterative solver to solve each time step. The Volume of Fluid (VOF) method is applied to visualize the flooding process and capture the complex hydrodynamics behaviors. The simulation results indicated that two damage locations produce the characteristic flooding processes, and the motion responses corresponding to the hydrodynamic behaviors are different. Through comparative analysis, due to the difference between the horizontal impact on the longitudinal bulkhead and the vertical impact on the bottom plate, the bottom damage scenario always has a larger heel angle than the side damage scenario in the same period. However, the pitch motions are basically consistent. Generally, the visualization of the flooding process is efficient to explain the causes of the motion responses. Also, when the damage occurs, regardless of the bottom damage or the side damage, the excessive heel angle due to asymmetric flooding is often a threat to ship survivability with respect to the pitch angle.

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An experimental investigation into the influence of the damage openings on ship response

Cited by 26 publications

References 11 publications

A Fast Simulation Method for Damaged Ship Dynamics

A Fast Simulation Method for Damaged Ship Dynamics

Stability Assessment of Drill Ship Using Probabilistic Damage Stability Analysis

Numerical Investigation into the Effect of Damage Openings on Ship Hydrodynamics by the Overset Mesh Technique

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