Verification and validation of numerical modelling of DTMB 5415 roll decay

Mancini, Simone; Begović, Ermina; Day, Sandy; Incecik, Atilla

doi:10.1016/j.oceaneng.2018.05.031

Cited by 48 publications

(15 citation statements)

References 21 publications

(23 reference statements)

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“…The time-step uncertainties as a percentage of timestep 1 (T1), for roll, pitch and heave RMS are, 7.00%, 7.41%, and 1.21%, respectively as shown in Table 5. Mancini et al (2018) also applied CF and GCI verification procedures on CFD modeling of DTMB5415 roll decay for a scaled model. In their work, roll motion grid uncertainty is 16.99% and time-step uncertainty is 0.88%.…”

Section: Verificationmentioning

confidence: 99%

Time Domain Simulation of Ship Motion in Irregular Oblique Waves

Mousavi¹,

Khoogar²,

Ghassemi³

2020

JAFM

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Ship harmonic motion is an important and practical characteristic in ship design and performance evaluation. The development and optimization of hull-form, ship's dynamic effects, seakeeping performance, and motion control, all require the motion data that includes wave exciting forces as well as dynamic response of the ship. This paper presents a new approach for time-domain simulation of full-scale ship model with four degrees of freedom based on computational fluid dynamics using unsteady RANS method. The key objective of this paper was the full-scale simulation of ship motion in oblique waves and assessment of time domain forces, moments, and other motion parameters. The David Taylor Model Basin (DTMB) 5415 full-scale model has been used for the numerical studies in this paper. The obtained computational results showed good conformation to the results obtained using the strip theory. It is intended to extend this research to subscale test experiments for more definite validation of the results.

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Section: Verificationmentioning

confidence: 99%

Time Domain Simulation of Ship Motion in Irregular Oblique Waves

Mousavi¹,

Khoogar²,

Ghassemi³

2020

JAFM

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“…The interface mentioned here is the surface of the cylinder block. According to the Mancini et al [29], Handschel et al [30], and the available ITTC recommended procedure and guidelines [31], the dimensions of the background region and the overset region are summarized in Table 3. The background region is usually designed in compliance with the "Practical Guidelines for Ship CFD Application" [31].…”

Section: Simulation Domain and Physical Modelsmentioning

confidence: 99%

“…The wall function approach is used for the near-wall treatment, in particular, the All wall Y + model. This approach is formulated to assure reasonable answers for meshes of intermediate resolution and is considered as the best compromise between description of the boundary layer with acceptable quality and the time required for the calculation [29]. The wall y + is a non-dimensional distance similar to the local Reynolds number, often used in CFD to describe how coarse or fine a mesh is for a particular flow [38].…”

Section: Near-wall Treatmentmentioning

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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“…After comprehensive consideration of previous research results [23,24] and the case of the KRISO Container Ship (KCS) with a rudder [25], the appropriate boundary types and solver settings in this paper are concluded in Table 4. By default, prism layers are not created for inlet, outlet, and symmetry boundaries.…”

Section: Numerical Set Upmentioning

confidence: 99%

Time Domain Simulation of Damage Flooding Considering Air Compression Characteristics

Zhang¹,

Lin²,

Li³

et al. 2019

Water

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An accurate analysis of the entire flooding process is critical to assess the damaged stability when a ship encounters distressed accidents such as collision, stranding, or grounding. Among many factors affecting the flooding process and damaged stability, the complex effect of air compression is significant and worthy of further research. In this paper, through establishing scenarios of the damage flooding for a cruise ship, the commercial software CD Adapco STARCCM+ is applied to perform time domain simulation of flooding processes under different ventilation levels. The basic mathematical models about air compression and specific simulation settings of computational fluid dynamics (CFD) are presented in detail. The simulation results show that water ingression results in an increase of air pressure and density inside the flooded compartment. The corresponding air compression can significantly delay the flooding process if the ventilation level is limited to a certain ratio. Finally, the stability of the damaged ship is affected.

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Verification and validation of numerical modelling of DTMB 5415 roll decay

Cited by 48 publications

References 21 publications

Time Domain Simulation of Ship Motion in Irregular Oblique Waves

Time Domain Simulation of Ship Motion in Irregular Oblique Waves

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

Time Domain Simulation of Damage Flooding Considering Air Compression Characteristics

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