Verification and Validation of CFD Simulations With Full-Scale Ship Speed/Power Trial Data

Mikulec, Marko; Piehl, Henry

doi:10.21278/brod74103

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…For the cases given in Table 7, the numerical setups are the same at the full and model scales. The STAR-CCM+ default discretization schemes [26] are used in case 1, while remaining cases use different discretization schemes, as shown in Table 7.…”

Section: Discretization Schemesmentioning

confidence: 99%

The Impact of Numerical Parameters on the Resistance Characteristics of a Container Ship at the Model and Full Scale

Grlj,

Degiuli,

Martić

2023

JMSE

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Computational Fluid Dynamics (CFD) is a powerful tool used to predict the resistance characteristics of a ship. However, it is important to determine the numerical and modelling errors to assure accurate results. The aim of this study is the investigation of the impact of different numerical parameters on the total resistance, wave pattern and ship motion in numerical simulations at the model and full scale. These include the turbulence model and discretization schemes for convection, gradient and temporal terms within the governing equations. The numerical model used in numerical simulations is based on Reynolds Averaged Navier-Stokes (RANS) equations which are discretized using the Finite Volume Method (FVM). To locate and track the free surface, the Volume of Fluid (VOF) method is employed. The Grid Convergence Index (GCI) method is used for the verification study. The obtained results show that the selection of the discretization scheme for temporal term does not have impact on the median value of the total resistance and that the first-order scheme assures faster convergence in numerical simulations at the full scale. A higher portion of the frictional resistance in the total resistance is obtained with numerical simulations at the model scale in comparison to the full scale.

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Section: Discretization Schemesmentioning

confidence: 99%

The Impact of Numerical Parameters on the Resistance Characteristics of a Container Ship at the Model and Full Scale

Grlj,

Degiuli,

Martić

2023

JMSE

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“…Due to heavy costs and the impossibility of controlling ice conditions, it is very difficult to obtain data for certain situations. Considering these difficulties, Mikulec and Piehl [4] established a full-scale CFD model using the test results and verified the results. Tests performed in ice tanks can also generate good data to evaluate the ice load on floaters [5].…”

Section: Introductionmentioning

confidence: 97%

Untitled

2023

Brodogradnja

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To evaluate the time-domain positioning performance of arctic marine structures, it is necessary to generate an ice load appropriate for the current position and heading of the structure. The position and orientation angle of a floating body continuously change with time. Therefore, an ice load is required for any attitude in the time-domain simulation. In this study, we present a fundamental technique for analyzing ice loads in the frequency domain based on data measured at various angles in the ice-water tank experiment. We perform spectral analysis instead of general FFT to analyze the ice load, which has the characteristics of a random signal. To generate the necessary ice load in the time domain, we must first interpolate the measured data in the frequency domain. Using the Blackman-Tukey method, we estimate the spectrum for the measured data, then process the data to generate the training set required for machine learning. Based on the results, we perform regression analysis by applying four representative techniques, including linear regression, random forest, or neural network, and compare the results with MSE. The deep neural network method performed best, but we provide further discussion for each model.

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“…Liu et al [2] used the finite element analysis software to establish a full-length model and a simplified submarine model; and analyzed the impact of different mass and velocities from the aspects of damage, deformation and impact force of SFT tube. Although using the full-length model can improve the consistency of the analysis results and the actual situation, it may be limited by the experimental site and analysis software, and may cause a waste of resources [18]. Meanwhile, more researchers performed the three-dimensional truncated model in the analysis.…”

Section: Introductionmentioning

confidence: 99%

Dynamic responses analysis of submerged floating tunnel under impact load

Wang,

Qiao,

Zhou

et al. 2024

Brodogradnja

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Submerged floating tunnel (SFT) may be subjected to sudden impact loads such as submarine and shipwreck. Besides the local damage caused by impact, the overall transient dynamic response may also affect its driving safety. Based on the dynamic impact finite element software, the full-length model, and the locally truncated accurate model with solid element of the SFT are established respectively. By applying different spring stiffness constraints on the boundary of the truncated model, its first three modes are consistent with the full-length model, thus their dynamic characteristics are basically the same. The truncated model is further used to simulate the impact of a massive object on the SFT under different impact velocities, impact mass, impact angles and impact positions. The velocity and mass of the impact object have positive influences on the peak contact force, the displacement amplitude of the tube and the length of the damaged area. When the impact angle is perpendicular to the SFT tube, the contact force, displacement amplitude and the damaged area are the largest. The change of the impact position has little effect on the contact force and the damage area, but it will affect the distribution of displacement amplitude.

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Verification and Validation of CFD Simulations With Full-Scale Ship Speed/Power Trial Data

Cited by 9 publications

References 13 publications

The Impact of Numerical Parameters on the Resistance Characteristics of a Container Ship at the Model and Full Scale

The Impact of Numerical Parameters on the Resistance Characteristics of a Container Ship at the Model and Full Scale

Untitled

Dynamic responses analysis of submerged floating tunnel under impact load

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