Scale effects and full-scale ship hydrodynamics: A review

Terziev, Momchil; Tezdogan, Tahsin; Incecik, Atilla

doi:10.1016/j.oceaneng.2021.110496

Cited by 42 publications

(17 citation statements)

References 71 publications

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“…The problem limitation in this numerical method is that the surface roughness value of CFD numerical simulation modeling is ignored, which is useful for the effectivity of calculations. Numerical methods are used to analyze the resistance and the components affecting it [28] to estimate the ship's total resistance value before the resistance test is performed. Prediction of ship resistance from numerical simulation (CFD) must be able to support the towing tank test [29].…”

Section: Methodsmentioning

confidence: 99%

Numerical Analysis of Modified Angle of Entrance and Ducktail Addition of the 1,500 Gt Ro-Ro Ferry Hull Validated With Ship Model Resistance Test

Mintarso,

Semin,

Erwandi

et al. 2023

Jurnal Teknologi

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The main problem of ferry ships is maintaining the speed due to ship resistance. There are many efforts to reduce the resistance by modifications of them. This study aims to reduce resistance due to modification of the hull form on the bow Angle of Entrance (AoE) and ducktail addition at the transom stern. The object of the research is a 1,500 GT ro-ro ferry. The AoE minimizes wave resistance and improves flow patterns, while the ducktail reduces the negative effects of the circulation zone on the wetted transom so that waves and wake are reduced. Computational Fluid Dynamics (CFD) was used to analyze these modifications. The final results of the numerical simulation are then verified by the ship model resistance test in the towing tank. Tests were conducted in calm water conditions at a draft of 3.30 meters with a speed variation of 10 - 18 knots. The results show that with the combination of AoE and Ducktail, at ship speeds of 13 to 18 knots, the reduction in resistance from CFD ranges from 13.13% - 16.69% while the experimental results range from 16.00% - 16.54%. While separately the AoE modification is between 8.89% – 12.19% and ducktail is 3.12% -3,62%.

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Section: Methodsmentioning

confidence: 99%

Numerical Analysis of Modified Angle of Entrance and Ducktail Addition of the 1,500 Gt Ro-Ro Ferry Hull Validated With Ship Model Resistance Test

Mintarso,

Semin,

Erwandi

et al. 2023

Jurnal Teknologi

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“…These models may have non-negligible deviations from full-scale prototypes. Three categories can be made from this difference [14], namly Types of model effects, Measurement effects, and Scale effects are caused by the difference between the forces acting on the full-scale structure and the model [15].…”

Section: Resistance and Ehp Predictionmentioning

confidence: 99%

Ehp Value of Mini LNG Ship With Form Factor From Prohaska and Irls Method Using Ship Resistance Testing Data

Widodo,

Santoso,

Erwandi

et al. 2023

Jurnal Teknologi

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The ship model test was believed to be one of the effective methods for figuring out the boundaries and reliability of the ship's horsepower. The ship's form factor determines a full-scale ship's effective horsepower. Determination of the form factor value can be done experimentally through the Prohaska method. The new method proposed in this study is employed the regression Iteratively Reweighted Least Squares (IRLS) method by utilizing the principle dimension of the ship, such as LWL, B, CB, CP, CM, WSA, T, ∆. etc. The Indonesian Hydrodynamics Laboratory has a database of ships with various principle dimensions which have undergone the towing model test. Through the database, the form factor can be predicted with the IRLS method. The method is then verified and validated with the Prohaska method. The result shows a good agreement with the Prohaska method. The obtained results from the IRLS method also show that the EHP & Resistance calculations are identical with old fashion Prohaska methods. The residual bias factor established by the IRLS method was verified in comparison to the value of the form factor generated by the Prohaska method. Comparison between the two methods results in a small error.

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“…Therefore, the resistance breakdown is an assumption made for the scaling practice rather than an exact physical representation. A detailed outline of the scaling effects and evidence supporting the existence of an interaction term is given by Terziev [18]. Nevertheless, the overall error caused by the resistance coefficient breakdown assumption ( 16) is sufficiently small.…”

Section: The Resistance Breakdownmentioning

confidence: 99%

Vessel Energy Requirement Prediction from Acceleration Stage Towing Tests on Scale Models

Wrzask

2023

Polish Maritime Research

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One of the most crucial tasks for naval architects is computing the energy required to meet the ship’s operational needs. When predicting a ship’s energy requirements, a series of hull resistance tests on a scale model vessel is carried out in constant speed stages, while the acceleration stage measurements are ignored. Another important factor in seakeeping analysis is the ship’s hydrodynamic added mass. The second law of dynamics states that all this valuable information, that is, the dependence of the hull resistance on the vessel’s speed and the added mass, is accessible from just one acceleration stage towing test done up to the maximum speed. Therefore, the acceleration stage, often overlooked in traditional towing experiments, can be a valuable source of information. For this reason, this work aims to generalise Froude’s scaling procedure to full-scale vessels for the accelerated stage towing tests.

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Scale effects and full-scale ship hydrodynamics: A review

Cited by 42 publications

References 71 publications

Numerical Analysis of Modified Angle of Entrance and Ducktail Addition of the 1,500 Gt Ro-Ro Ferry Hull Validated With Ship Model Resistance Test

Numerical Analysis of Modified Angle of Entrance and Ducktail Addition of the 1,500 Gt Ro-Ro Ferry Hull Validated With Ship Model Resistance Test

Ehp Value of Mini LNG Ship With Form Factor From Prohaska and Irls Method Using Ship Resistance Testing Data

Vessel Energy Requirement Prediction from Acceleration Stage Towing Tests on Scale Models

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