Free Surface Flow Simulation Around an Appended Ship Hull

Özdemir, Yavuz Hakan; Barlas, Barış

doi:10.21278/brod69302

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…It is helpful for reviewing data obtained for comparing data from many studies throughout the planning and development phases of research. As part of the internal development and application of uncertainty analysis processes and the assessment of scale effects and facility bias, conventional uncertainty assessment procedures are used to determine the data quality [28].…”

Section: Description Of Test Conditions and Test Trials -Tests Designmentioning

confidence: 99%

Experimental and CFD Resistance Validation of Naval Combatant DTMB 5415-51 Model

Alaaeldeen Mohamed Elhadad,

Ahmed Mokhtar Abo El-Ela

2023

ARFMTS

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The hull model of the surface combatant DTMB 5415 has been selected as a recommended benchmark naval ship for computational fluid dynamics (CFD) validation for resistance analysis. CFD is used to present a method for predicting surface combatant ship resistance. The resistance calculations of a 3 m DTMB 5415 hull model was compared using experimental and CFD techniques. The bare hull shape experiments were set up and carried out at the towing tank facilities at the Military Technical College's Hydrodynamic Laboratory in Egypt. A benchmark test will ensure that the equipment, procedures, and estimates of uncertainty are adequate. For the purpose of model validation, CFD calculations for a DTMB 5415-51 model are performed using three different mesh sizes for Froude numbers ranging from 0.10 to 0.40. For the same Froude numbers and free model conditions, results from towing tank experiments on the model's resistance, sinkage, and trim are presented. The numerical simulations are quantitatively consistent. The numerical results are compared in terms of wave field and resistance coefficients to determine the accuracy of the solution parameters. As evidenced by the resistance curves, the experimental investigation appears to provide very good agreement, indicating that the CFD model is capable of simulating the steady flow around a ship hull with acceptable accuracy and can thus be used as a supplement to laboratory model tests for ship design and ship hydrodynamic research.

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Section: Description Of Test Conditions and Test Trials -Tests Designmentioning

confidence: 99%

Experimental and CFD Resistance Validation of Naval Combatant DTMB 5415-51 Model

Alaaeldeen Mohamed Elhadad,

Ahmed Mokhtar Abo El-Ela

2023

ARFMTS

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“…[3] The choice of prediction method of resistance and power is affected by several factors such as the available capacity and tools, the level of accuracy, available funds, and the current development stage of the ship design process. [1,2] Nowadays, Computational Fluid Dynamic (CFD) simulations are increasingly used for predictions of resistance of ships, becoming an important standard of ship design practices, as shown in references [4,5,6,7,8,9]. Despite this, it can be emphasized that these simulations are particularly appropriate when the main parameters of the ship, main dimensions, and hull form coefficients have been defined, or have a slight variance, and the main attention is focused on the variation of the local geometry of the hull form.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2022

brod

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Preliminary prediction of resistance and power is a fundamental aspect of the ship design process since they directly influence the developments of the design process, fuel consumption and costs, and environmental impact from the early design stage. Parametric predictions of resistance and power, based mainly on statistical regression models that are also ideal for computer programming, are often performed during initial design stages, providing rapid predictions and optimisations for minimum resistance. The paper aims to present the results of the comparative analysis on some conventional hulls of the predictive accuracy of a computer program developed by the author for parametric predictions of resistance and power of ships. The program (entitled Ship Power V 1.0) is developed in the Visual Basic 6.0 environment based on two well-known regression models Holtrop and Van Oortmerssen. The program can perform detailed predictions of resistance and power, resistance coefficients, propeller thrust, hull efficiency, wake, and trust fractions, with no restriction on the number of velocities. In this study, only the analysis of the accuracy of resistance and power prediction is considered. Results of the comparative analysis of the computational procedures of Ship Power V 1.0 versus experimental data, and against results of another well-known commercial software, performed on three models of the Ridgely-Nevitt trawler series and KCS hull have shown a good level of accuracy and reliability as other well-known commercial software.

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The effect of appendages on ship resistance

Mandru

Pacuraru

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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The availability of the robust commercial computational fluid dynamics (CFD) software and the increasing power of high-performance computers (HPC) boosts the use of CFD techniques for numerical investigations of ship hydrodynamimcs performaces. Nowadays, CFD tools provide a rather accurate solution for complex physical phenomena, such as wave braking, turbulence, flow detachment and overturning. Consequently, the ability to capture this fenomena allows a detailed insight into the flow mechanism that trigger and sustain them. The paper focuses on a numerical investigation of flow around hull a fully appended ONR Tumblehome model 5613. Due to special operation conditions, naval ships are equipted with a large number of appendages such as sonar domes, brackets, twin propeller shafts and twin rudders. Position and alignment of these appendages are essential in order to avoid the increased resistance, decreased propulsive efficiency and cavitation. NUMECA/FineMarine commercial code has been used to evaluate the flow field around ONRT (Office of Naval Research Tumblehome) hull and to estimate the effect of the appendages on ship hydrodynamics performances. Comparison with experimental towing tank results showed good agreement with a difference of up to 2%.

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Free Surface Flow Simulation Around an Appended Ship Hull

Cited by 6 publications

References 23 publications

Experimental and CFD Resistance Validation of Naval Combatant DTMB 5415-51 Model

Experimental and CFD Resistance Validation of Naval Combatant DTMB 5415-51 Model

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The effect of appendages on ship resistance

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