Study on the course stability of very large vessels in shallow water using CFD

Lee, Sang‐Min; Hong, Chun-Beom

doi:10.1016/j.oceaneng.2017.09.064

Cited by 20 publications

(15 citation statements)

References 15 publications

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“…Navigational operations have high-risk factors due to the combination of many factors, and negative consequences of these operations can cause major damages. For example; it is not the only danger to strand due to trim and squat, but also the loss of maneuvering characteristics as a result of the fluctuated hydrodynamic forces on the hull that can lead to sea accidents, depending on the size of the ships [17]. However, ship domain is one of the most critical information due to avoid collisions [18].…”

Section: Bridge Operations Risks and Root Causesmentioning

confidence: 99%

Safety Indications of Navigation Audit for Tankers to Develop a Bridge Inspection Method

Altun¹,

Kum²

2019

JCC

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A significant amount of world trade has been carried out by maritime transportation. In 2016, world maritime trade volume increased by 2% and reached 10.3 billion tons, 55,057 global ton-miles. There has been a significant increase in quantity and tonnage of tankers, with the requirement for well qualified and experienced personnel in the maritime industry. Therefore, employment has become a serious problem. Major Oil Companies (MOCs), port states, classification societies, and flag states have increased the number of inspections on tankers due to safety concerns. Tanker inspections are becoming more difficult and inefficient due to intensive cargo operations. Inefficient, subjective or substandard inspections/evaluations are usually leading to incorrect decisions, and causing an unfair market. In addition, corrective actions cannot be carried out properly, and decision making authorities cannot give the best decisions about vessels and their operator companies due to lack of scientific methods. In this study, details are identified such as finding the root causes, identifying the risks, understanding the possible consequences, and determining the working areas during the ship crews', operators', auditors' and charterers' working and ship selection periods. Pairwise comparisons were carried out by means of surveys on ship masters (captains), chief officers, deck officers, and superintendents. Five criteria-Crew, Equipment, Company, Structure, and ISM (International Safety Management) were weighted using Analytical Hierarchy Process (AHP). Finally, Bridge Safety Support System (BSSS) was developed according to criteria weights. In this way, best choices can be offered to ship charterers about which ship is better for a company's interests. And, carrying out bridge inspections and corrective actions will be more reliable and effective for maritime transportation. Statistical data and vessel improvements will be obtained in BSSS. As a result, fair market conditions will be available in maritime industry with the help of this study. How to cite this paper: Altun, M.H.A. and Kum, S. (2019) Safety Indications of Navigation Audit for Tankers to Develop a

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Section: Bridge Operations Risks and Root Causesmentioning

confidence: 99%

Safety Indications of Navigation Audit for Tankers to Develop a Bridge Inspection Method

Altun¹,

Kum²

2019

JCC

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“…However, RANS equations are still not enough to close system of equations governed the flow around a hull so adding additional equations which come from appropriate turbulence model to close the system of equations Two standard k-ε and k-ω models of turbulences were usually applied to predict resistance using CFD but they have proved to be inaccurate in the flow separation region; therefore, the turbulent model named Sheer Stress Transport (SST) k-ω has been widely used in most current works on CFD-based resistance prediction [6]. This turbulent model is a conglomeration of the robust and accurate formulation of the standard k-ω model in the near-wall region with the standard k-ε model in the far-field so they are more accurate and reliable [7]. The mathematical explanations of this turbulent model can be found in relevant specialized references [8].…”

Section: Introductionmentioning

confidence: 99%

“…Petros Voxakis at Massachusetts Institute Technology (MIT) used DTMB-5415 model on resistance computation using standard turbulent model k-ε on RANS simulation and CFD software namely STAR-CCM + [4]. Lee et al [7] used the Series 60 model on resistance calculation by CFD codes.…”

Section: Introductionmentioning

confidence: 99%

Improving the Accuracy of Ship Resistance Prediction Using Computational Fluid Dynamics Tool

Huynh

Tran

2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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The ship resistance prediction using CFD tool has become an accepted method over the last decade; however, the CFDbased ship resistance results are not always accurate. This paper presents the approach of determining the input parameters of the CFD solution for ship resistance prediction, including of size and boundary conditions of the computational domain, and parameters of turbulent model in accordance with the geometric characteristics of hull to improve the accuracy of CFD-based resistance values for a specific ship type. Two same type of fishing vessels named FAO 72 and FAO 75 which are tested in towing tank are chosen as the computed ship to apply this approach for resistance prediction accurately. The CFD-based resistance results of these vessels are compared with corresponding model testing results to analyze accuracy and reliability of this approach as well as discussing the effect of the initial parameters of the CFD solution on the resistance results as mentioned. The research results shown that the accuracy of three dimensions (3D) model of computational ship, the appropriate values of computational domain size and turbulent model parameters for resistance prediction using CFD are the input factor to improve the accuracy of resistance values. Especially the specific values of computational domain size and turbulent model parameters are presented in this paper will be the input parameters to predict the resistance using CFD for the fishing vessels with the same geometric characteristics as the computed ship.

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“…The towing instability in term of large heave and pitch motion may occur when the towing of ship exposed to various sea conditions such as wave and wind. Therefore, it is necessary for the barge to keep at steady state for its safety during towing [1] since it do not equipped with active surface control to keep it stable [2].…”

Section: Introductionmentioning

confidence: 99%

“…CFD is a reliable and practical tool to solve maritime problem such as ship towing, seakeeping and analysing the ship resistance. There are researchers such as those in [8,13,21,22], [1,3,23,24] that have been using the CFD since it can capture the hydrodynamic force and non-linear phenomenon during the simulation [1,9]. This paper proposes an analysis on heave and pitch motion of a towed ship in wave using an asymmetrical bridle towline model by using CFD.…”

Section: Introductionmentioning

confidence: 99%

Heave and Pitch Motions of a Towed Ship in Waves Incorporated with an Asymmetrical Bridle Towline Model

Fitriadhy

Mansor

Aldin

2019

EPI-IJE

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Investigation of a ship towing system performance in waves incorporated with an asymmetrical towline configuration is necessarily to be studied to ensure a towing safety of navigation. To achieve the objective, this paper presents the ship towing motion performance in waves using Computational Fluid Dynamic (CFD) approach. Here, the heave and pitch motions of the towed ship so-called barge has been analysed, where several effects of the towing angle and towing speeds have been taken into account. In the calm water condition, the results revealed that the increase of tow angle was proportional with the sufficient reduction of the sway amplitude motion and inversely proportional to her yaw motion. The increase of the asymmetrical tow angle, however, has led to increase her sway motion amplitude in wave condition and conversely reduced the tow speed increased. In addition to the pitch motion characteristic, it subsequently increased by 12.1% as the tow angle raised from 25° to 35°; meanwhile the pitch motion of barge has by 10.2% as the tow speed increased from 0.655 m/s to 0.728 m/s. This CFD simulation is very useful as the preliminary prediction on the heave and pitch motion characteristics ensure a safety navigation of a towed ship in waves.

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Study on the course stability of very large vessels in shallow water using CFD

Cited by 20 publications

References 15 publications

Safety Indications of Navigation Audit for Tankers to Develop a Bridge Inspection Method

Safety Indications of Navigation Audit for Tankers to Develop a Bridge Inspection Method

Improving the Accuracy of Ship Resistance Prediction Using Computational Fluid Dynamics Tool

Heave and Pitch Motions of a Towed Ship in Waves Incorporated with an Asymmetrical Bridle Towline Model

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