Launching of ships from horizontal berth by tipping tables – CFD simulation of wave generation

Senjanović, Ivo; Katavić, Josip; Vukčević, Vuko; Vladimir, Nikola; Jasak, Hrvoje

doi:10.1016/j.engstruct.2020.110343

Cited by 6 publications

(5 citation statements)

References 18 publications

(28 reference statements)

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“…In the process of building a new ship, ship launching is one of the stages that will be passed before the ship is handed over to the ship owner. Ship launching is primarily influenced by various factors, including the transfer of ship weight from the block keel, waterline, land structure, and others, which is one of the supporting factors during the ship's construction itself [7].…”

Section: Methodsmentioning

confidence: 99%

“…Ship launching can generally be performed in longitudinal and lateral positions. In ISSN : 2085 -1669 Website : jurnal.umj.ac.id/index.php/jurtek e-ISSN : 2460 -0288 longitudinal ship launching, there are fewer launching structural components than in side launching [7]. Ship launching can be determined based on the type of building berth, the design of the ship's hull, and the launching weight of the ship.…”

Section: Introductionmentioning

confidence: 99%

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Design of a Passenger Ship Launch Using an Air Bag System

Abdullah,

Sarena

2024

JurTek: Jurnal Teknologi FT UMJ

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Ship launching is one of the stages of ship production before the ship is handed over to the owner, which marks the beginning of the ship's life. With the development of technology at this time, various launching methods have been developed, one of which is the launching method using an air bag system. Launching using air bags has many advantages compared to conventional launching methods that have been used so far. Pre-launch calculations are performed to avoid risks during the launch. Launching using air bags begins with calculating the weight plan of the ship launch and the preparation of the air bag layout. Using CB/T 3837:1998 Technological Requirements for Ship Upgrading or Launching Relying on Air Bags, Shipbuilding Industry Standard, and ISO 14409:2011 ships and marine technology-ship launching air bags, the number of air bag requirements and layout can be determined to support the ship launching process. The passenger ship, with an length overall of 62.80 metres, is planned to have a launch weight of 1058.881 tons. By using the QG6 high-bearing capacity air bag model with 6 layers of cord fabric with a diametre of one metre and a contact length between the air bag and the ship's body of ten metres, a total of 11 air bags are required in a linear arrangement to support the launch of a passenger ship. The distance between air bags is 2.07 metres to 5.736 metres, the longer the distance between air bags, the greater the load supported by each air bag.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a Passenger Ship Launch Using an Air Bag System

Abdullah,

Sarena

2024

JurTek: Jurnal Teknologi FT UMJ

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“…The URANS approach has been successfully used in previous studies such as large-scale rotorcraft [3,4,15,14,16,17] and small-scale multicopters [18,19,20,21]. The overset mesh method in the flow solver OpenFOAM [22,23,24,25] is explored for the simulation of a quadcopter here. An overset mesh method is efficient in resolving multiple rotors simultaneously with a stationary fuselage [3,4,21,18].…”

Section: Introductionmentioning

confidence: 99%

Numerical study on interactional aerodynamics of a quadcopter in hover with overset mesh in OpenFOAM

Park,

Jee

2023

Physics of Fluids

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Interactional aerodynamics of a quadcopter in hover is numerically investigated in this study. The main objective is to understand major flow structures associated with unsteady airloads on multirotor aircraft. The overset mesh approach is used to resolve flow structures in unsteady simulation using the flow solver OpenFOAM. The current computational study demonstrates that aerodynamic interaction between quadcopter components strongly affects the rotor wake, generating interesting vortical structures. Multiple rotors in close proximity generate Ω-shaped vortical structures merged from rotor-tip vortices. The fuselage of the current quadcopter deflects the wake flow of the four rotors toward the center of the vehicle. Such interactional aerodynamics, i.e., rotor–rotor and rotor–fuselage interaction, varies the inflow condition of a rotor blade during the rotor revolution. Therefore, the quadcopter experiences unsteady airloads per rotor revolution. Our study indicates that a typical quadcopter would experience 8/rev thrust variations, which are a combined outcome from 4/rev thrust variations on the rotor and 2/rev fluctuations on the fuselage. The current understanding of interactional aerodynamics could help to design reliable and efficient multicopter aircraft.

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“…Senjanovic et al [12] used the overlapping-mesh method to simulate the ship motion and surface waves of large oil tankers in lateral launching. It provided a more precise pre-diction of the amplitude and phase of the first wave.…”

Section: Introductionsmentioning

confidence: 99%

Numerical Simulation on Dynamic Characteristics of Longitudinal Launching of Large Container Ships

Liu

Wang

et al. 2022

JMSE

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The upsizing and rapid development of container ships has resulted in many large ships launching in small slipways due to the lagging of advanced equipment. In particular, the dynamic characteristics of these large ships in the longitudinal launching operation under restricted water are yet to be studied in detail. In this study, a ship model to simulate the longitudinal launching process of an 8500 TEU container ship was created based on the URANS method. The ship resistance in calm water was determined and validated against the experimental data. The influence of the stern appendage on the ship’s resistance and the flow field around the hull, with and without the aft poppet, under various water-depth-to-draught ratios was analyzed. A comparison of the ship’s resistance between the numerical and the experimental data shows that the difference is minimal, within 1.5%. The numerical results revealed that the aft poppets change the flow pattern and effectively reduce the pressure drag in the drifting stage. The shallow water causes a restraining effect on the ship. The proposed analytical approach in the numerical analysis, considering the aft poppet and the water depth, could provide a better simulation for a large ship’s longitudinal launching operation.

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Launching of ships from horizontal berth by tipping tables – CFD simulation of wave generation

Cited by 6 publications

References 18 publications

Design of a Passenger Ship Launch Using an Air Bag System

Design of a Passenger Ship Launch Using an Air Bag System

Numerical study on interactional aerodynamics of a quadcopter in hover with overset mesh in OpenFOAM

Numerical Simulation on Dynamic Characteristics of Longitudinal Launching of Large Container Ships

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