Calculation Method to Include Water on Deck Effects

Carette, Nicolas; Walree, Frans van

doi:10.1007/978-3-030-00516-0_12

Cited by 2 publications

(2 citation statements)

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“…A recent application of Fredyn for the 5415M hull form in calm water and waves can be found in Carette and Van Walree [5] and Quadvlieg et al [19]. Validation of amongst others roll damping predictions or motions in waves with Fredyn can be found in Boonstra et al [3] and Levadou and Gaillarde [15].…”

Section: Fredynmentioning

confidence: 99%

CFD, potential flow and system-based simulations of fully appended free running 5415M in calm water and waves

Toxopeus

Sadat-Hosseini

Visonneau

et al. 2018

ISP

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The seakeeping ability of ships is one of the aspects that needs to be assessed during the design phase of ships. Traditionally, potential flow calculations and model tests are employed to investigate whether the ship performs according to specified criteria. With the increase of computational power nowadays, advanced computational tools such as Computational Fluid Dynamics (CFD) become within reach of application during the assessment of ship designs. In the present paper, a detailed validation study of several computational methods for ship dynamics is presented. These methods range from low-fidelity system-based methods, to potential flow methods, to high-fidelity CFD tools. The ability of the methods to predict motions in calm water as well as in waves is investigated. In calm water, the roll decay behavior of a fully appended self-propelled free running 5415M model is investigated first. Subsequently, forced roll motions simulated by oscillating the rudders or stabilizer fins are studied. Lastly, the paper discusses comparisons between experiments and simulations in waves with varying levels of complexity, i.e. regular head waves, regular beam waves and bi-chromatic waves. The predictions for all methods are validated with an extensive experimental data set for ship motions and loads on appendages such as rudders, fins and bilge keels. Comparisons between the different methods and with the experiments are made for the relevant motions and the high fidelity CFD results are used to explain some of the complex physics. The course keeping and seakeeping of the model, the reduction rate of the roll motion, the effectiveness of the fin stabilizers as roll reduction device and the interaction of the roll motion with other motions are investigated as well. The paper shows that only high-fidelity CFD is able to accurately predict all the relevant physics during roll decay, forced oscillation and sailing in waves.

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Section: Fredynmentioning

confidence: 99%

CFD, potential flow and system-based simulations of fully appended free running 5415M in calm water and waves

Toxopeus

Sadat-Hosseini

Visonneau

et al. 2018

ISP

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“…WoD is an event where water rises onto the deck and can lead to various disasters, causing RoPax OCD to capsize. Water rising onto the deck is due to the vehicle deck's lower height than the wave crest's height [12]. WoD can add load to the deck and create a free surface moment that increases the ship's KG.…”

Section: Introductionmentioning

confidence: 99%

Survival Stability of RoPax Reviewed In Terms of The Water on Deck (WoD)

Hasanudin,

Yulianto,

Zubaydi

et al. 2023

IJMEIR

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RoPax vessels are widely used worldwide but contribute to numerous fatalities. Accidents result from human factors, vessel damage, management, and natural causes. Vessel stability is a significant concern, with WoD leading to increased load and rising KG, potentially causing capsizing. This study examines a RoPax OCD UFP that experienced a WoDrelated accident in Indonesian waters. Modifications considered are standard freeing ports, becoming RoPax OCD SFP, and applying side casings, or RoPax OCD WS assessed the Stockholm Agreement. Fluid simulation and stability failure criteria were employed at varying wave heights. The largest RAO on the variation of heading angle is changed into stability criteria, resulting in realistic outcomes that have not been seen in earlier research. The highest RAO roll occurs at a heading encounter angle of 60 degrees with a value of 2.192362 degrees/m. Results show survival for RoPax UFP, RoPax SFP, and RoPax WS in the 0-1 m wave height range, with only RoPax UFP capsizing at 2-3 m. RoPax WS has an extended stability arm but decreases stability at high wave heights. RoPax SFP is unaffected by WoD but may still face capsizing depending on the pure stability arm GZ factor. Modifying RoPax UFP to RoPax SFP or RoPax WS can improve survival intact stability.

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Calculation Method to Include Water on Deck Effects

Cited by 2 publications

References 0 publications

CFD, potential flow and system-based simulations of fully appended free running 5415M in calm water and waves

CFD, potential flow and system-based simulations of fully appended free running 5415M in calm water and waves

Survival Stability of RoPax Reviewed In Terms of The Water on Deck (WoD)

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