Full scale CFD seakeeping simulations for case study ship redesigned from V-shaped bulbous bow to X-bow hull form

Niklas, Karol; Pruszko, Hanna

doi:10.1016/j.apor.2019.05.011

Cited by 34 publications

(21 citation statements)

References 25 publications

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“…Comparing the remaining two variants, AxeL and X, we can conclude that differences between the results obtained for them are minimal, which results from certain limitations of the strip method, in which the hull shape is simplified and only represented by a set of frame sections. Only the use of more complex numerical methods, CFD for instance, provides opportunities for analysing the effect of bow shape changes [21]. What is more, the variant AxeL is an aberration of the Enlarged Ship Concept (ESC), as it changes the bow form by changing shapes of its frame sections, without extending the entire hull body to preserve mass parameters.…”

Section: Results For Head Wavementioning

confidence: 99%

“…This design is intended to decrease the added resistance of the hull and to reduce dynamic pressures generated by wave breaking. However, in both the AXE-bow and X-bow designs, the decreased displacement of the bow section leads to the increase of pitching and heaving amplitudes, with the resulting amplitude increase of vertical accelerations [16], [21]. The inverted bow concept was also analysed in [22] for frigate FFG-7.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Seakeeping Performance for a Case Study Vessel by the Strip Theory Method

Niklas

Karczewski

2020

Polish Maritime Research

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The increase of seakeeping performance is of particular importance for car and passenger ferries, service ships in the gas and oil extraction industry and offshore wind power farm industry, as well as for special purpose ships (including military applications). In the water areas of the Baltic Sea, North Sea, and Mediterranean Sea, which are characterised by a short and steep wave, the hull shape has a substantial impact on the operational capacity and propulsion efficiency of the ship, as well as on comfort and safety of navigation. The article analyses selected aspects of seakeeping for four variants of a selected case study vessel, indicating practical limitations of the strip method. The analysed aspects included hull heaving and pitching, added resistance, Motion Thickness Indicator (MSI), and Subjective Magnitude (SM). Experimental tests were also performed in the towing tank. Their comparison with the numerical results has indicated high inaccuracy of the strip method. What is more, the simplified representation of hull shape used in the strip method makes it impossible to analyse the effect of hull shape changes on the predicted seakeeping characteristics. Especially for the case of head wave, neglecting highly non-linear phenomena, such as slamming or head wave breaking, in strip method-based computer simulations will significantly decrease the reliability of the obtained results. When using the strip method, the seakeeping analysis should be complemented with model tests in a towing tank, or by another more complex numerical analysis, such as CFD for instance.

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Section: Results For Head Wavementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of Seakeeping Performance for a Case Study Vessel by the Strip Theory Method

Niklas

Karczewski

2020

Polish Maritime Research

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“…Caramatescu and Mocanu, [17], study on the wave impact stress on the composite hull. Niklas and Pruszko, [18], conducted the CFD seakeeping simulations of the modifications of V-shaped Bulbous Bow to X-Bow hull form. Tavakoli et al, [19], study on the dynamic of the planing hull in regular waves by comparing the experimental measurement and numerical methods.…”

Section: The Literature Review On the Development Of The Monohull Fast Boat Hull Formmentioning

confidence: 99%

Study on resistance and intact stability behavior of patrol boat using axe bow hull form to support surveillance activities in the Indonesia territorial sea

Windyandari¹,

Kurniawan²

2021

J Appl Eng Science

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As a sovereign maritime country, Indonesia has an obligation to protect, maintain, and manage marine and fishery resources. Patrol boats as the primary means of monitoring marine and fishery resources are needed in response to several problems and threats that may occur, such as illegal fishing, destructive fishing, violations of zoning in fisheries conservation areas and others. Apart from having to be adequate on the number of units, the patrol boats must also have suitable technology to support pursuit operations and suppress violations. The main objective of this research is to investigate the total resistance and intact stability behavior of the developed axe bow hull geometry for the patrol boat hull. The preliminary design is started with the determination of the principal dimension of the patrol boat. Then the hull geometry configurations were made with the variation of the depth of bow and the water line spline type. In the case of the depth of bow, the bow with the additional depth of 30%, 40% and 50% of the draft was investigated. Otherwise, the water line spline type was configured as convex spline, concave spline and straight spline. According to the numerical analysis, the axe bow hull with the depth of bow of 30% and the straight spline type was presented the smallest total resistance performance. However, in the case of intact stability performance, all developed axe bow hull presented a similar righting moment lever arm (GZ curve). It is indicated that the total resistance of the axe bow hull is influenced by the depth of bow and water line spline type. Furthermore, those variables have a slight influence on intact stability performance.

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“…In general, research on Savonius turbine development is about modifying the number of blades and Shape of blade which is carried out either in simulation or experiment [10]. Collaboration of the mentioned methods is very effective as results of experimental works can be expanded by numerical approach, and vice versa, which this research stage is taken as benchmarking in computational fluid dynamic [11][12][13][14][15] and finite element method [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The effect of multi-stage modification on the performance of Savonius water turbines under the horizontal axis condition

et al. 2020

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Indonesia has the abundant potential of hydropower but not yet processed optimally, which intensely depends on fossil fuel. Hydropower installed in Indonesia is only 11,272 MW, from the estimated potential approximately 94,476 MW. This data shows that 89% of the hydropower potential in Indonesia has not been processed. One of the present efforts to utilize this resource is addressed to develop the Savonius water turbine. Conventional water Savonius turbines have a comprehensible structure and easy to be applied. However, the turbines produce relatively small power, which requires further assessment to improve its performance. The current study is performed by considering geometric changes on the water Savonius turbine to observe their effect on power characteristics. Considered changes are made on the number of stages, and the angle between stages, specifically a single-stage, two-stage 0°, Two-stage 90°, three-stage 0°, and three Stage 120°. The research was carried out by designing simulation model using ANSYS software with CFX Solver. Water speed is determined to 0.8 m/s, while plates with 110 mm in diameter and 110 mm in height are incorporated as rotor configuration. Based on this study, it can be concluded that the addition of the stage affected improving the performance of the Savonius water turbine, where the multi-stage turbine experienced an increment compared to conventional water turbines. The interesting tendency was found on the two-stage rotors with angle of 0° which produced a smaller Cpmax compared to the conventional water Savonius turbines.

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Full scale CFD seakeeping simulations for case study ship redesigned from V-shaped bulbous bow to X-bow hull form

Cited by 34 publications

References 25 publications

Determination of Seakeeping Performance for a Case Study Vessel by the Strip Theory Method

Determination of Seakeeping Performance for a Case Study Vessel by the Strip Theory Method

Study on resistance and intact stability behavior of patrol boat using axe bow hull form to support surveillance activities in the Indonesia territorial sea

The effect of multi-stage modification on the performance of Savonius water turbines under the horizontal axis condition

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