Stern Flap Application on Planing Hulls to Improve Resistance

Budiarto, Untung; Samuel, Sonia; Wijaya, Asyhab Arno; Yulianti, Serliana; Kiryanto, K.; Iqbal, M.

doi:10.5829/ije.2022.35.12c.06

Cited by 6 publications

(7 citation statements)

References 16 publications

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“…This trim control can be an interceptor, stern flap, or stern foil 102) . Many studies agree that trim control can reduce unwanted trim angles at high speeds, including the interceptor 79), [103][104][105] , stern flap [106][107][108] , and stern foil 109,110) . Fig.…”

Section: Trim-control Definition and Functionmentioning

confidence: 99%

See 1 more Smart Citation

Using trim Control to Improve energy Efficiency on High-Speed Marine Vehicles (HSMV): A Review

Muhammad Luqman Hakim,

Purnamasari,

Muryadin

et al. 2023

Evergreen

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Indonesia is an archipelago made up of a large number of islands, many of which are small and isolated. For effective connection of the islands, it is crucial to have efficient and welldesigned marine transportation systems. High-speed marine vehicles (HSMVs) are suitable for this purpose due to their compact size and speed. As the country continues to grow, the demand for HSMVs is increasing. However, to address the issue of climate change, these vehicles must have technological advancements that increase their energy efficiency. One way to achieve this is through trim control, a technique that can reduce the ship's resistance and improve energy efficiency. Studies have shown that if the trim control is properly configured, it can reduce the effects of ship drag and porpoising. However, the speed parameter, hull characteristics, and return moment capacity of the trim control must be properly configured. Because if the design is incorrect, resistance actually rises in comparison to not employing trim control.

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Section: Trim-control Definition and Functionmentioning

confidence: 99%

“…Budiarto et al 106) performed a CFD simulation to analyze the application of the stern flap to the Fridsma's hull, with a variation of Fr 0.89-1.78. The analysis findings indicate a positive impact of the stern flap on reducing ship resistance, including pressure drag and friction drag.…”

Section: Trim Tabmentioning

confidence: 99%

Using trim Control to Improve energy Efficiency on High-Speed Marine Vehicles (HSMV): A Review

Muhammad Luqman Hakim,

Purnamasari,

Muryadin

et al. 2023

Evergreen

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“…The result shows that the global effect due to motions and local effects referenced to the stern flap and the waterjets are the leading causes of drag increase, with the non-linear coupling term of local effects contributing the most to drag reduction. Li et al [16] and Budiarto et al [17] studied the effect of stern flaps on a ship in regular waves and high-speed conditions, respectively, and Tripath and Vijayakumar's found that flaps affect trim, sinkage, and propulsion, while the wave suppression improves performance [18].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Speed Loss Reduction and Propulsion Efficiency Improvement of ONR Tumblehome with Active-Controlled Stern Flaps in Resonance Waves

Zhang,

Du,

et al. 2024

JMSE

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The stern flap is a practical hull appendage equipment that enhances ship navigation performance and saves energy. The existing studies mainly focus on the fixed stern flap, other than an actively controlled one, so it is worth further exploring its effect and mechanism. By implanting the PID controller to the stern flap, this paper proposed a free-running CFD model on the ONRT (the Office of Naval Research Tumblehome) ship coupled with the active-controlled stern flap to investigate the hydrodynamic performance in resonance waves. The free-running performance in calm water and regular waves is numerically researched and verified versus the experimental and referenced results. Then, the effect of different PID coefficients and control strategies of the stern flap on the traveling speed, attitudes, and propulsion performance under the resonance wave condition is conducted, and the influence mechanism is explored. The results show that adopting a fixed flap controller and PID controller can reduce the original speed loss by 4.2% and 6.9%, respectively, and increase the average propulsive efficiency of the propeller by 1.0% and 1.4%, respectively. Further analysis reveals that the global effect of the suppressed motion attitudes due to the installation of the fixed flap effectively contributes to the resistance reduction. However, the local effect of the stern flap increases the resistance due to interaction with the propeller and stern. The PID-controlled stern flap exhibits similar average attitudes compared to the fixed one, which means the resistance reduction of the global effect is kept the same, and the active stern flap further improves the stern flow field, where the resistance increment of the local effect is weakened, enhancing the traveling speed and improving the propulsion efficiency.

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“…Deng et al [17] numerically examined interceptor impact on the viscous flow field of deep-V vessels, focusing on alterations in resistance, lift, and distributions of base pressure and stern velocity. Budiarto et al [18] numerically probed the effects of the SF on the resistance components of planing vessels and determined that ship and component resistance can be achieved by adjusting the pitch and heavy value of the ship to decrease its displacement.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Influence of Interceptor and Stern Flap on Ship Resistance and Motion Response in Regular Waves

Song,

Gong,

et al. 2024

JMSE

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Stern flaps and interceptors are prevalent stern appendages on medium- to high-speed ships, designed to modify the sailing posture of ships and diminish resistance. Using the Reynolds-averaged Navier–Stokes (RANS) method combined with overset mesh technology, this study evaluates the performance of a ship in regular waves before and after interceptor and stern flap installation. The findings indicate that the interceptor and stern flap resistance reduction rates initially declined and then rose with wavelength, typically 1–3% higher than in calm water. For a constant wavelength of 1.5 LPP and when wave steepness ak ≥ 0.05, the interceptor and stern flap resistance reduction rates in regular waves decline as wave steepness increases. The stern appendages have a more prominent impact on ship posture owing to heightened ship motion amplitude in wave conditions compared to calm water. Moreover, after fitting the interceptor and stern flap, the heave and pitch transfer functions of the ship lessen after fitting the interceptor and stern flap, particularly when λ/LPP = 1–2; average reduction rates for TF3 and TF5 are 7.2% and 3.9%, respectively, with a stern flap, and 4.4% and 2.1% after fitting the interceptor. This study offers invaluable insights and practical guidance for designing and applying stern appendages.

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Stern Flap Application on Planing Hulls to Improve Resistance

Cited by 6 publications

References 16 publications

Using trim Control to Improve energy Efficiency on High-Speed Marine Vehicles (HSMV): A Review

Using trim Control to Improve energy Efficiency on High-Speed Marine Vehicles (HSMV): A Review

Mechanism of Speed Loss Reduction and Propulsion Efficiency Improvement of ONR Tumblehome with Active-Controlled Stern Flaps in Resonance Waves

Numerical Study on the Influence of Interceptor and Stern Flap on Ship Resistance and Motion Response in Regular Waves

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