Numerical investigation on the hydrodynamic performance of high-speed planing hull with transom interceptor

Jangam, Suneela; Krishnankutty, P.; Subramanian, V. Anantha

doi:10.1080/17445302.2020.1738134

Cited by 12 publications

(5 citation statements)

References 13 publications

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“…This is because, in the case of a low Froude number, the hull dynamic lift is small, and thus the wet area of the hull decreases slowly. According to Froude's assumption, the resistance is proportional to the square of the speed, so the resistance tends to increase with the increase of speed at this stage (Suneela et al, 2020). As Fig.…”

Section: Influence Of the Wheel Flip Angle On Hydrodynamic Performancementioning

confidence: 92%

Influence of a walking mechanism on the hydrodynamic performance of a high-speed wheeled amphibious vehicle

Feng

et al. 2023

Mech. Sci.

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Abstract. In order to reduce the resistance and increase speed for a high-speed wheeled amphibious vehicle, a wheel-retracting mechanism was applied to a walking mechanism and the influence was researched. Firstly, to obtain a reliable numerical method, a realizable shear stress transport (SST) k-ω turbulence model and computational fluid dynamic (CFD) model built by an overset mesh technique was used and compared with the corresponding model tests. Secondly, the effect of the wheels' flip angle on resistance, heave and pitch was investigated. Then, the wheel well was optimized by numerical simulation. Finally, the results showed that the influence of the wheels on resistance was more significant, and the larger the wheels' flip angle was, the more significant the resistance reduction would be. An optimized wheel well was beneficial to resistance reduction. Furthermore, the running attitude became steadier, thereby decreasing the heave and pitch.

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Section: Influence Of the Wheel Flip Angle On Hydrodynamic Performancementioning

confidence: 92%

Influence of a walking mechanism on the hydrodynamic performance of a high-speed wheeled amphibious vehicle

Feng

et al. 2023

Mech. Sci.

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“…Seok et al, [3] discovered that the pressure at the bottom of the hull increased in proportion to the interceptor's speed and height for the interceptor's blocking effect. Suneela et al, [8] considered that interceptor height played an essential role in ship performance. The installation location of the interceptor was also an essential factor, as illustrated by the test model by Karimi et al, [10] the ship's resistance was clearly reduced by the interceptor located at the stern and midship, and the maximum resistance reduction for mono hull and catamaran ships were 15% and 12%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Advancing Interceptor Design: Analyzing the Impact of Extended Stern Form on Deep-V Planing Hulls

Samuel Samuel,

Rizal Kurnia Praja,

Deddy Chrismianto

et al. 2024

CFDL

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The deep-v planing hull is designed to operate at high speeds because most of the hull’s weight is supported by the hydrodynamic lift acting on the hull base. Planing hull form characteristics such as deadrise angle, chines, and extended stern significantly affect the ship’s hydrodynamic performance. The addition of the interceptor is an innovation to reduce the total resistance of the ship by controlling the trim angle. However, the form of the ship’s stern is not always the same; thus, it needs to be studied based on the form of the ship’s stern. The extended stern form refers to modifying the hull geometry at the rear, particularly the stern extension beyond its conventional length. This research aimed to analyze the hydrodynamic performance of the interceptor at the extended stern angle. Furthermore, Computational Fluid Dynamics (CFD) simulations were performed to analyze the effect of the extended stern form. A numerical model of the deep-V planing hull with variations of the stern extension was developed, and the flow behavior around the hull was analyzed using CFD techniques. Simulations were conducted under various operating conditions, including different speeds and interceptor strokes. The results indicated that the extended stern's different forms could affect the ship's resistance, trim, and heave. The reduction in resistance was seen at moderate speeds, thereby reducing steep trim angles. The greater the extended stern angle, the more significant the reduction in ship resistance at Fr 0.58 by 26%. Likewise, the combination of interceptor and extended stern experienced a decrease in resistance in the semi-displacement phase with a percentage of 33% resistance, 66% trim, and 47% heave. The interceptor stroke (d) depended on the boundary layer (h). The extended stern with angles of 10°, 20°, and 30° were found to have d/h ratios of 0.38, 0.37, and 0.34. However, it should be noted that extending the stern without interceptors and with interceptors at high speeds could result in a dangerous increase in resistance on high-speed vessel.

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“…Computational methods can be also used to reconstruct the wake waves generated by planing hulls through solving the viscous air-water flow in a numerical tank. There are several computational studies in the literature providing detailed analyses on the wake behind a planing hull (Gray-Stephens et al, 2020;De Luca et al, 2016;Ghadimi et al, 2015;Suneela et al, 2020;and Tagliafierro et al, 2021). Using steady simulation setups, authors have reproduced the water surface elevation pattern in the near wake field of the boat with an acceptable level of accuracy, though they did not highlight the temporal development of water waves.…”

Section: Introductionmentioning

confidence: 99%

Wake waves of a planing boat: An experimental model

et al. 2022

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The wake waves generated by the steady movement of a planing hull are analyzed by means of towing tank tests. Two sets of waves, including divergent and transverse waves, are identified and then analyzed. The wave period of the divergent waves is seen to decrease by the increase in speed of the vessel. These waves are seen to damp temporally. The mechanisms that lead to damping of the divergent wave were found to depend on the wave orbital Reynolds number in semi-planing regime, though that of in-planing regime is a function of the Reynolds number of the boat. The wake angle is seen to decrease with the increase in Froude number, the rate of which becomes relatively large in-planing regime. Transverse waves are captured through measurements, and it is shown that while their period is longer than those of the divergent waves, they are not noticeably damped. Throughout the spectral analysis, it is demonstrated that divergent waves reach a higher level of nonlinearity by the increase in Froude number and, hence, the wave energy is distributed over a boarder range of frequency. The height of the transverse wave is observed to become lower by the increase in speed, but as the towing speed increases, the probability density function curves of surface elevation deviate more and more from the Gaussian distribution.

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Numerical investigation on the hydrodynamic performance of high-speed planing hull with transom interceptor

Cited by 12 publications

References 13 publications

Influence of a walking mechanism on the hydrodynamic performance of a high-speed wheeled amphibious vehicle

Influence of a walking mechanism on the hydrodynamic performance of a high-speed wheeled amphibious vehicle

Advancing Interceptor Design: Analyzing the Impact of Extended Stern Form on Deep-V Planing Hulls

Wake waves of a planing boat: An experimental model

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