Numerical investigation of the tunnel aperture on drag reduction in a high-speed tunneled planing hull

Moghadam, Hamid Kazemi; Shafaghat, Rouzbeh; Yousefi, Reza

doi:10.1007/s40430-015-0431-4

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…H.K. Moghadam et al (2015) numerically simulated the forward motion for a series of tunneled planing hulls with different tunnel aperture using FLUENT. Their results showed that the small tunnel aperture could achieve more resistance reduction at high Froude numbers.…”

Section: Introductionmentioning

confidence: 99%

Design of hydrofoil for the resistance improvement of planing boat based on CFD technology

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Design of hydrofoil for the resistance improvement of planing boat based on CFD technology

et al. 2022

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“…Moghadam et al discussed and compared the pe mance between a tunnel hull and its parent monohull based on the k-ε model. The r showed that introducing a tunnel can encourage decreased resistance [12]. Similarly et al carried out a numerical investigation on a stepped monohull and planing trima which shared the same main hull configuration.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Motion Behavior and Longitudinal Stability Assessment of a Trimaran Planing Hull Model in Calm Water

Zeng

Sun

et al. 2021

JMSE

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In this study, a high-speed planing trimaran hull form is designed, and the effects of different displacements and gravity longitudinal layouts on the performance of the trimaran planing hull in calm water are experimentally investigated in the towing tank of the China Special Vehicle Research Institute. Based on previous work, an innovative inner tunnel appendage hydroflap is mounted in the inner aft tunnel, located 1/8 L from the transom in the longitudinal direction with attack angles of 0° and 4°, respectively. Furthermore, a regular stern flap is mounted on the transom close to the chine. The towing test results show that, as the gravity center moves forward, the high-speed region resistance of the planing trimaran increases and the longitudinal stability is also strengthened. Further, the total resistance of the planing trimaran with a heavier displacement is larger while the average mass resistance declines; i.e., the resistance efficiency is improved. The results also indicate that the inner tunnel hydroflap and stern flap enhance the aft hull hydrodynamic lift and tunnel aerodynamic lift. As a result, mounting aft hull lift enhancement appendages can affect the bottom and inner tunnel pressure distribution and then cause a slight resistance decrease in the low-speed region. The value relationship of resistance between groups of appendages for the attached hull and bare hull is reversed at a speed of about Froude number 3.0. Although the aft hull lift enhancement appendages result in a higher resistance cost in the high-speed region, the longitudinal stability is effectively promoted and the occurrence speed of porpoising results in a delay of 1 to 2 m/s.

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“…Yousefi et al introduced two tunnels at the bottom section of a planing monohull to create a trimaran hull form, the Fluent software was used to compare the resistance performance of the modified planing trimaran and original monohull, and a resistance reduction of~14% was reported for the tunneled model at 60 kn [7]. Moghadam et al numerically simulated several planing trimaran models with different tunnel aperture, the calculated results showed that the small tunnel aperture could acquire lower resistance at high speed [8]. Ghassabzadeh and Ghassemi developed an innovative method for the parametric design of a planing tunnel vessel, and numerical and experimental research on its resistance performance was also performed [9,10].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations on the Resistance and Longitudinal Motion Stability of a High-Speed Planing Trimaran

Sun

Zeng

Sun

et al. 2020

JMSE

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The planing trimaran is a novel kind of aerodynamic alleviated marine vehicle and possesses a unique hybrid hydrodynamic and aerodynamic characteristics. In this paper, to investigate the hull behavior of a planing trimaran under the effect of tunnel forces, the tunnel and demihull are treated as appendages mounted on the slender main hull. Numerical simulations were carried out for planing trimaran and a monohull which was built according to the main hull configuration. Mesh convergence studies were implemented based on the public experimental data of a similar planing trimaran. Calculated results show that the presence of tunnel and demihull could decrease the resistance of the main hull and improve the longitudinal motion stability at high speeds. Flow evolutions of waves, velocity vector, wetted length and lift distribution were performed to explain the variation of the tunnel lift and its moment and their influence on hull behavior. Parameter studies on demihull length were carried out as well. It was found that, as the demihull length is increased, the tunnel trimming moment would decrease especially in the final stage of ventilation, making resistance reduced but the motion stability weakened.

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Numerical investigation of the tunnel aperture on drag reduction in a high-speed tunneled planing hull

Cited by 10 publications

References 6 publications

Design of hydrofoil for the resistance improvement of planing boat based on CFD technology

Design of hydrofoil for the resistance improvement of planing boat based on CFD technology

Experimental Study on Motion Behavior and Longitudinal Stability Assessment of a Trimaran Planing Hull Model in Calm Water

Numerical Investigations on the Resistance and Longitudinal Motion Stability of a High-Speed Planing Trimaran

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