Numerical Hydrodynamic Performance of the Stepped Planing Craft and Its Step Height Effect

Nourghassemi, Hadi; Taghva, H. R.; Molyneux, David; Ghassemi, Hassan

doi:10.5829/ije.2019.32.04a.19

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…The average discrepancy between experimental data and numerical analysis drag, dynamic trim, and heave was less than 9%, 4%, 10.5%, as explained in Figure 7; similar validation results between numerical and experimental methods. Studies also occurred in a study carried out by Nourghassemi [22]. He stated that such discrepancy is acceptable and that the presented model can predict the hydrodynamic performance of planing craft.…”

Section: Figure 6 Grid Sizementioning

confidence: 89%

Stern Flap Application on Planing Hulls to Improve Resistance

Budiarto

Samuel

Wijaya

et al. 2022

IJE

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Drag is one of the main factors in improving fuel efficiency. Various study in regards to improve drag performance of a planing hull amongst them is a stern flap. The main parameters to design a stern flap are span length and angle of stern flap. The stern flap works by changing pressure distribution over the ship's bottom and creating a lift force on the stern transom part. This study aims to analyze the behavior of stern flap in variations of span length and angle of stern flap towards drag performance of Fridsma hull form. Finite Volume Method (FVM) and Reynolds-Averaged Navier -Stokes (RANS) are used to predict the hull resistance during simulations. Results show that shear drag is very sensitive towards the total drag value, proving that shear drag valued at least 60% of the total drag in each planing hull multi-phase characteristics phase. Stern flap with 58% of hull breadth span length installed at 0° is considered the most optimal, reducing 10.2% of total drag, followed by 18% displacement reduction. In conclusion, the stern flap effectively improves the Fridsma hull's total drag and its components on 0.89 < Fr < 1.89.

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Section: Figure 6 Grid Sizementioning

confidence: 89%

Stern Flap Application on Planing Hulls to Improve Resistance

Budiarto

Samuel

Wijaya

et al. 2022

IJE

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“…Hydrodynamic analysis with numerical calculations using two transverse step with different heights invented using ANSYS CFD with the k epsilon model. The study found that the ship can reduce drag and pressure distribution and created moderate performance [9].…”

Section: Introductionmentioning

confidence: 94%

Interceptor Impact on the Step Planing Hull: A Computational Investigation

Yulianti,

Riqwan,

Wibisono

et al. 2023

IJERMCE

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Studies have shown that step modifications support the planing hull's ability to accelerate quickly; nevertheless, it also produces excessive drag and creates the hump area extremely trim. Engaging integrated with the interceptor will improve the efficiency of the step hull. Planing hull interceptors are placed at the transom stern to regulate the trim angle and reduce movements caused by seas. This study is focused on the effects of step hulls with interceptors on pressure distribution and how they affect the planing hull's drag, heave, and trim. The environment was modeled according to the two-degree of freedom condition to simulate trim and heave. A combination of an overset mesh and the Finite Volume Method (FVM), the Reynolds-Averaged Navier-Stokes equation, was used to evaluate this study. The water and air phases are represented by the turbulent K- and VOF (Volume of Fluid) models. The errors driven by grid spacing and time-step have been estimated using grid convergence studies. The numerical approach was tested experimentally by Park et al. to ensure accuracy. It has been determined through calculations of the drag, trim, and heave results that adding an interceptor to a step vessel is extremely valuable for minimizing drag and controlling trim

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Experimental investigation on the longitudinal stability of the aerodynamically alleviated marine vehicle with multi-steps

Song,

Du,

Jiang

et al. 2024

Physics of Fluids

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To investigate the hydrodynamic performance and motion characteristics of the ultra-high-speed aerodynamically alleviated marine vehicle (AAMV) with multi-steps, a towing tank test scheme was designed and carried out at the China Special Vehicle Research Institute. The study analyzed the effects of canard angle, flap angle, longitudinal center of gravity, and displacement tonnage on the motion stability of multi-stepped AAMV at different speeds. The results indicate that the canard generates an overturning moment that reduces the resistance but brings forward the speed at which porpoising behavior occurs. Additionally, the backward shift of the longitudinal center of gravity causes motion oscillation during the high-speed planing phase, which negatively affects longitudinal stability. On the other hand, the flaps provide aerodynamic lift and restoring moments, improving the lift-drag ratio and enhancing longitudinal stability. Furthermore, while increased mass may result in higher total resistance, it can actually improve resistance performance per unit mass and improve the lift-drag ratio at cruising speed. The computational fluid dynamics (CFD) method was used to analyze the destabilization mechanism of AAMV under extreme conditions in the test. Numerical results indicate that the longitudinal stability of AAMV is directly affected by the relative positions of the center of gravity and the center of pressure. These results demonstrate the changing rules of resistance performance and longitudinal stability of AAMV under different design parameters, thus providing a powerful tool for optimizing AAMV.

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Numerical Hydrodynamic Performance of the Stepped Planing Craft and Its Step Height Effect

Cited by 3 publications

References 10 publications

Stern Flap Application on Planing Hulls to Improve Resistance

Stern Flap Application on Planing Hulls to Improve Resistance

Interceptor Impact on the Step Planing Hull: A Computational Investigation

Experimental investigation on the longitudinal stability of the aerodynamically alleviated marine vehicle with multi-steps

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