Effects of stern-foil submerged elevation on the lift and drag of a hydrofoil craft

Suastika, I Ketut; Apriansyah,

doi:10.1088/1755-1315/135/1/012003

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…Simultaneously, a prototype of the principle is built, and the wave-making flume experiment is preliminarily built based on potential flow theory. In K. Suastika's paper [18], effects of the stern-foil submerged elevation on the lift and drag of a fin craft were studied by using Computational Fluid Dynamics (CFD) and considering three alternative stern-foil submerged elevations. J.…”

Section: (D)-(e)) In 2008 Kenichimentioning

confidence: 99%

Propulsion Performance Analysis of Wave-powered Boats

Chang

Deng

Zhang

et al. 2020

Int. j. eng. technol. innov.

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With the development of oceanographic research and marine environment protection, mobile marine platforms are applied for ocean observation for a long journey. Wave-powered boats are capable of applying wave motion to propel itself and make a long-duration survey. This paper presents the dynamics of the wave-powered boat under the excitation of the heave motion and pitch motion. Taking the wave-powered boat with double fins as an example, the heave and pitch motions of the boat are obtained by ANSYS-AQWA firstly. Then the relationship between propulsion performance and three factors, including wave height, wave period, and restoring stiffness of torsion spring, was analyzed through multibody dynamics software ADAMS. With the increase of sea state from level 1 to level 4 the average propulsion speed increased from 0.4m/s to 1.4m/s. Under the same wave height and period, with the increase of restoring stiffness of torsion spring from 0.0125N·m/deg to 0.3N·m /deg, the propulsion speed of the wave-powered boat increases first and then decreases, and there exists an optimum stiffness. Through the calculation it is found that when the restoring stiffness of torsional spring is increased from 0.025N·m /deg to 0.2N·m /deg with the sea state level 1 to 4, the wave powered boat has better propulsion performance.

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Section: (D)-(e)) In 2008 Kenichimentioning

confidence: 99%

Propulsion Performance Analysis of Wave-powered Boats

Chang

Deng

Zhang

et al. 2020

Int. j. eng. technol. innov.

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“…Closely related to the present study, Suastika et al, [9] and Riyadi and Suastika [10] reported the applications of a Hull Vane® on a 31 m high-speed crew boat (offshore supply vessel). In both studies, the authors chose NACA 641-212 section [11] for the Hull Vane® based on the largest lift to drag ratio among the sections considered in earlier studies [12,13]. Suastika et al, [9] and Riyadi and Suastika [10] found that the most optimum vane's position was that with the vane leading edge two chord lengths (2c) behind the ship transom, which is close to that reported by Uithof et al, [4].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Performance of Straight- and V-shaped Vanes Applied as Energy Saving Device to High-speed Boats

Ketut Suastika,

Ahmad Septiawan Saputra,

Adnan Faiz Fauzi

et al. 2023

CFDL

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Hull Vane® is a device, generally utilizing a straight vane, installed horizontally near the stern of a vessel below the water surface and oriented in the transverse direction of the vessel with the purpose to save fuel consumption and to increase the vessel’s comfort. Because the bottom-hull form of a ship is generally curved, a non-straight vane may be more effective than a straight one when applied as Hull Vane®. The purpose of this study is to investigate the effectiveness of a V-shaped vane when applied as Hull Vane® on a 31 m high-speed crew boat. The study utilizes a computational fluid dynamics (CFD) method. CFD results show that the Hull Vane® decreased the bow-up trim of the boat, affected the boat’s wetted surface area, and decreased the height of the waves generated by the boat. The wave-height reduction due to the V-shaped Hull Vane® is larger than the straight Hull Vane®. Further, the Hull Vane® significantly reduced the total resistance of the boat at Froude number Fr = 0.34 with a larger reduction resulted from the V-shaped Hull Vane® (25.09% reduction for the straight vane and 30.75% reduction for the V-shaped vane). The observed resistance reduction decreased with increasing speed, ascribed to a too-large vane’s lift. The V-shaped Hull Vane® is more effective than the straight Hull Vane® in reducing the total resistance of the boat.

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“…However, the hydrofoil or known as lifting foil [3] is able to produce sufficient lifting force at relatively high speed. Inherently, the hull can be lifted out of the water as well as the ship's wetted surface area (WSA), where the ship's resistance reduces [4]. In other words, the ship's displacement reduces due to presence of the lift force arisen the boat [5].…”

Section: Introductionmentioning

confidence: 99%

Computational Investigation into Prediction of Lift Force and Resistance of a Hydrofoil Ship

Fitriadhy

Nabila

Grosnin

et al. 2022

CFDL

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The characteristics of the fore and aft foils at the various angles of attack incorporated with forward velocities have been vulnerable to induce strong nonlinearities to dynamic lift force and ship resistance. Then, a computational simulation is necessarily required to predict their performances in the calm water condition. This paper presents a computational investigation of the hydrofoil ship on predicting lift and ship’s resistance using fluid dynamic (CFD) simulation approach. Several parameters such as Froude numbers and the angle of attacks both of fore and aft foils have been accordingly taken into account. The results revealed that the subsequent increase on angle of attack of fore and aft foils was directly proportional to the lift force and the ship’s resistance. In addition, the lift force of the aft and fore foils with the angle of attacks of 10 degrees and 5 degrees, respectively, resulted in the significant increase of the lift force and the ship’s resistance. However, the subsequent increase of Froude number from 1.382 up to 1.626 has insignificant effect to the lift and the ship’s resistance of the hydrofoil. It can be concluded that CFD simulation is very beneficial to ensure an operational effectiveness of hydrofoil design towards prediction on the lift force and the hydrofoil’s resistance at the preliminary design stage.

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Effects of stern-foil submerged elevation on the lift and drag of a hydrofoil craft

Cited by 5 publications

References 2 publications

Propulsion Performance Analysis of Wave-powered Boats

Propulsion Performance Analysis of Wave-powered Boats

Comparison of Performance of Straight- and V-shaped Vanes Applied as Energy Saving Device to High-speed Boats

Computational Investigation into Prediction of Lift Force and Resistance of a Hydrofoil Ship

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