Interceptor design for optimum trim control and minimum resistance of planing boats

Mansoori, M.; Fernandes, Antonio Carlos; Ghassemi, Hassan

doi:10.1016/j.apor.2017.10.006

Cited by 30 publications

(22 citation statements)

References 9 publications

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“…The height of the interceptor is an important factor as pointed out by Ghassemi et al [8], and it has a close relationship with speed. This conclusion is confirmed by Mansoori et al [9][10][11]; however, in Mansoori's investigation, the length of the hull and the thickness of the boundary layer should be taken into account. To get a better design of the interceptor for the trim optimization and minimum resistance of the planning boat, Mansoori et al investigated the major geometric parameters (height and width) of interceptors.…”

Section: Introductionmentioning

confidence: 55%

“…Ghassemi et al [8] conducted a model test on a yacht with the interceptor, finding that high pressure is induced in the region between the interceptor and the bottom, and the wetted surface and resistance is reduced by the interceptor. In 2017, Mansoori et al [9][10][11] investigated the flow field around the interceptor in the conditions of different heights by model tests and CFD and found that a remarkable pressure gradient is induced by the interceptor and the resistance of the hull is therefore reduced. The investigation of Guo et al [12] demonstrated that the wake flow and navigation attitude of the hull is changed by the interceptor, and the wave resistance and the wetted surface, as well as the frictional resistance, is reduced.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Lift Force Induced by the Interceptor and Its Affecting Factors: Experimental Study with Captive Model

Rui

Zhang

Luo

et al. 2022

JMSE

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An interceptor is an appendage widely used for high-speed planing boats to reduce resistance and modify hull attitude by the lift force-induced, but the relationship between the induced lift force and the factors affecting it are still not clear, especially for the vessels other than the planing hull. In this paper, a model test of a series of models is performed to investigate the lift force induced by an interceptor and the influence of the affecting factors systematically. The lift forces induced by the interceptor are tested in the conditions of different velocities, interceptor heights, angles, and drafts in the towing tank. The effects of each factor and the coupled effects are analyzed. It is found by the experimental results that the lift coefficient of the induce lift force in the present investigation is approximately proportional to the square of the non-dimensional velocity and interceptor height, but the effect of the interceptor height is of a limited extent. The influence of angle and draft on the lift force induced by the interceptor cannot be ignored in the present study. The induced lift force is decreased when the angle of the plate is reduced and is enhanced when the draft is increased.

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Section: Introductionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Investigation on the Lift Force Induced by the Interceptor and Its Affecting Factors: Experimental Study with Captive Model

Rui

Zhang

Luo

et al. 2022

JMSE

View full text Add to dashboard Cite

show abstract

“…Alexander H, Day N and Christopher [8], Schlichting H. [9] concluded extension height should be within the boundary layer. Mansoori et al [10] also studied the length of the wedge. Savitsky and Brown [11] investigated wedge types and hydrodynamic effects on a high-speed craft and developed a formula including the angle and length of the wedges.…”

Section: Literature Reviewmentioning

confidence: 99%

Hydrodynamic investigation of wet swimming platform problem for semi-planning motor yachts

TAŞDEMİR¹

2022

Recent Adv Sci Eng

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One of the main optimization problems for the performance and comfort of yachts is the wet swimming platform problem, also known as the rooster-tail phenomena .And this research presents an investigation using Computational Fluid Dynamics (CFD) method for a real case of an 88 ft. semi-planning motor yacht hull form that encountered this phenomena. First of all, the original hull form was analyzed to define the problem at cruising and maximum speeds, 14 knots, and 24 knots respectively. To solve this problem, modifications to the stern form of the hull were made in a two-step iteration. Initially, the size of the current interceptor was increased with a tunnel wedge. Results of the CFD analysis show that this modification eliminated the wet platform problem and increased the top speed of the yacht. Since the applicability of the wedge to mount is complex and costly, a second analysis with only enlarged interceptors was performed. As a result, the wet platform problem is solved, however, the resistance reduction was slightly lower.

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“…35,36 In addition to studying the effect of interceptor height, Mansoori et al. 37 also considered the span length. Furthermore, Karimi et al.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analyses of wedge effects on the rooster tail and porpoising phenomenon of a high-speed planing craft in calm water

Sajedi

Ghadimi

Sheikholeslami

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents experimental and numerical investigation of stability and rooster tail of a mono-hull high-speed planing craft with a constant deadrise angle. Initially, a one-fifth scale model was tested in a towing tank, which showed porpoising phenomenon at 8 m/s (equal to the speed of sailing). Subsequently, two wedges of 5 and 10 mm heights, based on the boundary layer calculations, were mounted on the aft section of the planing hull. These wedges were shown to increase the lift at the aft section. These experiments were carried out at different speeds up to 10 m/s in calm water. The experimental results indicated that the installed wedges reduced the trim, drag, and the elapsed time for reaching the hump peak, and also eliminated the porpoising condition. All these test cases were also numerically simulated using Star CCM+ software. The free surface was modeled using the volume of fluid scheme in three-dimensional space. The examined planing craft had two degrees of freedom, and overset mesh technique was used for space discretization. The obtained numerical results were compared with experimental data and good agreement was displayed in the presented comparisons. Ultimately, the effect of the wedge on the rooster tail behind the planing craft was studied. The results of this investigation showed that by decreasing the trim at a constant speed, the height of the generated wake profile (rooster tail) behind the craft decreases, albeit its length increases.

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Interceptor design for optimum trim control and minimum resistance of planing boats

Cited by 30 publications

References 9 publications

Investigation on the Lift Force Induced by the Interceptor and Its Affecting Factors: Experimental Study with Captive Model

Investigation on the Lift Force Induced by the Interceptor and Its Affecting Factors: Experimental Study with Captive Model

Hydrodynamic investigation of wet swimming platform problem for semi-planning motor yachts

Experimental and numerical analyses of wedge effects on the rooster tail and porpoising phenomenon of a high-speed planing craft in calm water

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