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Journal ArticleDOI

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

TL;DR: In this paper, numerical investigations on hydrodynamic quality of high-speed planing hull with spray rails and interceptor are presented, where spray rails are blades which extend vertically downwards at the bot.
Abstract: The study presents numerical investigations on hydrodynamic quality of high-speed planing hull with spray rails and interceptor. Interceptors are blades which extend vertically downwards at the bot...
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Journal ArticleDOI
01 Nov 2021
TL;DR: In this article, the effectiveness of the integrated interceptor-flap system on the hydrodynamic performance of the vessel is influenced by the angular orientation of flap to the interceptor.
Abstract: Different innovative ideas on simple stern fixtures such as stern wedges, flaps, interceptors have evolved over the past few years to improve the hydrodynamic performance of high-speed vessels, including planing crafts. This paper examines the hydrodynamic performance of a planing craft fitted with an interceptor alone and also an interceptor-flap combination at its stern, and the results are compared with the case where the craft uses the interceptor alone. An interceptor-flap combination is the one where an interceptor extends vertically downward at the transom with a flap attached to its end. Different angular orientations of the flap attached to interceptor bottom end and project towards aft are considered in the present study. The effectiveness of the integrated interceptor-flap system on the hydrodynamic performance of the vessel is influenced by the angular orientation of flap to the interceptor. Experiments were carried out on a planing hull with and without interceptor in the towing tank, Department of Ocean Engineering, Indian Institute of Technology Madras. Computational fluid dynamics (CFD) simulations are performed for the planing hull fitted with an integrated interceptor and flap. The investigations look into the aspects of vessel resistance, trim and bottom pressure distribution while it operates in calm water condition and at different speeds. The results show that trim and resistance of the vessel reduce with the use of integrated interceptor-flap at the stern with the flap angle at about 4° to the horizontal and they are less compared with a case where the only interceptor is used.

5 citations

Journal ArticleDOI
03 Jun 2021
TL;DR: A high-performance, low-cost, and easy-to-operate mock-up of an amphibious vehicle designed to overcome the challenges faced in implementing and maintaining a non-streamlined design.
Abstract: Speed on water is a key indicator of amphibious vehicles. However, due to the inherent non-streamlined configuration, when reaching a certain velocity, the resistance acting on the vehicle hull is ...

5 citations


Cites background from "Numerical investigation on the hydr..."

  • ...Suneela et al.(18) analyzed the hydrodynamic performance of high-speed planing hull with interceptor at different heights using dynamic mesh....

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  • ...Suneela et al.18 analyzed the hydrodynamic performance of high-speed planing hull with interceptor at different heights using dynamic mesh....

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Journal ArticleDOI
TL;DR: In this paper , the authors analyzed the wake waves generated by the steady movement of a planing hull by means of towing tank tests and identified two sets of waves, including divergent and transverse waves, were identified and then analyzed.
Abstract: 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.

3 citations

Journal ArticleDOI
TL;DR: Simulation and experimental results verify that the installation position of appendages is reasonable and effective for improving the trimaran stability performance.

3 citations

Journal ArticleDOI
Rui Deng, Zezhen Zhang, F. Luo, Peng Sun, Tiecheng Wu 
TL;DR: 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, including angle and draft.
Abstract: 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.

2 citations

References
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Journal ArticleDOI
TL;DR: In this article, the problem of surface ships free to pitch and heave in regular head waves is analyzed numerically with an unsteady Reynolds averaged Navier Stokes (URANS) approach.

265 citations

Journal ArticleDOI
TL;DR: In this paper, an assessment of the accuracy and effectiveness of different simulation setups and techniques for planing craft is performed, and the results of the V&V study are reported for three different hull models at four Froude numbers.
Abstract: In the context of marine application of computational fluid dynamic (CFD), it is well known that the numerical simulations of planing craft are significantly less reliable than that of displacement ships. For this reason, it is important to perform a comprehensive approach to the verification and validation (V&V) methodology and procedures for simulating CFD planing craft. In the first part of this paper, an assessment of the accuracy and effectiveness of different simulation setups and techniques for planing craft is performed. In the second part, the results of the V&V study are reported for three different hull models at four Froude numbers (Fr). The Unsteady Reynolds-Averaged Navier-Stokes code results were validated using benchmark experimental data obtained for three hull models characterized by systematic variation of the length to beam ratio. Grid independence, iteration, and time-step convergence analysis for response variables (resistance coefficients, wetted surfaces, and dynamic trim angles) were conducted using the main error and uncertainty estimation methods available in the literature. The same procedures were followed for the profiles of the wave patterns. The results showed that there was improved reliability of the numerical simulation of the planing craft in terms of the errors and uncertainties, related to the predictions of resistance, running attitude, and wave pattern. The results of the V&V study highlighted the fact that modeling of the planing craft is a critical point to improve the reliability of the numerical simulation.

65 citations

Journal ArticleDOI
TL;DR: In this article, the impact of interceptors on the performance of an Open 60 yacht hull was investigated, with a marked reduction in calm-water resistance over a wide speed range, with benefits of 10-18% in the speed range between 8 and 20 knots, accompanied by reduced sinkage and trim.

35 citations

Journal ArticleDOI
TL;DR: In this article, a finite-volume method adapted to a structured or unstructured mesh is used to solve the Navier-Stokes equations and the free surface is simulated by the "volume-of-fluid" interface capturing method.
Abstract: We present the results of simulations obtained with a free-surface flow solver based on the following method. The free surface is simulated by the “volume-of-fluid” interface capturing method. This code solves the Navier–Stokes equations using a finite-volume method adapted to a structured or unstructured mesh. The system is constructed using a fully coupled approach. This global approach allows the simulation of complex flow as a breaking or merging wave. Moreover, with the use of a 2D+T decomposition, it is possible to simulate three-dimensional steady flow.

34 citations

Journal ArticleDOI
TL;DR: In this article, the effects of hydrodynamic interceptors on porpoising control are investigated using computational fluid dynamics, the pressure distribution created by interceptor and its effects on poroising are computed and then discussed.

31 citations