A simplified method to calculate trim and resistance of a two-stepped planing hull

Dashtimanesh, Abbas; Tavakoli, Sasan; Sahoo, Prasanta K.

doi:10.1080/17445302.2016.1262809

Cited by 24 publications

(33 citation statements)

References 8 publications

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“…The majority of developed models for performance prediction have been established by further extension of early empirical-based methods. [1][2][3] This article, however, adopts 2D + T theory, for estimation of running attitudes of planing hulls in calm water. two-stepped planing hulls.…”

Section: Motivationmentioning

confidence: 99%

Development of a 2D+T theory for performance prediction of double-stepped planing hulls in calm water

Bilandi

Dashtimanesh

Tavakoli

2018

Proceedings of the IMechE

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In this article, a mathematical model based on the 2D+T theory has been developed to predict the performance of two-stepped planing hulls in calm water. It has been attempted to develop a mathematical model without using regression formulas. It leads to development of a computational model with no common limitations related to empirical models which have an individual range of applicability. For this purpose, theoretical solution of water entry of a two-dimensional wedge section has been implemented to compute the pressure distribution over wedge section entering water, and then normal forces acting on the two-dimensional sections are computed. Bottom of the boat has been divided into three different planing surfaces including fore, middle and aft bodies. Computations are performed for each of these surfaces. By integrating the two-dimensional sectional normal forces over the entire wetted length of the vessel, the trim angle, wetted surface and resistance have been obtained. To evaluate the accuracy of the presented method, the obtained results are compared against experimental data and a previous empirical-based method developed by authors. The comparison suggests that the proposed method predicted dynamic trim angle, wetted surface and resistance of double stepped boats with reasonable accuracy. The mean errors in prediction of trim angle, wetted surface and resistance are, respectively, 13%, 16% and 8%. It should also be noted that although computation of running attitudes and resistance of double-stepped planing boats are targeted in this article, the mathematical model has been developed in such a way that it has the potential to model transverse and vertical motions of two-stepped planing hulls in future studies.

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Section: Motivationmentioning

confidence: 99%

Development of a 2D+T theory for performance prediction of double-stepped planing hulls in calm water

Bilandi

Dashtimanesh

Tavakoli

2018

Proceedings of the IMechE

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“…Their high-accuracy numerical results show that the overset mesh can improve the efficiency, while ensuring the accuracy of simulation, and the setting of the overset grid is of great referential significance to our work. In 2017, Dashtimanesh et al [11] provided a numerical prediction of the performance of two-stepped planing craft. based on the mathematical model and the obtained results present the good accuracy compared with the test results.…”

Section: Introductionmentioning

confidence: 99%

Seakeeping Analysis of Planing Craft under Large Wave Height

Zhuang

2020

Water

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The purpose of this paper is to conduct a seakeeping analysis of planing craft under regular wave with large wave height. To obtain a reliable numerical method to simulate the sailing of planing craft in waves, Reynolds-averaged Navier–Stokes (RANS) solver and overset method are adopted. The motion response and resistance of the planing craft USV01 in regular wave were numerical predicted and compared with the corresponding seakeeping experimental tests. The results show that the numerical method has high accuracy. For further study, a new planing craft whose name is improved vessel is selected for simulation, the low steaming of the USV01 and improved vessel in regular wave with large wave height was simulated, and the seakeeping of the two vessels was studied. The analysis about the influence of wave length on the motion response and navigation configurations of the improved vessel under regular wave was carried out. Meanwhile, the influence of speed on different navigation configurations of the improved vessel was also analyzed. The improved vessel can provide better seakeeping, and a reduction in the speed of the vessel will benefit its seakeeping, irrespective of its navigation configuration.

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“…Step can create a significant reduction of a dynamic wetted surface and of the dynamic trim angle during high-speed forward motion and thus achieve a reduction of resistance at high speed. There are four options for the hydrodynamic analysis of a stepped hull: the towing tank test [1][2][3], empirical method [4,5], analytical methods [6], and numerical simulation [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…The wake profile is considered horizontal and parallel to the horizon from the separation at the step to where it reattaches on the next surface, contradicting Morabito's wake theory [12], Svahn [11], Dashtimanesh et al [5], and Niazmand Bilandi et al [6] suggested this simplification.…”

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confidence: 99%

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A Validation of Symmetric 2D + T Model Based on Single-Stepped Planing Hull Towing Tank Tests

Bilandi

Mancini

Vitiello

et al. 2018

JMSE

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In the current article, the hydrodynamic forces of single-stepped planing hulls were evaluated by an analytical method and compared against towing tank tests. Using the 2D + T theory, the pressure distribution over the wedge section entering the water and the normal forces acting on the 2D sections have been computed. By integrating the 2D sectional normal forces over the entire wetted length of the vessel, the lift force acting on it has been obtained. Using lift forces as well as the consequence pitch moment, the equilibrium condition for the single-stepped planing hull is found and then resistance, dynamic trim, and the wetted surface are computed. The obtained hydrodynamic results have been compared against the experimental data and it has been observed that the presented mathematical model has reasonable accuracy, in particular, up to Froude number 2.0. Furthermore, this mathematical model can be a useful and fast tool for the stepped hull designers in the early design stage in order to compare the different hull configurations. It should also be noted that the mathematical model has been developed in such a way that it has the potential to model the sweep-back step and transverse the vertical motions of single-stepped planing hulls in future studies.

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A simplified method to calculate trim and resistance of a two-stepped planing hull

Cited by 24 publications

References 8 publications

Development of a 2D+T theory for performance prediction of double-stepped planing hulls in calm water

Development of a 2D+T theory for performance prediction of double-stepped planing hulls in calm water

Seakeeping Analysis of Planing Craft under Large Wave Height

A Validation of Symmetric 2D + T Model Based on Single-Stepped Planing Hull Towing Tank Tests

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