Calm Water Performance of Hard-Chine Vessels in Semi-Planing and Planing Regimes

Ghadimi, Parviz; Tavakoli, Sasan; Dashtimanesh, Abbas

doi:10.1515/pomr-2016-0068

Cited by 22 publications

(7 citation statements)

References 52 publications

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“…However, the uncertainty of these coefficients can be eliminated using a reduction function proposed by Garme. 19 The same approach was also implemented in Ghadimi et al 24 C red (z) = tanh 2:…”

Section: Mathematical Modelmentioning

confidence: 99%

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Numerical evaluation of hydrodynamic characteristics of planing hulls by using a hybrid method

Kahramanoğlu

Pennino

Yilmaz

2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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The hydrodynamic characteristics of the planing hulls in particular at the planing regime are completely different from the conventional hull forms and the determination of these characteristics is more complicated. In the present study, calm water hydrodynamic characteristics of planing hulls are investigated using a hybrid method. The hybrid method combines the dynamic trim and sinkage from the Zarnick approach with the Savitsky method in order to calculate the total resistance of the planing hull. Since the obtained dynamic trim and sinkage values by using the original Zarnick approach are not in good agreement with experimental data, an improvement is applied to the hybrid method using a reduction function proposed by Garme. The numerical results obtained by the hybrid and improved hybrid method are compared with each other and available experimental data. The results indicate that the improved hybrid method gives better results compared to the hybrid method, especially for the dynamic trim and resistance. Although the results have some discrepancies with experimental data in terms of resistance, trim and sinkage, the improved hybrid method becomes appealing particularly for the preliminary design stage of the planing hulls.

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Section: Mathematical Modelmentioning

confidence: 99%

“…Algarin and Tacson, 21,22 presented a mathematical model for symmetric and asymmetric wedge entry problems. Ghadimi et al, 23,24 employed calm water analyses with a mathematical model based on Algarin and Tuscon's method. In their study, the numerical results were validated using several benchmark models with a high order of accuracy.…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of hydrodynamic characteristics of planing hulls by using a hybrid method

Kahramanoğlu

Pennino

Yilmaz

2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…For this purpose, 2D+T theory is used. This theory has been accepted as an appropriate theoretical model for hydrodynamic simulation of planing hulls in calm water [41][42][43], and in waves [44][45][46][47], as well as roll motion [48][49][50][51]. It is considered that the model passes through a transverse plane and the three dimensional problem can be reduced to a water entry of a solid body with wedge section, as shown in Figure 19.…”

Section: Longitudinal Force Distributionmentioning

confidence: 99%

Experimental Study of the Wedge Effects on the Performance of a Hard-chine Planing Craft in Calm Water

2018

Self Cite

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In this paper, effects of a wedge on the performance of planing craft in calm water are experimentally investigated. Experiments are carried out on three different cases distinguished by the wedge type. The model, built of fiberglass, is a prismatic planing hull with deadrise angle of 24 degrees. Towing tests are conducted at different Froude numbers ranging from 0.21 to 2.1. The total trim angle, resistance, rise up at the CG as well as stern and bow, keel wetted length, chine wetted length, stagnation angle, and the length of stagnation line are measured. They are used to study the effect of installing a wedge on the performance as well as the effect of height on the hydrodynamic characteristics. Based on the observations made, it is concluded that, when the wedge is applied to the hull, the risk of model exhibiting instability diminishes, while total trim angle largely decreases, keel wetted length is enlarged, wetted surface becomes thinner, CG rise up is lowered, and the resistance is reduced. Moreover, experimental measurements and theoretical 2D+T theory are combined to bring deeper insight about physics of the flow and pressure distribution when a wedge is installed on the bottom of a planing hull.

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“…They combined the 2.5D method and a pressure shape function modelling technique. Ghadimi et al [23] presented a mathematical model based on 2D+t theory for predicting the pressure distribution of a hard-chine planing craft in planing and semi-planing modes. Ghasemi et al [24] developed a mathematical model based on the Savitsky model to study the performance of stepped planing hulls.…”

Section: Introductionmentioning

confidence: 99%

A Combined Method to Predict Impact Pressure on Planing Craft

Tahmasvand

Zeraatgar

2021

Polish Maritime Research

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Prediction of the pressure distribution on a planing craft in waves deeply affects its structural design and safe operation. In this paper, the possibility of pressure prediction for the planing craft in waves is studied. A combined method is formulated by which craft motions in waves are computed using a 2.5D method, and the impact pressure is anticipated by the equivalent wedge method. Experiments are conducted to record the vertical acceleration and pressure time trends on a model. Comparing the results of the combined method with the experiments indicates that this approach successfully predicts the heave and pitch motions and the time evolution of the acceleration and pressure. The method presents good estimations for the peaks of the acceleration and pressure. Using the combined method, a parametric study on maximum peak acceleration and pressure is also conducted for various forward velocities and wave heights. It has been shown that the combined method is a fast and reliable tool for maximum peak pressure prediction. The method may be employed for structural design and optimization.

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Calm Water Performance of Hard-Chine Vessels in Semi-Planing and Planing Regimes

Abstract: In the current paper, a mathematical model is developed for performance prediction of hard

Cited by 22 publications

References 52 publications

Numerical evaluation of hydrodynamic characteristics of planing hulls by using a hybrid method

Numerical evaluation of hydrodynamic characteristics of planing hulls by using a hybrid method

Experimental Study of the Wedge Effects on the Performance of a Hard-chine Planing Craft in Calm Water

A Combined Method to Predict Impact Pressure on Planing Craft

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