An analytical procedure for time domain simulation of roll motion of the warped planing hulls

Ghadimi, Parviz; Tavakoli, Sasan; Dashtimanesh, Abbas

doi:10.1177/1475090215613536

Cited by 19 publications

(16 citation statements)

References 18 publications

(30 reference statements)

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“…Morabito [8] used slender body theory and estimated side forces acting on planing hulls and compared the results with the experimental data. Ghadimi et al [9] also analyzed the roll motion in time domain and estimated its amplitude at different frequencies, based on 2D + T theory. Recently, Kahramanoglu et al [10] computed the damping coefficients of the roll motion for a high-speed craft using Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Stepped Planing Hulls in Finding an Optimized Step Location and Analysis of Its Porpoising Phenomenon

Sajedi

Ghadimi

2020

Mathematical Problems in Engineering

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Stability of a high-speed craft is an essential matter, and porpoising is one of the most critical instabilities that could occur in some planing hulls due to inappropriate design. In this paper, the porpoising phenomenon and variation of step location yielding resistance reduction are studied through experimental and numerical methods. The investigated models include a single-step model and a nonstep model with the same general shape, but with different step location. The nonstep model is previously tested, but the single-step model is examined in the present study. The nonstep model experiences porpoising at 8 m/s speed, but the single-step model remains stable at the same speed. A three-dimensional CFD analysis is conducted using the finite volume method (FVM). On the contrary, the volume of fluid (VOF) scheme is used for free surface modeling, and the overset mesh technique is implemented within StarCCM+ software. The CFD results of total hydrodynamic resistance and dynamic trim angle are compared against the experimental data. The numerical results are in good agreement with the experimental data. Subsequently, ten different stepped models are simulated to examine their effects. The longitudinal distance between steps and aft of these models are in the range of 19 to 50 percent of the length of models. The obtained results show that as steps are located farther than aft, the models become more stable, and resistance increases due to trim reduction. Finally, the optimum location of the step is extracted with the aim of minimizing the resistance through the design of experiment (DOE) method. Based on the DOE method, it is observed that the sensitivity of the drag value to the step location is higher than the speed.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Stepped Planing Hulls in Finding an Optimized Step Location and Analysis of Its Porpoising Phenomenon

Sajedi

Ghadimi

2020

Mathematical Problems in Engineering

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“…Systematic experimental studies of the stepped planing hull series have been conducted by Morabito et al, 3 Lee et al, 4 Ma et al 11 and Taunton et al 12 Besides the mentioned experimental studies, mathematical models have also been used to model nonstepped/stepped planing hulls. 13,14 Some of these mathematical methods have been established by using the 2D + T method, where the results of water entry of a wedge [15][16][17] are used to simulate motion of planing hulls in both calm water and waves (see, for example, Tavakoli et al, 14 Tavakoli and Dashtimanesh 15 and Ghadimi and colleagues [18][19][20][21] ). The 2D + T method has even shown the ability to model yawed planing motion 15,22,23 and has been recently used to model stepped boats by Niazmand Bilandi et al 24 In addition to this model, the theoretical simulations of Matveev 25 have been used for modeling of the flow around stepped planing ships.…”

Section: Introductionmentioning

confidence: 99%

Effects of step configuration on hydrodynamic performance of one- and doubled-stepped planing flat plates: A numerical simulation

Dashtimanesh

Roshan

Tavakoli

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part M:

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Categorized as one of high-speed marine vehicles, stepped planing hulls have the potential to reach relatively high speed in the sea by decreasing wetted surface. There were and still are some challenges in modeling of these vessels and design of ideal situation of steps. In the current study, a numerical-based method has been used to provide understanding about the effect of step height and its location on hydrodynamic characteristics of double-stepped planing plates. At the first step, one-stepped planing plate is numerically simulated. Results are compared against exiting numerical data, suggesting that results of the current numerical simulation are similar to results of previous numerical simulations. Then, double-stepped planing plates are modeled and pressure distribution, wetted length, free surface elevation and drag over lift ratio are computed. It is seen that, ventilation length behind the step and pressure coefficient are increased when step height of one- and a double-stepped planing plates are increased. It has been shown that, unlike an one-stepped planing plate, drag coefficient of a double-stepped planing plate can be increased when the step height is increased. The effects of the location of the second step on the performance of the planing plate have been explored, showing that this position plays a critical role on hydrodynamic forces. It is demonstrated that when the smallest possible lift force is produced by the middle-body, the plate shows the best performance (highest lift over drag ratio).

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“…They obtained hydrodynamic coefficients of the boat in roll motion using forced roll motion. Subsequently, Ghadimi et al 30 offered a time-domain simulation of the roll response of a planing hull where they used previous assumptions by Taxopeus 31 in order to compute the roll added mass. They also utilized pressure distribution in order to determine the roll moment.…”

Section: Introductionmentioning

confidence: 99%

A hybrid empirical–analytical model for predicting the roll motion of prismatic planing hulls

Tavakoli

Ghadimi

Sahoo

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part M:

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During the last 5 years, there have been some major advances in roll motion modeling of planing boats. In this article, previous studies have been reviewed, and an attempt has been made to propose a relatively straightforward method for computing roll motion coefficients and thus predicting the roll response of a planing vessel in calm water on a straight path with constant speed. The proposed method has been developed by modifying, combining, and using previous empirical and analytical methods. Roll restoring moment is determined by implementing an asymmetric parameter in previous relations of lift of planing hulls. Also, an empirical method is proposed for computing righting arm of this moment. Roll damping is computed using previous relations related to damping of lift force and considering the asymmetrical effects. Roll added mass is obtained by utilizing an analytical approach for the roll of a flat plate. However, an effective half-wetted beam computed by asymmetrical effects has been proposed for this purpose. Finally, it has been suggested that current hypothesis be used for time-domain simulation. Validity of the proposed method is evaluated by comparing the obtained righting moment, response amplitude operator, and roll hydrodynamic coefficients against previously published experimental data. This comparison confirms that the proposed method has relatively good accuracy against experimental results. Using the current method, the influence of Froude beam number on roll hydrodynamic coefficients and roll responses has been investigated. It is observed that increase in Froude beam number results in a decrease in roll added mass and an increase in the roll damping. It has also been concluded that for larger load coefficients, the roll hydrodynamic coefficients are larger. Results associated with roll response indicate that an increase in Froude beam number would yield an increase in the amplitude of the response. However, an increase in load coefficient results in a decrease in the response.

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An analytical procedure for time domain simulation of roll motion of the warped planing hulls

Cited by 19 publications

References 18 publications

Experimental and Numerical Investigation of Stepped Planing Hulls in Finding an Optimized Step Location and Analysis of Its Porpoising Phenomenon

Experimental and Numerical Investigation of Stepped Planing Hulls in Finding an Optimized Step Location and Analysis of Its Porpoising Phenomenon

Effects of step configuration on hydrodynamic performance of one- and doubled-stepped planing flat plates: A numerical simulation

A hybrid empirical–analytical model for predicting the roll motion of prismatic planing hulls

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