Hydrodynamic assessment of planing hulls using overset grids

Sukas, Ömer Faruk; Kınacı, Ömer Kemal; Çakıcı, Ferdi; Gökçe, Metin Kemal

doi:10.1016/j.apor.2017.03.015

Cited by 57 publications

(30 citation statements)

References 12 publications

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“…The hydrostatic resting position of the hull can be calculated quickly and accelerating it from rest provides a natural and more realistic evolution of the vessel's sinkage and trim. This approach proved to have a much faster turnaround for this study than the traditional 2-DOF method [10,16]. The STAR-CCM+ segregated flow solver employing the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm with second-order convection terms was utilized in this study.…”

Section: Computational Approachmentioning

confidence: 99%

“…A variety of potential-flow modeling methods that can account for specific hull geometries have been developed in the past [5][6][7], but they ignore viscous effects and are often applicable only at sufficiently high Froude numbers. With the growth of available computational power, numerical methods accounting for viscosity and flow non-linearities are becoming widely used for ship hydrodynamics studies, including fast boats [8][9][10][11]. These computational fluid dynamics (CFD) tools can, therefore, be applied for modeling heavily loaded hard-chine hulls in the entire speed range.…”

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confidence: 99%

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Numerical Study of Hydrodynamics of Heavily Loaded Hard-Chine Hulls in Calm Water

Wheeler

Matveev

Xing

2021

JMSE

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Hard-chine boats are usually intended for high-speed regimes where they operate in the planing mode. These boats are often designed to be relatively light, but there are special applications that may occasionally require fast boats to be heavily loaded. In this study, steady-state hydrodynamic performance of nominal-weight and overloaded hard-chine hulls in calm water is investigated with computational fluid dynamics solver program STAR-CCM+. The resistance and attitude values of a constant-deadrise reference hull and its modifications with more pronounced bows of concave and convex shapes are obtained from numerical simulations. On average, 40% heavier hulls showed about 30% larger drag over the speed range from the displacement to planing modes. Among the studied configurations, the hull with a concave bow is found to have 5–12% lower resistance than the other hulls in the semi-displacement regime and heavy loadings and 2–10% lower drag in the displacement regime and nominal loading, while this hull is also capable of achieving fast planing speeds at the nominal weight with typical available thrust. The near-hull wave patterns and hull pressure distributions for selected conditions are presented and discussed as well.

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Section: Computational Approachmentioning

confidence: 99%

mentioning

confidence: 99%

Numerical Study of Hydrodynamics of Heavily Loaded Hard-Chine Hulls in Calm Water

Wheeler

Matveev

Xing

2021

JMSE

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“…The pioneering work by Savitsky (1964) is still reliably used for estimating calm water resistance on empirical basis based on model tests of prismatic planing hulls. Fridsma (1969) carried out experimental investigations on the characteristic Fridsma hull form, which is still used as a benchmark model for verification and validation studies (Sukas et al 2017). Ikeda (1993) studied a series of hard chine hulls with the range of the length-to-beam ratio from 3 to 6.…”

Section: Article Highlightsmentioning

confidence: 99%

“…Lotfi et al (2015) carried out numerical investigation of high-speed stepped planing hull by volume of fluid (VOF) approach to present the volume fraction contours at different transverse sections besides the other dynamic characteristics. Considering experimental data as the basis (Sukas et al 2017) achieved less error for simulations performed on the Fridsma hull form using overset grids (also known as chimera or overlapping grids) compared with single grid for high Froude numbers. Mousaviraad et al (2015) assessed the capability of unsteady Reynolds-averaged Navier-Stokesbased CFD Ship-Iowa solvers for hydrodynamic performance and slamming for high-speed planing vessels with validation and verification (V&V) studies performed using benchmark data of Fridsma.…”

Section: Article Highlightsmentioning

confidence: 99%

Simulation of Air–Water Interface Effects for High-speed Planing Hull

Nimmagadda

Polisetty

Iyer

2020

J. Marine. Sci. Appl.

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High-speed planing crafts have successfully evolved through developments in the last several decades. Classical approaches such as inviscid potential flow–based methods and the empirically based Savitsky method provide general understanding for practical design. However, sometimes such analyses suffer inaccuracies since the air–water interface effects, especially in the transition phase, are not fully accounted for. Hence, understanding the behaviour at the transition speed is of fundamental importance for the designer. The fluid forces in planing hulls are dominated by phenomena such as flow separation at various discontinuities viz., knuckles, chines and transom, with resultant spray generation. In such cases, the application of potential theory at high speeds introduces limitations. This paper investigates the simulation of modelling of the pre-planing behaviour with a view to capturing the air–water interface effects, with validations through experiments to compare the drag, dynamic trim and wetted surface area. The paper also brings out the merits of gridding strategies to obtain reliable results especially with regard to spray generation due to the air–water interface effects. The verification and validation studies serve to authenticate the use of the multi-gridding strategies on the basis of comparisons with simulations using model tests. It emerges from the study that overset/chimera grids give better results compared with single unstructured hexahedral grids. Two overset methods are investigated to obtain reliable estimation of the dynamic trim and drag, and their ability to capture the spray resulting from the air–water interaction. The results demonstrate very close simulation of the actual flow kinematics at steady-speed conditions in terms of spray at the air–water interface, drag at the pre-planing and full planing range and dynamic trim angles.

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“…This coefficient is used to characterize the total resistance and to compare the performance of the different hulls. Wave drag or wave resistance may be expressed in the dimensionless ratio of the Froude number [110]. When the vessel is operating on a calm water surface, the drag is defined as:…”

Section: Vessel Resistancementioning

confidence: 99%

Battery Powered RC Boats: A Review of Its Developments for Various Applications

Eugene

Lim

Nirmal

et al. 2019

CJAST

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This paper presents a review of the developments in the battery powered remote control (RC) boat for various applications. In recent time, RC boat stands no more a mere toy or instrument that is solely used for a hobby. Various researches into the applications of RC boats have been undertaken in recent years and its performance has been a continuous growing concern for society. Many researchers have also exerted strenuous efforts into modifying the shapes and materials that are used to manufacture the boat hull, in order to improve its efficiency. In lieu to this, this paper provides information on different types of boat hulls and their characteristics. Knowing the fact that the performance of the RC boat has been directly affected by its component parts such as the motor, ESC, rudder, propeller and others, the paper highlights an overview of the RC boat’s basic components and its setup. Owing to the review works presented, future research is proposed which may open new research pathways to the subject of interest.

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Hydrodynamic assessment of planing hulls using overset grids

Cited by 57 publications

References 12 publications

Numerical Study of Hydrodynamics of Heavily Loaded Hard-Chine Hulls in Calm Water

Numerical Study of Hydrodynamics of Heavily Loaded Hard-Chine Hulls in Calm Water

Simulation of Air–Water Interface Effects for High-speed Planing Hull

Battery Powered RC Boats: A Review of Its Developments for Various Applications

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