Numerical investigation of the components of calm-water resistance of a surface-effect ship

Maki, Kevin J.; Broglia, Riccardo; Doctors, Lawrence J.; Mascio, Andrea Di

doi:10.1016/j.oceaneng.2013.07.022

Cited by 10 publications

(6 citation statements)

References 9 publications

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“…The index C shows the center of mass of the body, m is mass of the body, v c the velocity vector, M c is the tensor of the moments of inertia, w c is the angular velocity vector and m c represents the resultant moment vector acting on the body (Maki, Broglia, Doctors, & Di Mascio, 2013).…”

Section: Body Motion Equationmentioning

confidence: 99%

CFD Analysis on Vertical Motion of a Full-Scale Floating Jetty

Fitriadhy¹,

ADAM²

2020

J. Sustain. Sci. Manage.

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A floating jetty often experiences several vertical motions i.e., heave and pitch motion responses due to harsh environmental condition. This inherently makes discomfort to everyone during berthing on a floating; and even it potentially leads to loss of life due to falling down into the sea. A preliminary analysis using Computational Fluid Dynamics (CFD) simulation is necessary to be conducted to ensure user’s safety. The CFD analysis focused on the interaction between wave motions and the floating jetty and its effects on the vertical motions. The vertical motions of floating jetty were quantified by the Response Amplitude Operators (RAO). Several effects due to variation of wavelength (λ/L) have been studied. The CFD results revealed that the lower wavelength (λ/L<2.25) resulted in the increase of the heave and pitch motion amplitudes proportionally. However, the subsequent increase of wavelength (2.25>λ/L) has given results to less heave and pitch motion amplitudes. In general, it is shown that the vertical motion characteristics of the floating jetty predominantly depend on wave properties.

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Section: Body Motion Equationmentioning

confidence: 99%

CFD Analysis on Vertical Motion of a Full-Scale Floating Jetty

Fitriadhy¹,

ADAM²

2020

J. Sustain. Sci. Manage.

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“…Once the total drag force has been obtained, the frictional and pressure resistance components can be calculated. The RANS method calculates the hydrodynamic drag using an integral over the wetted surface [26]. The frictional, pressure and total resistance coefficients are calculated as follows [19]:…”

Section: Resistance Component Analysismentioning

confidence: 99%

Experimental and Numerical Model Investigations of the Underwater Towing of a Subsea Module

Zan

Guo

Yuan

et al. 2019

JMSE

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In underwater towing operations, the drag force and vertical offset angle of towropes are important considerations when choosing and setting up towing equipment. The aim of this paper is to study the variation in drag force, vertical offset angle, resistance, and attitude for towing operations with a view to optimizing these operations. An underwater experiment was conducted using a 1:8 scale physical model of a subsea module. A comprehensive series of viscous Computational Fluid Dynamics (CFD) simulations were carried out based on Reynolds-averaged Navier–Stokes equations for uniform velocity towing. The results of the simulation were compared with experimental data and showed good agreement. Numerical results of the vorticity field and streamlines at the towing speeds were presented to analyze the distribution of vortexes and flow patterns. The resistance components were analyzed based on the numerical result. It was found that the lateral direction was a better direction for towing operations because of the smaller drag force, resistance, and offset angle. Similar patterns and locations of streamlines and vortexes were present in both the longitudinal and lateral directions, the total resistance coefficient decreases at a Reynolds number greater than that of a cylinder.

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“…The index C denotes the centre of mass of the body, m denotes the mass of the body, the velocity vector, is the tensor of the moments of inertia, ⃑ ⃑ is the angular velocity vector, denotes the resulting force vector and ⃑⃑ denotes the resultant moment vector acting on the body [12]. The resultant force has three components; surface force, field forces and external forces:…”

Section: Body Motion Equationmentioning

confidence: 99%

“…Nonaka et al [7] determine the fluid motion around the hull of a vessel and the hydrodynamics force exerted on a drifting vessel as well as presence of strong nonlinearities and complex flowfield [7]. CFD approach had been widely applied in maritime technology field such as estimating the vessel performance [8][9][10], resistance [11][12][13][14][15], and ship motions characteristics [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Heave and Pitch Motion Performances of a Ship Towing System Incorporated with Symmetrical Bridle Towline Model

Fitriadhy

Aldin

Mansor

et al. 2019

EPI-IJE

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An investigation on vertical motion characteristics of a ship towing system incorporated with symmetrical bridle towline configuration set a real challenge for the naval architect engineer. This paper presents a Computational Fluid Dynamic (CFD) approach to analyse heave and pitch motion performances in waves. Several towing parameters such as various towline length and towing’s velocity have been taken into account. Here, 1B (barge) is employed in the simulation; and designated as a towed ship. The results revealed that the subsequent increase of the towline lengths has been basically proportional with the increase of her heave motion; while inversely decrease in pitch motions. In addition, the effect of the extending towline length = 1.0 to 3.0 resulted in insignificant effect to the towline tension. However, the increase of the towing’s velocity from 0.509 m/s to 0.728 m/s has led to significantly increase her heave motion and the towline tension by 40.46% and 24%, respectively; meanwhile, the pitch motion barge has sufficiently decreased by 35.94%. This simulation has been beneficial for the towing operator to ensure a higher level of the safety navigation of ship towing system.

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Numerical investigation of the components of calm-water resistance of a surface-effect ship

Cited by 10 publications

References 9 publications

CFD Analysis on Vertical Motion of a Full-Scale Floating Jetty

CFD Analysis on Vertical Motion of a Full-Scale Floating Jetty

Experimental and Numerical Model Investigations of the Underwater Towing of a Subsea Module

Heave and Pitch Motion Performances of a Ship Towing System Incorporated with Symmetrical Bridle Towline Model

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