Analysis of Overtaking Manoeuvres in a Narrow Waterway

Hamburg-Harburg, TU; Conrad, Frank; Potsdam, Sva

doi:10.1179/str.2005.52.4.005

Cited by 15 publications

(10 citation statements)

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“…[3], a series of steady calcula tions for various relative positions is conducted, neglecting the time dependency. The forward speed cor responds to Froude numbers of 0.152 and 0.245 for the large and small ship, respectively.…”

Section: Test Cases and Resultsmentioning

confidence: 99%

“…Soding and Conrad [3] show that free surface effects are important for overtaking of a smaller ship by a larger one: the former was captured by the depression of the free surface produced by the second and lost its steering abil ity, which led to a collision. Note that the pressure distribution on the hull is also influenced by lift on the hull produced by flow separation, which is especially important for the lateral force [3]. The authors ascribe these differences to the free surface de formation between the ships.…”

Section: Introductionmentioning

confidence: 99%

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Rankine Source Method for Ship–Ship Interaction Problems

Graefe

Shigunov

Moctar

2015

Journal of Offshore Mechanics and Arctic Engineering

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A Rankine source method is extended and applied to ship-ship interaction problems. The method covers the nonlinear steady flow and linear seakeeping in the frequency domain. The nonlinear steady flow solution accounts fo r the nonlinear free-surface conditions, ship wave, and dynamic trim and sinkage. Periodic flow due to waves is linearized with respect to the wave amplitude, taking into account interactions with the nonlinear steady flow following Hachmann approach, which considers the steady perturbation potential as constant in the body-fixed reference frame. This is advantageous fo r the prediction o f ship motions at moderate to high Froude numbers. In this context, a new formulation o f the boundary condition fo r the multibody case is derived. Two examples are considered, overtaking in calm water and replenishment at sea. For a feeder vessel overtaken by a container ship, horizontal forces and yaw moment are computed and compared with ref erence data. As an example o f replenishment operation, interaction between a frigate and a supply vessel is studied. Ship motions are computed fo r two relative positions and three forward speeds and compared with model test data fo r the largest forward speed. The Rankine source method proves as more accurate compared with a zero-speed freesurface Green function method.

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Section: Test Cases and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rankine Source Method for Ship–Ship Interaction Problems

Graefe

Shigunov

Moctar

2015

Journal of Offshore Mechanics and Arctic Engineering

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“…In the present computational study, the free-surface mesh is divided into two patches along the centreline between hulls and move with the corresponding hulls at the same forward speed, as shown in figure 2. The two independent free-surface patches cover a sufficiently large area of interests [41] and the free-surface elevation is constant within each panel; therefore, neither the alignment of patches nor the re-meshing of the entire domain is required in the time-marching, which makes mesh generation much easier. In addition, the two hulls in the computational study maintain constant sinkage and trim, that the relative distance between any two panels within the same patch is kept constant throughout the entire simulation.…”

Section: (B) Time-marching By Moving-patch Methodsmentioning

confidence: 99%

Experimental and numerical study of ship-to-ship interactions in overtaking manoeuvres

Yu¹,

Wang²,

Yeung³

2019

Proc. R. Soc. A.

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The study on close-quarter manoeuvring of vessels is of great importance for the safety and efficiency of maritime operations. In this paper, the hydrodynamic interactions between two vessels in moderate-speed overtaking manoeuvres are studied. Computational investigation by free-surface panel method is performed, and the results are assessed against experimental measurements from towing-tank model tests. The influences of overtaking speed and the speed difference between vessels on the hydrodynamic loads are studied. It is found that the free-surface deformation, on account of the blockage effects of the bodies, wave-making properties of the vessels, and the interference of unsteady wave patterns between the vessels, considerably affects the hydrodynamic interactions. In addition, it is also discovered that the influence from the unsteady heave and pitch motions of the hulls on the hydrodynamic loads can be non-negligible. Furthermore, it is found that the slower vessel to be overtaken generally experiences larger loads with more variation than the overtaking vessel. The loads on both vessels become more similar to those of a steady-state di-hull system when the speed difference between vessels is small.

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“…It is determined by the non-linear Rankine source method contained in the program GLRankine. The main features of this method are described in reference [7].…”

Section: Determination Of Flow Potentialsmentioning

confidence: 99%

Computation of springing transfer functions

Söding

2009

Proceedings of the Institution of Mechanical Engineers, Part M:

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Ship vibrations excited continually by regular waves are predicted by a potential method. It takes into account the interaction of the oscillatory flow with the steady flow due to the ship's forward speed, including steady ship waves and squat, but it excludes non-linear oscillatory wave forces. A three-dimensional Rankine source patch method is used both for the steady and the oscillatory flow. Vibration damping by an immersed transom, wave radiation, bilge keels, propeller, and hatch cover friction are approximated. Application to a large containership demonstrates that, in this example, damping is mostly attributable to the transom.

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Analysis of Overtaking Manoeuvres in a Narrow Waterway

Cited by 15 publications

References 0 publications

Rankine Source Method for Ship–Ship Interaction Problems

Rankine Source Method for Ship–Ship Interaction Problems

Experimental and numerical study of ship-to-ship interactions in overtaking manoeuvres

Computation of springing transfer functions

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