Journal ArticleDOI
On the piston and sloshing modes in moonpools
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In this article, the authors considered rectangular moonpools of large horizontal dimensions and determined the natural modes of oscillation of the inner free surfaces under the assumption of infinite water depth and infinite length and beam of the barges that contain the moonpool.Abstract:
So-called ‘moonpools’ are vertical openings through the deck and hull of ships or barges, used for marine and offshore operations, such as pipe laying or recovery of divers. In the present study rectangular moonpools of large horizontal dimensions are considered. The natural modes of oscillation of the inner free surfaces are determined, under the assumption of infinite water depth and infinite length and beam of the barges that contain the moonpools. The problem is treated in two and three dimensions, via linearized potential flow theory. Results are given for the natural frequencies and the associated shapes of the free surface, for wide ranges of the geometric parameters. Simple quasi-analytical approximations are derived that yield the natural frequencies. The most striking result is that the natural frequencies of the longitudinal sloshing modes increase without bounds when both the draught and the width decrease to zero, the length of the moonpool being kept constant. As a corollary the problem of waves travelling in a channel through a rigid ice sheet is addressed and their dispersion equation is derived. The same behaviour is obtained: the waves travel increasingly faster as both the draught and the width of the channel are reduced.read more
Citations
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Hydrodynamic interactions between two ships travelling or stationary in shallow waters
TL;DR: In this article, a boundary element program based on 3-D Rankine source method was developed to investigate the ship-to-ship interaction problem, which considers both stationary and forward speed cases.
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Two-dimensional numerical study of gap resonance coupling with motions of floating body moored close to a bottom-mounted wall
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Semi-analytical solutions to wave diffraction of cylindrical structures with a moonpool with a restricted entrance
Xiaobo Chen,H. X. Liu,W. Y. Duan +2 more
TL;DR: In this article, the wave diffraction of cylindrical structures with a moonpool with a restricted entrance is studied using a semianalytical method based on eigenfunction matching.
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Current practice and research directions in hydrodynamics for FLNG-side-by-side offloading
Wenhua Zhao,Ian Milne,Mike Efthymiou,Mike Efthymiou,Hugh Wolgamot,Scott Draper,Paul H. Taylor,Paul H. Taylor,R. Eatock Taylor,R. Eatock Taylor +9 more
TL;DR: A review of the relevant hydrodynamics associated with side-by-side offloading is presented and recent developments have been reviewed and critiqued; these encompass numerical simulations, physical model tests and full scale measurements.
Journal ArticleDOI
Linear viscous damping in random wave excited gap resonance at laboratory scale — NewWave analysis and reciprocity
TL;DR: In this paper, the gap resonant response of the water free surface in narrow gaps between two side-by-side vessels in random waves is investigated with both large scale laboratory experiments and computationally with linear diffraction theory.
References
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Journal ArticleDOI
On the eigenvalue problem for fluid sloshing in a half-space
TL;DR: In this paper, the boundary value problem for free oscillations of a liquid in a half-space, which is bounded above by a rigid plane that contains a circular aperture, is transformed to a homogeneous, Fredholm integral equation for the velocity distribution in the aperture.
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Sloshing frequencies for a half-space with circular or strip-like aperture
TL;DR: In der vorliegenden Arbeit werden Naherungswerte (mit stengen Fehlerschranken) hergeleitet fur die Eigenfrequenzen der Schlingerbewegungen einer einen Halbraum with kreis- or streifenformiger Offnung aus fullenden idealen Flussigkeit as mentioned in this paper.
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A remark on the sloshing frequencies for a half-space
B. Andreas Troesch,R. Troesch +1 more
TL;DR: In this article, the known sloshing frequencies of an incompressible and inviscid fluid in a half-space with circular or strip-like aperture are investigated in some detail, based on previous results.
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Resonance interactions of waves in an ice channel
TL;DR: In this paper, it is shown that an ice channel is a waveguide for surface waves and the dispersive properties of the natural oscillations of the liquid in the channel are investigated.