Journal ArticleDOI
On the piston and sloshing modes in moonpools
Reads0
Chats0
TLDR
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
More filters
Journal ArticleDOI
On natural modes in moonpools and gaps in finite depth
TL;DR: In this paper, an extension of the theoretical model of Molin (J.M. 2001, vol. 430, pp.27-50) is proposed, where the assumptions of infinite depth and infinite horizontal extent of the support are released.
Book ChapterDOI
Liquid Sloshing Dynamics: Fluid field equations and modal analysis in rigid containers
TL;DR: In this paper, the Dirichlet boundary conditions are classified into three classes: Neumann boundary conditions, Cauchy boundary conditions and Cauchey boundary conditions for a partially filled container.
Journal ArticleDOI
Damping of liquid sloshing by foams
Alban Sauret,Alban Sauret,François Boulogne,Jean Cappello,Emilie Dressaire,Emilie Dressaire,Howard A. Stone +6 more
TL;DR: In this article, the influence of the foam on the sloshing dynamics is experimentally characterized: only a few layers of bubbles are sufficient to significantly damp the oscillations of the free surface of the liquid.
Journal ArticleDOI
Experimental study of the wave propagation and decay in a channel through a rigid ice-sheet
TL;DR: In this article, experiments were carried out in a wave flume, to study wave propagation in a narrow channel along a barge-like structure, attached to one of the side-walls.
Journal ArticleDOI
Numerical investigation of viscous effects on the gap resonance between side-by-side barges
TL;DR: In this article, the gap resonance between two side-by-side barges by using a multiphase Navier-Stokes equations model is analyzed. But the authors focus on the effect of incident wave steepness on the viscous damping associated with the twin-barge system.
References
More filters
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.