Journal ArticleDOI
Numerical and experimental study on varying cross-section of moonpool for a drill ship
P. Sivabalan,S. Surendran +1 more
Reads0
Chats0
TLDR
In this paper, an experimental and numerical study on a drill ship with different cut-out angles facing the head on side of incoming waves was conducted to estimate the free surface elevation inside the moonpool.Abstract:
The mass of water in the moonpool of a drill ship will be in linear, angular, and coupled motions influencing the moving ship. The water mass in the moonpool is subjected to sloshing and piston modes. These modes of movement of water mass sometimes lead to a larger quantity of green water on the weather deck causing downtime of the vessel in critical conditions. This paper discusses experimental and numerical study on moonpool with different cut-out angles facing the head on side of incoming waves. The study also aims at minimizing the water motion inside the moonpool under the response to the incident waves. It is concluded that the moonpool with cut-out angle configuration reduces the free surface elevation inside it in a considerable level. With the presence of moonpool on board ship, it is inferred that there is modification in damping, inertial and restoring components of loads and moments.read more
Citations
More filters
Journal ArticleDOI
An experimental investigation of reduction effect of damping devices in the rectangular moonpool
TL;DR: In this article, the authors investigated the fluid motion characteristic in the rectangular moonpool with a large aspect ratio, and the reduction effects of four damping devices, the positive grid of flaps, negative grid of fags, grid of baffles and vertical bulkhead, were investigated to reduce the adverse effects.
Journal ArticleDOI
Experimental and Numerical Study for Drillship Moonpool Gap Resonances in Stationary and Transit Conditions in Wave Flume
TL;DR: In this paper, an openfoam-based computational fluid dynamics (CFD) model was established to investigate drillship moonpool gap resonance in both stationary and transit conditions in a wave flume.
Journal ArticleDOI
Reducing bubble generation and sweepdown effect on a research vessel with a moonpool
TL;DR: In this article, the moonpool provides a relatively good working environment for sonar in a harsh marine environment, but at the same time, other acoustic de-noising vessels set moonpools for sonars installation.
Journal ArticleDOI
Numerical and experimental study on the influence of a moonpool on motion performance and stability of a drillship
TL;DR: In this article , the authors present numerical and experimental study on the influence of the configuration of a moonpool on the motion performance and stability of a drillship under the condition of a constant displacement.
Journal ArticleDOI
Research on Oscillating Characteristics of the Shear Layer on the Ship Bottom with a Moonpool under the Action of the Current and Wave
TL;DR: In this paper, the effects of the sonar and the moonpool shape on the frequency of the shear layer oscillation were studied experimentally under the action of the incident current and wave.
References
More filters
Ship motions and sea loads
TL;DR: In this paper, a new strip theory is presented for predicting heave, pitch, sway, roll, and yaw motions as well as wave-induced vertical and horizontal shear forces, bending moments, and torsional moments for a ship advancing at constant speed with arbitrary heading in regular waves.
Book
Dynamics of marine vehicles
TL;DR: In this article, the Dynamics of Marine Vehicles (DVMV) is discussed in the context of marine vehicle dynamics, including the dynamics of marine vehicles and their dynamics of propulsion.
Journal ArticleDOI
On the piston and sloshing modes in moonpools
TL;DR: 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.
Journal ArticleDOI
Behavior of Water in Vertical Well with Bottom Opening of Ship, and its Effects on Ship-Motion
TL;DR: In this article, the behavior of the water in the well, and its effects on the motion of the ship, when she is running, were investigated under two different sets of conditions, when the ship-model was fixed stationary in the stream, and when the model was towed.
Journal ArticleDOI
The water motions in a moonpool
TL;DR: In this paper, a mathematical model describing the relative water motions inside a moonpool was developed, while also model tests were carried out to obtain empiric results with respect to the damping mechanisms and motion behaviour.