Numerical Simulation of Moored Ship Motion Considering Harbor Resonance

2017 ◽  
pp. 1081-1110
Author(s):  
Moonsu Kwak
Keyword(s):  
Numerical Simulation ◽  
Ship Motion ◽  
Harbor Resonance

Numerical Simulation of Ship Collision and Validations With Experimental Results

2021 ◽  
Author(s):  
Xiangbiao Wang ◽  
Chun Bao Li ◽  
Ling Zhu
Keyword(s):  
Numerical Simulation ◽  
Model Test ◽  
Structural Damage ◽  
Added Mass ◽  
Ship Motion ◽  
Time Dependent ◽  
Structural Deformation ◽  
Structure Interaction ◽  
Ship Collision ◽  
Good Agreement

Abstract Ship collision accidents occur from time to time in recent years, and this would cause serious consequences such as casualties, environmental pollution, loss of cargo on board, damage to the ship and its equipment, etc. Therefore, it is of great significance to study the response of ship motion and the mechanism of structural damage during the collision. In this paper, model experiments and numerical simulation are used to study the ship-ship collision. Firstly, the Coupled Eulerian-Lagrangian (CEL) was used to simulate the fluid-structure interaction for predicting structural deformation and ship motion during the normal ship-ship collision. Meanwhile, a series of model tests were carried out to validate the numerical results. The validation presented that the CEL simulation was in good agreement with the model test. However, the CEL simulation could not present the characteristics the time-dependent added mass.

On the Effect of Water on Deck on Ship Motion

2002 ◽  
Author(s):  
Dimitris Spanos ◽  
Apostolos Papanikolaou ◽  
George Tzabiras
Keyword(s):  
Numerical Simulation ◽  
Satisfactory Agreement ◽  
Simulation Method ◽  
Interaction Force ◽  
Ship Motion ◽  
Simplified Model ◽  
Ship Motions ◽  
Efficient Simulation ◽  
Water On Deck ◽  
Present Simulation

The effect of trapped water on deck or the interior compartments of ships on ship motions is closely investigated by use of a non-linear numerical simulation method. The employed method enables the efficient simulation of the wave excited, coupled ship – trapped water motions and proves to be a very valuable tool for the assessment of the survivability of flooded ships in waves. A detailed study has been carried out to more carefully investigate the coupling effects between the ship and the floodwater mass that can be expressed through a resultant interaction force. This interaction force has been approximated both by a simplified model employed by the present simulation method and also by a more accurate CFD code and satisfactory agreement between the results of both approaches has been obtained.

scholarly journals A Study on Analysis of Moored Ship Motion Considering Harbor Resonance

2013 ◽  
Vol 33 (2) ◽  
pp. 595-608 ◽  
Author(s):  
Moon Su Kwak ◽  
Yong Ho Moon ◽  
Chong Kun Pyun
Keyword(s):  
Ship Motion ◽  
Harbor Resonance

Numerical simulation of coupling effect between ship motion and liquid sloshing under wave action

2015 ◽  
Vol 108 ◽  
pp. 140-154 ◽  
Author(s):  
Sheng-chao Jiang ◽  
Bin Teng ◽  
Wei Bai ◽  
Ying Gou
Keyword(s):  
Numerical Simulation ◽  
Coupling Effect ◽  
Wave Action ◽  
Ship Motion ◽  
Liquid Sloshing

scholarly journals A NUMERICAL SIMULATION OF THE MOORED CONTAINER SHIP MOVEMENTS INDUCED BY WIND

1986 ◽  
Vol 1 (20) ◽  
pp. 201
Author(s):  
T.Z. Cheng ◽  
N.K. Liang
Keyword(s):  
Numerical Simulation ◽  
Wind Direction ◽  
Ship Motion ◽  
Container Ship ◽  
Prevailing Wind ◽  
Mooring Lines ◽  
Constant Frequency ◽  
The Past ◽  
Prevailing Wind Direction ◽  
Wind Frequency

In the past, only the ship motion due to wave is studied. This study is focused on the ship motion induced by a steady oscillating wind. The oscillating wind is assumed to be sinusoidal of a constant frequency. The wind direction 9, number of mooring lines and the wind frequency are the parameters in simulating an Evergreen's Ever Garden class container ship. The results show that the worst angle between the quay and the prevailing wind direction is 45°. Surge and roll are the most significant motions induced by the oscillating wind. By changing the number of mooring lines, the natural frequency can be kept away from the dominant wind frequency, except roll.

3-Dimensional Numerical Simulation of Ship Motion in Pack Ice

2012 ◽  
Author(s):  
Dexin Zhan ◽  
David Molyneux
Keyword(s):  
Numerical Simulation ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Ship Motion ◽  
Ship Motions ◽  
Discrete Element Modeling ◽  
Ship Maneuvering ◽  
3 Dimensional ◽  
Pack Ice ◽  
Ice Concentration

In OMAE2010, the authors presented a two dimensional numerical simulation for predicting ship maneuvering in pack ice. This paper is an expansion of this analysis to include a three dimensional numerical simulation for an arctic drill ship moving in pack ice (with ice concentration up to 90%) using a discrete element modeling program (DECICE3D) combined with a ship maneuvering code (SML). The mathematical models of ship motion, ice motion and ship-ice interaction are introduced in the paper. Ship motions of steady drift angle, turning about a turret, turning circle and zigzag maneuvers in pack ice are simulated. The results of the simulations are compared with experimental data or results of simulations for ice free conditions. A sensitive study for the effects of the mass damping term used in the equations of motion is conducted.

scholarly journals COMPUTER SIMULATION OF MOORED SHIP MOTION INDUCED BY HARBOR RESONANCE IN POHANG NEW HARBOR

2012 ◽  
Vol 1 (33) ◽  
pp. 68 ◽  
Author(s):  
Moonsu Kwak ◽  
Yongho Moon ◽  
Chongkun Pyun
Keyword(s):  
Wave Field ◽  
Field Data ◽  
Three Dimensional ◽  
Measurement Data ◽  
Ship Motion ◽  
Computational Method ◽  
Harbor Resonance ◽  
Record Data ◽  
Time Record ◽  
Heave Motion

This paper proposes a computational method for estimating moored ship motion taking into consideration harbor resonance, and provides a way to estimate the effect that harbor resonance has on moored ship motion. The computation of harbor resonance used the CGWAVE model, and the computation of moored ship motion used the three-dimensional Green’s function method. This method was verified with field motion measurement data from actual moored ships and wave field data and down time record data from Pohang New Harbor. The resonance periods obtained from wave field data in Pohang New Harbor were 80, 33, 23, and 8 min, which were the long waves, and 42, 54, and 60 s, which were the infra-gravity waves inside the harbor slip. The simulation results for harbor resonance were compared to the actual wave field data. This study investigated whether harbor resonance has an effect on moored ship motion using simulated results of ship motion both with and without harbor resonance included. In the case of harbor resonance included, moored ship motion increased by 10–30% when compared with the results without harbor resonance included. We found that harbor resonance has a greater effect on the surge and heave motion of a large-sized ship and on the roll and the yaw motion of a small-sized ship.

Study on Ship Motion under Internal Sloshing Impacts

2012 ◽  
Vol 490-495 ◽  
pp. 2853-2857
Author(s):  
Zhuo Bin Wei ◽  
Xian Wei Xiong ◽  
Ning Zhang
Keyword(s):  
Dynamical System ◽  
Numerical Simulation ◽  
Mechanical Model ◽  
Nonlinear Dynamical System ◽  
Ship Motion ◽  
Liquid Sloshing ◽  
Nonlinear Dynamical ◽  
Sway Motion

The purpose of this paper was to investigate the internal liquid sloshing and its effects on the ship motion. A mechanical model of ship motion under sloshing impacts is described. The lateral sloshing forces are included in the model. The nonlinear dynamical system is introduced to describe the sway motion of the ship. The results of the numerical simulation and the effects of the internal sloshing loads are analyzed. The feasibility of the approach is thus verified.

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