Numerical Simulation of Moored Ship in Level Ice

2011 ◽  
Author(s):  
Li Zhou ◽  
Biao Su ◽  
Kaj Riska ◽  
Torgeir Moan
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Relative Motion ◽  
Parameter Sensitivity ◽  
Two Dimensional ◽  
Ice Drift ◽  
Sensitivity Studies ◽  
Level Ice ◽  
Ice Forces ◽  
Ice Resistance

The dynamic ice forces on a moored icebreaking tanker induced by drifting level ice were simulated with a two dimensional numerical model. Based on a heading controller which aimed to keep the hull head towards the drifting ice, ice resistance on ship was mainly estimated when taking the relative motion between the hull and ice into account. The mooring force and responses of the moored vessel were also looked into through parameter sensitivity studies with different ice thicknesses and ice drift speeds.

scholarly journals An Approach to Determine Optimal Bow Configuration of Polar Ships under Combined Ice and Calm-Water Conditions

2021 ◽  
Vol 9 (6) ◽  
pp. 680
Author(s):  
Hui Li ◽  
Yan Feng ◽  
Muk Chen Ong ◽  
Xin Zhao ◽  
Li Zhou
Keyword(s):  
Numerical Simulation ◽  
Water Resistance ◽  
Numerical Technique ◽  
Experimental Studies ◽  
Resistance Index ◽  
Simulation Method ◽  
Present Approach ◽  
Calm Water ◽  
Level Ice ◽  
Ice Resistance

Selecting an optimal bow configuration is critical to the preliminary design of polar ships. This paper proposes an approach to determine the optimal bow of polar ships based on present numerical simulation and available published experimental studies. Unlike conventional methods, the present approach integrates both ice resistance and calm-water resistance with the navigating time. A numerical simulation method of an icebreaking vessel going straight ahead in level ice is developed using SPH (smoothed particle hydrodynamics) numerical technique of LS-DYNA. The present numerical results for the ice resistance in level ice are in satisfactory agreement with the available published experimental data. The bow configurations with superior icebreaking capability are obtained by analyzing the sensitivities due to the buttock angle γ, the frame angle β and the waterline angle α. The calm-water resistance is calculated using FVM (finite volume method). Finally, an overall resistance index devised from the ship resistance in ice/water weighted by their corresponding weighted navigation time is proposed. The present approach can be used for evaluating the integrated resistance performance of the polar ships operating in both a water route and ice route.

scholarly journals NUMERICAL SIMULATION OF 1964 TSUNAMI ACROSS THE PACIFIC OCEAN

1986 ◽  
Vol 1 (20) ◽  
pp. 5
Author(s):  
Michael H. Chen
Keyword(s):  
Numerical Simulation ◽  
Boundary Condition ◽  
Numerical Model ◽  
Pacific Ocean ◽  
Arrival Time ◽  
Two Dimensional ◽  
Open Sea ◽  
The Pacific ◽  
The Pacific Ocean

A two dimensional numerical longwave model using an appropriate open sea boundary condition has been developed. The use of the open-sea boundary condition makes it possible to simulate longwave propagation using a smaller region without covering the entire ocean. The numerical model is used to predict the arrival time of tsunamis resulting from the 1964 Alaskan earthquake at various stations with reasonable success.

Ice Tank Testing of a Surface Buoy for Arctic Conditions

2008 ◽  
Author(s):  
Oddgeir Dalane ◽  
Ove Tobias Gudmestad ◽  
Sveinung Lo̸set ◽  
Jo̸rgen Amdahl ◽  
Tor Erik Hilde`n ◽  
...  
Keyword(s):  
Test Results ◽  
Floating Structures ◽  
Deep Waters ◽  
Ice Drift ◽  
Arctic Conditions ◽  
Ice Conditions ◽  
Level Ice ◽  
Ridged Ice ◽  
Ice Forces ◽  
Multiyear Ice

A moored Shallow Draught Buoy (SDB) for potential operations in Arctic waters was tested during the summer of 2006 in the model laboratory basin at the Hamburg Ship Model Basin (HSVA) in Hamburg. The conceptual design of this buoy was based on the design of the Kulluk exploration vessel which operated in the Beaufort Sea in the 1980’s and early 1990’s. The concept was tested in ice conditions representing level ice, multiyear ice and ridged ice, where the ice thickness, ice drift velocity and flexural strength were varied in the different test runs. Moored structures are believed to be favourable in deep waters with ice present, but there exist insufficient information and data about the actions on and behaviour of moored floating structures in ice to support this. The purpose of the present paper is to evaluate the model test results and look at the dynamic ice loading and response of the structure. The ice forces on the structure were calculated from the structure’s response and response power density spectra were used to evaluate the periodic forces and displacements. Based on the analysis of the test data, an increased understanding of the behaviour of the surface buoy is presented.

scholarly journals Numerical Simulation of a Polar Ship Moving in Level Ice Based on a One-Way Coupling Method

2020 ◽  
Vol 8 (9) ◽  
pp. 692
Author(s):  
Bao-Yu Ni ◽  
Zi-Wang Chen ◽  
Kai Zhong ◽  
Xin-Ang Li ◽  
Yan-Zhuo Xue
Keyword(s):  
Numerical Simulation ◽  
Failure Process ◽  
Coupling Method ◽  
Crack Propagation Process ◽  
Order Of Magnitude ◽  
Level Ice ◽  
Ice Failure ◽  
Ice Resistance ◽  
Ship Speed ◽  
Good Agreement

In most previous ice–ship interaction studies involving fluid effects, ice was taken as unbreakable. Building breakable level ice on water domain is still a big challenge in numerical simulation. This paper overcomes this difficulty and presents a numerical modeling of a ship moving in level ice on the water by using a one-way CFD-DEM (computational fluid dynamics-discrete element method) coupling method. The detailed numerical processes and techniques are introduced. The ice crack propagation process including radial and circular cracks have been observed. Numerical results are compared with previous experimental data and good agreement has been achieved. The results show that water resistance is an order of magnitude smaller than ice resistance during the ice-breaking process. Ice resistance shows strong oscillation along with ice failure process, which are affected by ship speed and ice thickness significantly.

Finite Element Numerical Simulation of Two-Dimensional Ground Water Solute Migration Question

2011 ◽  
Vol 301-303 ◽  
pp. 352-356 ◽  
Author(s):  
Meng Ling Zhao
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Model ◽  
Solute Transport ◽  
Ground Water ◽  
Calculated Result ◽  
Two Dimensional ◽  
Finite Element Numerical Simulation ◽  
Good Agreement

The finite element numerical model of 2-D solute transport in ground water with variable was established under the condition of variety of the velocity of the movement of water is not too fast,and was carried on by the finite element numerical simulation method.the numerical simulation shows that the calculated result is in good agreement with the experiment result.

A Research on the Characteristics of Lightning in Hailstorms of Beijing Area by the Method of Analysis the Lightning Detection Data and Numerical Simulation

2013 ◽  
Vol 416-417 ◽  
pp. 1993-1996
Author(s):  
Chuang Chuang Zhang ◽  
Ming Ma
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Two Dimensional ◽  
Beijing Area ◽  
Variation Trend ◽  
Lightning Detection ◽  
The Mean ◽  
Total Lightning ◽  
The Relationship ◽  
Cg Lightning

In this paper, by using lightning detection material of Beijing area, we analyzing the characteristics of lightning in four hailstorms. The results show that the mean percentage of cloud-to-ground (CG) lightning accounting for the total lightning is 8.28%, which is lower than the normal thunderstorms. On the contrary, the CG lightning has a higher proportion of positive CG than the normal thunderstorms. All cases variation trend of lightning frequency show a conspicuous intensive increase before the hail reaches the ground. The peak lightning frequency usually occurs 5 to 80min earlier than hailstone falling. These characteristics may have contribution to the forecasting of hailstorms of Beijing area. Another work was done by using a two-dimensional numerical model which includes dynamic, microphysics, electrification and discharge to simulate these four instances. The results present similar characteristics with the actual detection data. This will lay a foundation for the continuing studies of the relationship between hailstorm and lightning and the inherent reason of the relationship by using the method of numerical simulation.

scholarly journals Sand Bar Evolution Process Numerical Simulation Analyze Based on two Dimensional Numerical Model

2021 ◽  
Vol 1885 (5) ◽  
pp. 052047
Author(s):  
Caodong Jiang ◽  
Liangchao Ma ◽  
Dongfeng Li ◽  
Hongwu Zhang ◽  
Zihao Li
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Evolution Process ◽  
Two Dimensional ◽  
Sand Bar
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