Numerical simulation for dynamic positioning in pack ice

Dai, Jie (2016) Numerical simulation for dynamic positioning in pack ice. Masters thesis, Memorial University of Newfoundland.

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This thesis investigates the numerical modelling of Dynamic Position (DP) in pack ice. A two-dimensional numerical model for ship-ice interaction was developed using the Discrete Element Method (DEM). A viscous-elastic ice rheology was adopted to model the dynamic behaviour of the ice floes. Both the ship-ice and the ice-ice contacts were considered in the interaction force. The environment forces and the hydrodynamic forces were calculated by empirical formulas. After the current position and external forces were calculated, a Proportional-Integral-Derivative (PID) control and thrust allocation algorithms were applied on the vessel to control its motion and heading. The numerical model was coded in Fortran 90 and validated by comparing computation results to published data. Validation work was first carried out for the ship-ice interaction calculation, and former researchers’ simulation and model test results were used for the comparison. With confidence in the interaction model, case studies were conducted to predict the DP capability of a sample Arctic DP vessel.

Item Type: Thesis (Masters)
Item ID: 11899
Additional Information: Includes bibliographical references (pages 81-92).
Keywords: Dynamic Positioning, pack ice, ship-ice interaction, ship control, thrust allocation, numerical simulation
Department(s): Engineering and Applied Science, Faculty of
Date: May 2016
Date Type: Submission
Library of Congress Subject Heading: Ice floes----Mathematical models; Ice mechanics----Mathematical models; Ice breaking operations--Mathematical models; Ships--Hydrodynamics--Mathematical models

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