Forces on ships transiting pressured ice covers

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Proceedings titleProceedings of the International Offshore and Polar Engineering Conference
Conference21st International Offshore and Polar Engineering Conference, ISOPE-2011, 19 June 2011 through 24 June 2011, Maui, HI
Pages10871092; # of pages: 6
SubjectCoastguards; Confining pressures; Conservation of mass; Constant velocities; Cut-off; Ice concentration; Ice conditions; Ice cover; Ice forces; Ice thickness; Ice-ship interaction; Lagrangian-Eulerian formulation; Linear momenta; Mohr coulomb criterion; Numerical models; Numerical solution; Plastic yield; Pressured ice; Ship transits; Simulation result; Total force; Vessel transit; Computer simulation; Constitutive equations; Meteorological problems; Ships; Ice
AbstractThe paper describes numerical simulations of ship transit through pressured ice conditions. The numerical model solves the equations of the conservation of mass and linear momentum together with constitutive equations representing plastic yield. That yield envelope is based on a cohesive Mohr-Coulomb criterion with a tension cut-off. The numerical solution employs a hybrid Lagrangian-Eulerian formulation. Pressured ice conditions are constructed by allowing a shear stress (e.g. representing wind drag) to compress an ice cover of initial uniform thickness against a straight land boundary. A ship is then introduced and moves parallel to the land boundary at constant velocity. The geometry of the Canadian Coast Guard vessel, CCGS Louis S. St- Laurent, is used in the tests. The results give the total force on the ship under a range of confining ice pressures. The distributions of ice concentration, thickness and pressures are also obtained. The simulation results show that both the velocity of the ship, and magnitude of confining pressure have significant effects on ice force. The results also examine the dependence of ice forces on ship velocity and ice thickness. Copyright © 2011 by the International Society of Offshore and Polar Engineers (ISOPE).
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); NRC Canadian Hydraulics Centre (CHC-CHC)
Peer reviewedYes
NPARC number21271191
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Record identifier9c93fc11-cade-416a-a207-dc12b2e17c37
Record created2014-03-24
Record modified2016-05-09
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