Author(s): Junji Sawamura
Linked Author(s):
Keywords: Sea Ice; Ships and Navigation in Ice
Abstract: Northern Sea Route (NSR) is new shipping route connects between Atlantic Europe and Pacific Ocean going through Arctic water. Vessel transits in NSR mostly navigate through the light ice conditions such as the small ice flows or brash ice channel. Ice performance in such ice condition is important to design of ice-going vessels. The numerical model to improve the ice resistance formula in which empirical parameters based on the onboard measurement are contained has been desired. The numerical model to evaluate ice resistance in the ice condition that many small ice floes interact with ship hull along the waterline or the bottom hull , however, have not be able to obtain the desirable results yet. In this paper, the numerical simulation and the model test to evaluate the ice resistance of ship in ice channel with small ice floes are presented. Numerical simulation adopts the physically based modeling with the contact detection technique to calculate the ship‐ice collisions. The ship‐ice interaction under waterline calculate using the simple model in which the buoyancy, friction and collision force induced by the ice floe calculate. The model test using synthetic ice was conducted in the towing tank. The ice force when the ship advances in the small ice floes was obtained. The ice resistance resulted from the simulations was compared with the model test and the empirical formulas. The numerical results agreed with the model tests and the empirical formulas. The numerical simulations with different ice concentration, the width of ice channel and the floe size are conducted. The numerical results showed that the ice resistance in small ice floes is strongly influenced by the ice concentration, but less by the width of ice channel and floe size.
Year: 2022