Numerical prediction of resistance for navigation ships in broken ice channel
TANG Xiangjie1,ZOU Ming1,2,ZOU Zaojian1,ZOU Lu1
1.Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;
2.Marine Design and Research Institute of China,Shanghai 200011,China
Abstract：The Arctic transport ships often navigate in brash ice channel created by icebreakers. Although this avoids the great ice resistance induced by the collision between the ship and level ice, the interaction between the ship and the brash ice in the channel is affected by the level ice on both sides of the ship, which further affects the navigation performance of the ship. At present, the influence of the level ice on both sides of brash ice channel on the ship performance has not yet been fully studied, and whether to consider this influence is an important issue for the design of Arctic ships. In this paper, the CFD-DEM (Computational Fluid Dynamics - Discrete Element Method) coupling method is used to simulate the navigation process of a ship in brash ice channel and to analyze the characteristics of ship-ice interaction, so as to numerically predict the ship resistance. The convergence study in terms of both mesh size and time step is conducted first to evaluate the numerical error and uncertainty, from which the reliability of the numerical model is verified. On this basis, the predictions results indicate that, due to the influence of the level ice on the ship-generated waves, the water resistance of the ship increases slightly with the decrease of channel width and the increase is mainly attributed to the pressure component; the ice resistance of the ship increases rapidly with the decrease of channel width, and the accumulation of brash ice on both sides of the ship is the main reason.
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