关键词: 浮冰块, SPH-DEM, 耦合动力学

Abstract: The shuttle boat that navigates in the polar seas will encounter ice floes, causing the hull of the shuttle boat to collide and ride these ice floes. In this case, the motion of the hull and the interaction between the hull and the ice floes are issues that demand attention. The SPH-DEM method is adopted to solve this problem, which involves the interaction between the wave and the floating bodies, and the interaction between these floating bodies. The smooth particle hydrodynamics (SPH) is used to solve the wave motion, the interaction between the wave and the hull and the interaction between the wave and the ice floe. And the discrete element method (DEM) is used to solve the interaction between the hull and the ice floe. The pitch, surge and heave response of the hull and the ice floe, and the interaction between the ship and the ice floe are then calculated for four conditions of 0 degree and 180 degree wave directions and two longitudinal centers of gravity in front of and behind the mid-ship section, respectively. The results show that the hull and the ice floe connect closely with relatively consistent motion response amplitude and frequency when the center of the gravity is in front of the mid-ship section. The interaction force between the hull and the ice floe is dominated by the vertical component, and the stable time-averaged values of the vertical components corresponding to 0 degree and 180 degree wave directions can reach to 44.6% and 88.9% of the hull weight, respectively. However, the hull and the ice floe are free-floating when the center of the gravity is behind the mid-ship section, with stable time-averaged values of the vertical components approximately close to zero.

Key words: ice floe, SPH-DEM, coupled dynamics