Author(s): Junji Sawamura; Hiroyuki Tsuchiya; Takashi Tachibana; Naoki Osawa
Linked Author(s):
Keywords: No Keywords
Abstract: The numerical method to calculate the ice load of the ship maneuvering in the level ice is presented. In the previous study, we proposed the numerical model to simulate the repetitive ship-ice interaction in a level ice to calculate the ice force and the ice breaking channel for ship advancing into the level ice in head-on drift direction with the constant ship speed. This paper presents the ship turning maneuver in level ice. In the simulations, the ship is maneuvered the constant turning radii and the constant ship velocity. Moreover, the 3 degree of freedom (3DOF) rigid body equation is applied to describe the surge, sway and yaw of the ship motion. The contact position between the ship-hull and the ice-edge is determined by the circle contact detection algorithm. In order to estimate the ice load, the bending failure of the floating ice plate is focused on. The buoyancy force, the turning and sliding component in the ice load induced by the broken ice pieces during ice breaking process are neglected. The ice breaking force includes the dynamic effect of the ice-water interaction calculated by the FE fluid-structural interaction. The crack pattern of the broken cusp is assumed to be the circular arc. The predicted ice resistance neglected the component of the broken ice pieces are compared with the model test data to verify the developed model. The turning maneuvering with the 3DOF ship motion is preliminarily simulated.
Year: 2010