18th International Symposium on Ice, August 28 - September 1, 2006, Sapporo, Japan
numerical simulation; bergy bit collision; CCGS Terry Fox icebreaker
Numerical simulations of a collision between the CCGS Terry Fox icebreaker and a bergy bit (1911 t glacial ice mass) have been conducted using LS-DynaTM software, which incorporates a full Navier-Stokes solver for the fluid component. First results compared favorably with actual data acquired during field tests in June, 2001. The simulations were run on a Beowulf cluster consisting of 15 high-performance CPU's. The modeled volume, including the vessel, water and bergy bit, was meshed using AnsysTM software and contained approximately one million elements. A prior set of non-impact simulations of a model tanker transiting in proximity to model bergy bits showed that at least this number of elements was required. In the results presented here the vessel was traveling at 5 m/s and the impact occurred on the port side of the hull, in the region where the instruments were located during the field tests. A hard crushable foam material model was used for the bergy bit in order to model previously observed ice behavior where the ice contact interface consists of a relatively intact hard zone of ice surrounded by softer pulverized ice. The simulation produced reasonable values for the load, pressure and impact duration values obtained in the field.
International Association for Hydraulic Engineering and Research
18th International Symposium on Ice [Proceedings] (2006).