Author(s): Joonmo Choung; Dong Ho Yoon
Linked Author(s):
Keywords: Sea Ice; Ice-Structure Interaction
Abstract: Objective of this paper is to investigate the effects of hydrodynamic forces composed of radiation and wave excitation on the ship motion and structural damage under the ship-to-iceberg impacts. A new code HydroQus that is the hydrodynamic subroutine for the Abaqus was used to simulate fluid-structure interactions (FSIs) between an icebreaker ARAON and spherical shape iceberg. Hydrodynamic frequency response analyses of the ARAON were conducted to obtain restoring stiffness, RAOs of radiation force and 1st order wave excitation force. Heave, roll, and pitch free-decay simulations using HydroQus were performed to check if the natural periods coincided with motion RAOs obtained from the frequency response analyses. Because there was a high agreement in the natural periods, some study cases for the ARAON-iceberg collision simulations were prepared according to the hydrodynamic effects and ship's elasticity-plasticity. The FSI simulation results revealed that the hydrodynamic forces had a large influence on the ship motion, while a negligible influence on the structural damages.
Year: 2022