Coupled Lattice Boltzmann and Discrete Element Simulations of Ship-Ice Interactions

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  • Watanabe, Seiya
    Research Institute for Applied Mechanics, Kyushu University
  • Hu, Changhong
    Research Institute for Applied Mechanics, Kyushu University
  • Aoki, Takayuki
    Global Scientific Information and Computing Center, Tokyo Institute of Technology

Bibliographic Information

Published
2023-08-09
Resource Type
conference paper
Rights Information
  • Creative Commons Attribution 3.0 Unported
DOI
  • 10.1088/1757-899x/1288/1/012015
Publisher
IOP Publishing

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Evaluating ice loads acting on ships is essential for the safety of ships navigating in ice-covered seas. In this study, we develop a CFD method to handle ship, ice, and fluid interaction. The lattice Boltzmann method, capable of large-scale calculations, is applied to the simulation of free-surface fluids. The ice motion is computed by solving the equations of motion of a rigid body, and the discrete element method models the ice-ice and ice-ship contact interactions. A momentum exchange scheme couples the lattice Boltzmann method and particle-based rigid body simulation. We introduce tree-based adaptive mesh refinement and multiple GPU computing to improve grid resolution and computational time. The proposed method is applied to model scale simulations of ship navigation in a brash ice channel. Simulations were performed for various conditions with different ice concentrations and ship velocities, and we observed that ice resistance increased with the ice concentration and the ship velocity increased. The ice motions and resistances obtained from our simulations are reasonable compared to model equations of Finnish-Swedish ice class rules (FSICR) and numerical analyses of a previous study.

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