• A novel CFD-DEM numerical model with dynamic overset grid technology and DFBI method enables free-running ship motion in pack ice, overcoming limitations of stationary ship assumptions.
• The proposed high-precision pack ice generation method accurately represents pack ice conditions, enhancing the fidelity of ship-ice-water interaction simulations.
• Validation against model test data and experimental observations confirms the model's effectiveness in predicting ship resistance and simulating navigation in pack ice.
• The model offers significant potential for further studies on ship performance in pack ice, supporting design and optimization of ice-going ships.