Vol 78 No 1 78101

Abstract

To elucidate the operational performance characteristics of polar ships navigating through brash ice areas, this study systematically investigates ship ice resistance and turning ability through an integrated approach combining CFD-DEM numerical simulations and model tests. The DFBI plane motion was employed to simulate the interaction between a polar ship and brash ice, the maximum deviation of ice resistance among the numerical simulation results, the FSICR formula, and the model test data is 15.87 %. Validating the reliability of the numerical model and methodology. The body force method and overset grid technology were employed to establish a turning ability simulation model, triangular, circular and square brash ice region environments are constructed. Analysis of key influencing factors reveals that, under constant brash ice concentration conditions, triangular brash ice shapes significantly increase both ice resistance and turning diameter. High sea ice Young’s modulus increases ice resistance and turning diameter, thus diminishes turning ability. The deceleration effect of polar ships under small rudder angle conditions is weaker than that under large rudder angle conditions, while the corresponding magnitudes of ice resistance and heave motion responses are higher. This research provides a methodological reference for the investigation of ship’s turning ability.