Modelling the Effect of Lateral Ice Pressure on Icebreaking Resistance

The effect of lateral ice pressure on the level ice resistance of a 1/30 scale model of an OBO is examined experimentally. The model was equipped with an instrumented side panel. The apparatus for producing lateral pressure is described, as well as the model tests themselves. Rubble thickness and applied pressure were varied during the experiments. A model is developed to describe the observed change in resistance. The model assumes that the resistance increase is due to ice-hull friction resulting from the ice pressure. The results from the instrumented panel suggest that approximately 2/3 of the applied pressure is seen at the hull. The study also found that the pressure only acts on the bow region and parallel middle body.