Author(s): Akihisa Konno; Osamu Saitoh
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Abstract: Finnish-Swedish ice class rules requests resistance estimation of ship navigation in a brash ice channe l with a certain condition; channel width and thickness are specified in the rule. Some conditions such as channel length and size distribution of ice pieces are not specified in the rule, but will affect a ship resistance; investigation of effect of these parameters is required to develop a more exact evaluation method of resistance values with experiments or with calculations. We investigate effect of these conditions against ship resistance us ing a numerical estimation method we have deve loped on the basis of physica lly-based modeling. We also develop a method to place ice pieces randomly but not penetrating each other, and compare the resistance under irregular ice placements with that under regular placements. Results of the numerical simulations show that channe l length should be more than three times as long as that of the ship length, and that placement of ice pieces do not affect the ship resistance. Effect of existence of a wall at the further end of the channel for ship resistance is also discussed.
Year: 2010