A Study on Effective Braking Force Considered Ship-Tugboat Interaction

概要

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The reduction of the braking capability of tugboats under ship-tugboat hydrodynamic interaction was confirmed in the previous paper relying on scale model experiment results. The ship-tugboat hydrodynamic interaction was mainly caused by tugboat's propeller stream and wake of the assisted ship. Since the interference component of the ship-tugboat hydrodynamic interaction receives the influence of Reynolds number, the influence of scale effects on the effective braking force of tugboats under ship-tugboat hydrodynamic interaction has to be considered further. In this study. The effective braking force is approached by dividing ship-tugboat interaction into two interference components, namely on the tugboat's braking force in ship's wake and on ship's hull resistance. First, the interference component on the tugboat's braking force is predicted considering the scale effect of ship's wake velocity distribution, and using the braking force coefficient of tugboat-self in the uniform flow. Next, the interference component on ship's hull resistance is also estimated under an assumption, which this component in full scale ship is in proportion to Schlichting's frictional resistance as the component obtained in scale model experiments being a constant. Finally, the effective braking force for full scale tugboats was predicted by using the experiment data and the assumptions mentioned above.
社団法人日本航海学会の論文
2008-09-25