Investigating the dynamic performance and added resistance of a full scale ship in different wave angles and loading conditions using the strip theory method

Nowadays, comprehensive research is done on the hydrodynamic analysis of oil tankers to reduce their resistance. Most of these studies have focused on drag reduction in calm water and design conditions, and have rarely evaluated the ship's behavior under real operational conditions at sea. For this reason, in the current paper, using a practical and effective method, the dynamic behavior of an oil tanker has been studied in real conditions. To this accomplishment, the KVLCC2 tanker was selected, its resistance in calm water, dynamic behavior, and added resistance in the wavy condition were measured and the results obtained were compared with the experimental database. The numerical simulation shows the acceptable accuracy of the present method compared to the experimental results. After ensuring the accuracy of the results, a wide range of ship working conditions and exposure to waves, as well as different loading conditions have been studied. Based on the obtained results, it can be seen that the strip theory method is more accurate in estimating the added resistance of such a vessel compared to predicting its dynamic behavior. Also, the angle of impact of the waves on the vessel does not have a significant effect on the maximum range of the vertical displacement. In addition, the maximum added resistance at all wave impact angles is directly proportional to the ship draft.